BMW 3 Series E46 M3 2001–2006 (S54) → Haltech Nexus S3 HT-213000 (auto)

BMW 3 Series E46 M3 2001–2006 (S54) — Haltech — Nexus S3

⚠ NOT CHECKED. Don't build from this.

Drawn by Michael Gnankou · Rev 0 · draft · 2026-10-08

Before you start

Status	draft · not yet verified: nobody has reported building and running this harness
Open errors	none
Size of the job	70 wires · 11 connectors · 1 part lines
Tools	Crimp and extraction tools for each terminal family (see Connectors) · wire strippers · multimeter · heat gun + heat-shrink
Order of work	1. Check every part against the parts list. 2. Cut and label every wire (labels: Export → Wire labels). 3. Crimp and pin connector by connector, ticking the build checklist. 4. Run the bench test with nothing plugged in and the battery disconnected. 5. Only then connect the ECU and power up.

Build checklist

Tick each box as you go. Continuity: meter from end to end, expect under 1 Ω.

Wire	From	To	Gauge	Cut	Label	Crimp A	Crimp B	Pin A	Pin B	Continuity
W1	OEM-X60001-2	SP-14V-1	0.85	☐	☐	☐	☐	☐	☐	☐
W2	OEM-X60001-8	SP-14V-1	0.85	☐	☐	☐	☐	☐	☐	☐
W3	OEM-X60003-4	SP-14V-1	0.85	☐	☐	☐	☐	☐	☐	☐
W4	OEM-X60003-5	SP-14V-1	0.85	☐	☐	☐	☐	☐	☐	☐
W5	SP-14V-1	NEXUSS3-A-18	0.85	☐	☐	☐	☐	☐	☐	☐
W6	SP-14V-1	NEXUSS3-A-25	0.85	☐	☐	☐	☐	☐	☐	☐
W7	OEM-X60001-4	SP-GND-1	0.85	☐	☐	☐	☐	☐	☐	☐
W8	OEM-X60001-5	SP-GND-1	0.85	☐	☐	☐	☐	☐	☐	☐
W9	OEM-X60001-6	SP-GND-1	0.85	☐	☐	☐	☐	☐	☐	☐
W10	OEM-X60001-9	SP-GND-1	0.85	☐	☐	☐	☐	☐	☐	☐
W11	OEM-X60005-5	SP-GND-1	0.85	☐	☐	☐	☐	☐	☐	☐
W12	SP-GND-1	NEXUSS3-A-10	0.85	☐	☐	☐	☐	☐	☐	☐
W13	SP-GND-1	NEXUSS3-A-11	0.85	☐	☐	☐	☐	☐	☐	☐
W14	OEM-X60003-15	SP-0V-1	0.5	☐	☐	☐	☐	☐	☐	☐
W15	OEM-X60003-35	SP-0V-1	0.5	☐	☐	☐	☐	☐	☐	☐
W16	OEM-X60003-36	SP-0V-1	0.5	☐	☐	☐	☐	☐	☐	☐
W17	OEM-X60003-37	SP-0V-1	0.5	☐	☐	☐	☐	☐	☐	☐
W18	OEM-X60003-45	SP-0V-1	0.5	☐	☐	☐	☐	☐	☐	☐
W19	OEM-X60003-49	SP-0V-1	0.5	☐	☐	☐	☐	☐	☐	☐
W20	OEM-X60004-12	SP-0V-1	0.5	☐	☐	☐	☐	☐	☐	☐
W21	OEM-X60004-7	SP-0V-1	0.5	☐	☐	☐	☐	☐	☐	☐
W22	SP-0V-1	NEXUSS3-C-26	0.5	☐	☐	☐	☐	☐	☐	☐
W23	OEM-X60004-14	SP-5V1-1	0.5	☐	☐	☐	☐	☐	☐	☐
W24	OEM-X60004-9	SP-5V1-1	0.5	☐	☐	☐	☐	☐	☐	☐
W25	SP-5V1-1	NEXUSS3-C-25	0.5	☐	☐	☐	☐	☐	☐	☐
W26	OEM-X60003-3	NEXUSS3-C-1	0.5	☐	☐	☐	☐	☐	☐	☐
W27	SP-0V-1	NEXUSS3-C-2	0.5	☐	☐	☐	☐	☐	☐	☐
W28	OEM-X60003-30	NEXUSS3-C-3	0.5	☐	☐	☐	☐	☐	☐	☐
W29	SP-0V-1	NEXUSS3-C-4	0.5	☐	☐	☐	☐	☐	☐	☐
W30	OEM-X60003-29	NEXUSS3-C-5	0.5	☐	☐	☐	☐	☐	☐	☐
W31	OEM-X60003-33	NEXUSS3-C-23	0.5	☐	☐	☐	☐	☐	☐	☐
W32	OEM-X60003-34	NEXUSS3-C-24	0.5	☐	☐	☐	☐	☐	☐	☐
W33	OEM-X60005-6	NEXUSS3-A-27	0.5	☐	☐	☐	☐	☐	☐	☐
W34	OEM-X60005-7	NEXUSS3-A-28	0.5	☐	☐	☐	☐	☐	☐	☐
W35	OEM-X60005-4	NEXUSS3-A-29	0.5	☐	☐	☐	☐	☐	☐	☐
W36	OEM-X60005-8	NEXUSS3-A-30	0.5	☐	☐	☐	☐	☐	☐	☐
W37	OEM-X60005-1	NEXUSS3-A-31	0.5	☐	☐	☐	☐	☐	☐	☐
W38	OEM-X60005-9	NEXUSS3-A-32	0.5	☐	☐	☐	☐	☐	☐	☐
W39	OEM-X60003-13	NEXUSS3-A-1	0.5	☐	☐	☐	☐	☐	☐	☐
W40	OEM-X60003-6	NEXUSS3-A-2	0.5	☐	☐	☐	☐	☐	☐	☐
W41	OEM-X60003-26	NEXUSS3-A-3	0.5	☐	☐	☐	☐	☐	☐	☐
W42	OEM-X60003-7	NEXUSS3-A-4	0.5	☐	☐	☐	☐	☐	☐	☐
W43	OEM-X60003-11	NEXUSS3-A-5	0.5	☐	☐	☐	☐	☐	☐	☐
W44	OEM-X60003-8	NEXUSS3-A-6	0.5	☐	☐	☐	☐	☐	☐	☐
W45	OEM-X60003-42	NEXUSS3-A-19	0.5	☐	☐	☐	☐	☐	☐	☐
W46	OEM-X60003-43	NEXUSS3-A-20	0.5	☐	☐	☐	☐	☐	☐	☐
W47	OEM-X60003-22	NEXUSS3-A-21	0.5	☐	☐	☐	☐	☐	☐	☐
W48	OEM-X60003-23	NEXUSS3-A-22	0.5	☐	☐	☐	☐	☐	☐	☐
W49	OEM-X60001-1	NEXUSS3-A-26	0.5	☐	☐	☐	☐	☐	☐	☐
W50	OEM-X60002-23	NEXUSS3-A-9	0.5	☐	☐	☐	☐	☐	☐	☐
W51	OEM-X60004-10	NEXUSS3-A-12	0.5	☐	☐	☐	☐	☐	☐	☐
W52	OEM-X60002-1	NEXUSS3-C-33	0.5	☐	☐	☐	☐	☐	☐	☐
W53	OEM-X60002-12	NEXUSS3-A-14	0.5	☐	☐	☐	☐	☐	☐	☐
W54	OEM-X60002-2	NEXUSS3-A-15	0.5	☐	☐	☐	☐	☐	☐	☐
W55	OEM-X60002-6	NEXUSS3-A-16	0.5	☐	☐	☐	☐	☐	☐	☐
W56	OEM-X60003-10	NEXUSS3-A-17	0.5	☐	☐	☐	☐	☐	☐	☐
W57	OEM-X60003-12	NEXUSS3-A-7	0.5	☐	☐	☐	☐	☐	☐	☐
W58	OEM-X60003-21	NEXUSS3-A-8	0.5	☐	☐	☐	☐	☐	☐	☐
W59	OEM-X60003-1	NEXUSS3-C-10	0.5	☐	☐	☐	☐	☐	☐	☐
W60	OEM-X60003-32	NEXUSS3-C-11	0.5	☐	☐	☐	☐	☐	☐	☐
W61	OEM-X60004-8	NEXUSS3-C-12	0.5	☐	☐	☐	☐	☐	☐	☐
W62	OEM-X60003-31	NEXUSS3-C-13	0.5	☐	☐	☐	☐	☐	☐	☐
W63	OEM-X60004-13	NEXUSS3-C-14	0.5	☐	☐	☐	☐	☐	☐	☐
W64	OEM-X60002-14	NEXUSS3-C-15	0.5	☐	☐	☐	☐	☐	☐	☐
W65	OEM-X60002-16	NEXUSS3-C-16	0.5	☐	☐	☐	☐	☐	☐	☐
W66	OEM-X60003-28	NEXUSS3-C-17	0.5	☐	☐	☐	☐	☐	☐	☐
W67	OEM-X60003-27	NEXUSS3-C-18	0.5	☐	☐	☐	☐	☐	☐	☐
W68	OEM-X60003-44	NEXUSS3-C-27	0.5	☐	☐	☐	☐	☐	☐	☐
W69	OEM-X60003-16	NEXUSS3-C-6	0.5	☐	☐	☐	☐	☐	☐	☐
W70	OEM-X60003-50	NEXUSS3-C-7	0.5	☐	☐	☐	☐	☐	☐	☐

Bench test (before first power-up)

Battery disconnected, ECU and every sensor unplugged. Meter on resistance. Each pair below must read open (OL): a reading means a pinched wire, a stray strand or a mis-pinned cavity. Then check continuity of every wire (last column of the build checklist).

#	Probe A	Probe B	Expect	Why
1	NEXUSS3-A-18	NEXUSS3-A-10	open (OL)	+12 V supply must not touch power ground
2	NEXUSS3-A-18	NEXUSS3-C-2	open (OL)	+12 V supply must not touch sensor ground
3	NEXUSS3-A-10	NEXUSS3-C-25	open (OL)	power ground must not touch 5 V sensor reference
4	NEXUSS3-A-18	NEXUSS3-C-25	open (OL)	+12 V supply must not touch 5 V sensor reference
5	NEXUSS3-C-2	NEXUSS3-C-25	open (OL)	sensor ground must not touch 5 V sensor reference

Revisions

Rev	Label	By	Date
No revisions yet.

Schematic

Connectors

NEXUSS3-A

Cavity	Function	Signal	Wire	Colour	Gauge (mm²)	Destination	Terminal	Seal	Plug
1	Injector 1	—	W39	—	0.5	OEM-X60003-13	—	—	—
10	Battery ground	—	W12	—	0.85	SP-GND-1	—	—	—
11	Battery ground	—	W13	—	0.85	SP-GND-1	—	—	—
12	DPO 2	—	W51	—	0.5	OEM-X60004-10	—	—	—
13	Ignition switch input	—	—	—	—	—	—	—	—
14	DPO 3	—	W53	—	0.5	OEM-X60002-12	—	—	—
15	DPO 4	—	W54	—	0.5	OEM-X60002-2	—	—	—
16	DPO 5	—	W55	—	0.5	OEM-X60002-6	—	—	—
17	DPO 6	—	W56	—	0.5	OEM-X60003-10	—	—	—
18	+12V switched input	—	W5	—	0.85	SP-14V-1	—	—	—
19	HBO 1	—	W45	—	0.5	OEM-X60003-42	—	—	—
2	Injector 2	—	W40	—	0.5	OEM-X60003-6	—	—	—
20	HBO 2	—	W46	—	0.5	OEM-X60003-43	—	—	—
21	HBO 3	—	W47	—	0.5	OEM-X60003-22	—	—	—
22	HBO 4	—	W48	—	0.5	OEM-X60003-23	—	—	—
23	CAN 1 High	—	—	—	—	—	—	—	—
24	CAN 1 Low	—	—	—	—	—	—	—	—
25	+12V switched input	—	W6	—	0.85	SP-14V-1	—	—	—
26	ECR output	—	W49	—	0.5	OEM-X60001-1	—	—	—
27	Ignition 1	—	W33	—	0.5	OEM-X60005-6	—	—	—
28	Ignition 2	—	W34	—	0.5	OEM-X60005-7	—	—	—
29	Ignition 3	—	W35	—	0.5	OEM-X60005-4	—	—	—
3	Injector 3	—	W41	—	0.5	OEM-X60003-26	—	—	—
30	Ignition 4	—	W36	—	0.5	OEM-X60005-8	—	—	—
31	Ignition 5	—	W37	—	0.5	OEM-X60005-1	—	—	—
32	Ignition 6	—	W38	—	0.5	OEM-X60005-9	—	—	—
33	Ignition 7	—	—	—	—	—	—	—	—
34	Ignition 8	—	—	—	—	—	—	—	—
4	Injector 4	—	W42	—	0.5	OEM-X60003-7	—	—	—
5	Injector 5	—	W43	—	0.5	OEM-X60003-11	—	—	—
6	Injector 6	—	W44	—	0.5	OEM-X60003-8	—	—	—
7	Injector 7	—	W57	—	0.5	OEM-X60003-12	—	—	—
8	Injector 8	—	W58	—	0.5	OEM-X60003-21	—	—	—
9	DPO 1	—	W50	—	0.5	OEM-X60002-23	—	—	—

NEXUSS3-C

Cavity	Function	Signal	Wire	Colour	Gauge (mm²)	Destination	Terminal	Seal	Plug
1	Trigger +	—	W26	—	0.5	OEM-X60003-3	—	—	—
10	AVI 1	—	W59	—	0.5	OEM-X60003-1	—	—	—
11	AVI 2	—	W60	—	0.5	OEM-X60003-32	—	—	—
12	AVI 3	—	W61	—	0.5	OEM-X60004-8	—	—	—
13	AVI 4	—	W62	—	0.5	OEM-X60003-31	—	—	—
14	AVI 5	—	W63	—	0.5	OEM-X60004-13	—	—	—
15	AVI 6	—	W64	—	0.5	OEM-X60002-14	—	—	—
16	AVI 7	—	W65	—	0.5	OEM-X60002-16	—	—	—
17	AVI 8	—	W66	—	0.5	OEM-X60003-28	—	—	—
18	AVI 9	—	W67	—	0.5	OEM-X60003-27	—	—	—
19	SPI 5	—	—	—	—	—	—	—	—
2	Trigger -	—	W27	—	0.5	SP-0V-1	—	—	—
20	SPI 6	—	—	—	—	—	—	—	—
21	CAN 2 High	—	—	—	—	—	—	—	—
22	CAN 2 Low	—	—	—	—	—	—	—	—
23	Knock 1	—	W31	—	0.5	OEM-X60003-33	—	—	—
24	Knock 2	—	W32	—	0.5	OEM-X60003-34	—	—	—
25	+5V	—	W25	—	0.5	SP-5V1-1	—	—	—
26	Signal ground	—	W22	—	0.5	SP-0V-1	—	—	—
27	AVI 10	—	W68	—	0.5	OEM-X60003-44	—	—	—
28	AVI 11	—	—	—	—	—	—	—	—
29	WBI 1 Heater +	—	—	—	—	—	—	—	—
3	Home +	—	W28	—	0.5	OEM-X60003-30	—	—	—
30	WBI 1 Input	—	—	—	—	—	—	—	—
31	WBI 1 Pump	—	—	—	—	—	—	—	—
32	WBI 1 Nernst	—	—	—	—	—	—	—	—
33	WBI 1 Heater -	—	W52	—	0.5	OEM-X60002-1	—	—	—
34	WBI 1 Cal	—	—	—	—	—	—	—	—
4	Home -	—	W29	—	0.5	SP-0V-1	—	—	—
5	SPI 1	—	W30	—	0.5	OEM-X60003-29	—	—	—
6	SPI 2	—	W69	—	0.5	OEM-X60003-16	—	—	—
7	SPI 3	—	W70	—	0.5	OEM-X60003-50	—	—	—
8	SPI 4	—	—	—	—	—	—	—	—
9	+8V	—	—	—	—	—	—	—	—

OEM-X60001

Cavity	Function	Signal	Wire	Colour	Gauge (mm²)	Destination	Terminal	Seal	Plug
1	Injector relay control	—	W49	—	0.5	NEXUSS3-A-26	—	—	—
2	DBW output-stage supply (P_DKSM+)	—	W1	—	0.85	SP-14V-1	—	—	—
4	Power ground	—	W7	—	0.85	SP-GND-1	—	—	—
5	Power ground	—	W8	—	0.85	SP-GND-1	—	—	—
6	Power ground	—	W9	—	0.85	SP-GND-1	—	—	—
7	Battery constant (terminal 30)	—	—	—	—	—	—	—	—
8	ECU main power (terminal 87 via main relay)	—	W2	—	0.85	SP-14V-1	—	—	—
9	DBW output-stage return (P_DKSM-)	—	W10	—	0.85	SP-GND-1	—	—	—

OEM-X60002

Cavity	Function	Signal	Wire	Colour	Gauge (mm²)	Destination	Terminal	Seal	Plug
1	O2 sensor heater, front 1 (pre-cat)	—	W52	—	0.5	NEXUSS3-C-33	—	—	—
12	O2 sensor heater, rear 2 (post-cat)	—	W53	—	0.5	NEXUSS3-A-14	—	—	—
14	O2 sensor signal, rear 2 (post-cat)	—	W64	—	0.5	NEXUSS3-C-15	—	—	—
16	O2 sensor signal, rear 1 (post-cat)	—	W65	—	0.5	NEXUSS3-C-16	—	—	—
2	O2 sensor heater, front 2 (pre-cat)	—	W54	—	0.5	NEXUSS3-A-15	—	—	—
23	Main relay control	—	W50	—	0.5	NEXUSS3-A-9	—	—	—
6	O2 sensor heater, rear 1 (post-cat)	—	W55	—	0.5	NEXUSS3-A-16	—	—	—

OEM-X60003

Cavity	Function	Signal	Wire	Colour	Gauge (mm²)	Destination	Terminal	Seal	Plug
1	Mass air flow (MAF) signal	—	W59	—	0.5	NEXUSS3-C-10	—	—	—
10	VANOS intake solenoid	—	W56	—	0.5	NEXUSS3-A-17	—	—	—
11	Injector cylinder 5	—	W43	—	0.5	NEXUSS3-A-5	—	—	—
12	Map-controlled thermostat	—	W57	—	0.5	NEXUSS3-A-7	—	—	—
13	Injector cylinder 1	—	W39	—	0.5	NEXUSS3-A-1	—	—	—
15	Throttle ground	—	W14	—	0.5	SP-0V-1	—	—	—
16	Oil pressure switch	—	W69	—	0.5	NEXUSS3-C-6	—	—	—
21	Evap purge valve	—	W58	—	0.5	NEXUSS3-A-8	—	—	—
22	Idle speed control, close	—	W47	—	0.5	NEXUSS3-A-21	—	—	—
23	Idle speed control, open	—	W48	—	0.5	NEXUSS3-A-22	—	—	—
26	Injector cylinder 3	—	W41	—	0.5	NEXUSS3-A-3	—	—	—
27	Intake air temperature (IAT)	—	W67	—	0.5	NEXUSS3-C-18	—	—	—
28	Engine coolant temperature (ECT)	—	W66	—	0.5	NEXUSS3-C-17	—	—	—
29	Intake camshaft position	—	W30	—	0.5	NEXUSS3-C-5	—	—	—
3	Crankshaft position	—	W26	—	0.5	NEXUSS3-C-1	—	—	—
30	Exhaust camshaft position	—	W28	—	0.5	NEXUSS3-C-3	—	—	—
31	Throttle position sensor 2	—	W62	—	0.5	NEXUSS3-C-13	—	—	—
32	Throttle position sensor 1	—	W60	—	0.5	NEXUSS3-C-11	—	—	—
33	Knock sensor 1	—	W31	—	0.5	NEXUSS3-C-23	—	—	—
34	Knock sensor 2	—	W32	—	0.5	NEXUSS3-C-24	—	—	—
35	ECT ground	—	W15	—	0.5	SP-0V-1	—	—	—
36	Intake camshaft ground	—	W16	—	0.5	SP-0V-1	—	—	—
37	Crankshaft ground	—	W17	—	0.5	SP-0V-1	—	—	—
4	MAF supply	—	W3	—	0.85	SP-14V-1	—	—	—
42	Throttle motor drive 1 (H-bridge)	—	W45	—	0.5	NEXUSS3-A-19	—	—	—
43	Throttle motor drive 2 (H-bridge)	—	W46	—	0.5	NEXUSS3-A-20	—	—	—
44	Engine oil temperature	—	W68	—	0.5	NEXUSS3-C-27	—	—	—
45	Oil temperature ground	—	W18	—	0.5	SP-0V-1	—	—	—
46	Knock sensor 3	—	—	—	—	—	—	—	—
47	Knock sensor 4	—	—	—	—	—	—	—	—
49	Exhaust camshaft ground	—	W19	—	0.5	SP-0V-1	—	—	—
5	Throttle (EDK/ITB) supply	—	W4	—	0.85	SP-14V-1	—	—	—
50	Oil level switch	—	W70	—	0.5	NEXUSS3-C-7	—	—	—
6	Injector cylinder 2	—	W40	—	0.5	NEXUSS3-A-2	—	—	—
7	Injector cylinder 4	—	W42	—	0.5	NEXUSS3-A-4	—	—	—
8	Injector cylinder 6	—	W44	—	0.5	NEXUSS3-A-6	—	—	—
9	VANOS exhaust solenoid	—	—	—	—	—	—	—	—

OEM-X60004

Cavity	Function	Signal	Wire	Colour	Gauge (mm²)	Destination	Terminal	Seal	Plug
10	Fuel pump relay control	—	W51	—	0.5	NEXUSS3-A-12	—	—	—
12	Pedal ground 2	—	W20	—	0.5	SP-0V-1	—	—	—
13	Pedal position signal 2	—	W63	—	0.5	NEXUSS3-C-14	—	—	—
14	Pedal +5V supply 2	—	W23	—	0.5	SP-5V1-1	—	—	—
7	Pedal ground 1	—	W21	—	0.5	SP-0V-1	—	—	—
8	Pedal position signal 1	—	W61	—	0.5	NEXUSS3-C-12	—	—	—
9	Pedal +5V supply 1	—	W24	—	0.5	SP-5V1-1	—	—	—

OEM-X60005

Cavity	Function	Signal	Wire	Colour	Gauge (mm²)	Destination	Terminal	Seal	Plug
1	Ignition coil 5	—	W37	—	0.5	NEXUSS3-A-31	—	—	—
4	Ignition coil 3	—	W35	—	0.5	NEXUSS3-A-29	—	—	—
5	Ignition ground	—	W11	—	0.85	SP-GND-1	—	—	—
6	Ignition coil 1	—	W33	—	0.5	NEXUSS3-A-27	—	—	—
7	Ignition coil 2	—	W34	—	0.5	NEXUSS3-A-28	—	—	—
8	Ignition coil 4	—	W36	—	0.5	NEXUSS3-A-30	—	—	—
9	Ignition coil 6	—	W38	—	0.5	NEXUSS3-A-32	—	—	—

SP-0V

Cavity	Function	Signal	Wire	Colour	Gauge (mm²)	Destination	Terminal	Seal	Plug
1	—	—	W14	—	0.5	OEM-X60003-15	—	—	—
1	—	—	W15	—	0.5	OEM-X60003-35	—	—	—
1	—	—	W16	—	0.5	OEM-X60003-36	—	—	—
1	—	—	W17	—	0.5	OEM-X60003-37	—	—	—
1	—	—	W18	—	0.5	OEM-X60003-45	—	—	—
1	—	—	W19	—	0.5	OEM-X60003-49	—	—	—
1	—	—	W20	—	0.5	OEM-X60004-12	—	—	—
1	—	—	W21	—	0.5	OEM-X60004-7	—	—	—
1	—	—	W22	—	0.5	NEXUSS3-C-26	—	—	—
1	—	—	W27	—	0.5	NEXUSS3-C-2	—	—	—
1	—	—	W29	—	0.5	NEXUSS3-C-4	—	—	—

SP-14V

Cavity	Function	Signal	Wire	Colour	Gauge (mm²)	Destination	Terminal	Seal	Plug
1	—	—	W1	—	0.85	OEM-X60001-2	—	—	—
1	—	—	W2	—	0.85	OEM-X60001-8	—	—	—
1	—	—	W3	—	0.85	OEM-X60003-4	—	—	—
1	—	—	W4	—	0.85	OEM-X60003-5	—	—	—
1	—	—	W5	—	0.85	NEXUSS3-A-18	—	—	—
1	—	—	W6	—	0.85	NEXUSS3-A-25	—	—	—

SP-5V1

Cavity	Function	Signal	Wire	Colour	Gauge (mm²)	Destination	Terminal	Seal	Plug
1	—	—	W23	—	0.5	OEM-X60004-14	—	—	—
1	—	—	W24	—	0.5	OEM-X60004-9	—	—	—
1	—	—	W25	—	0.5	NEXUSS3-C-25	—	—	—

SP-GND

Cavity	Function	Signal	Wire	Colour	Gauge (mm²)	Destination	Terminal	Seal	Plug
1	—	—	W7	—	0.85	OEM-X60001-4	—	—	—
1	—	—	W8	—	0.85	OEM-X60001-5	—	—	—
1	—	—	W9	—	0.85	OEM-X60001-6	—	—	—
1	—	—	W10	—	0.85	OEM-X60001-9	—	—	—
1	—	—	W11	—	0.85	OEM-X60005-5	—	—	—
1	—	—	W12	—	0.85	NEXUSS3-A-10	—	—	—
1	—	—	W13	—	0.85	NEXUSS3-A-11	—	—	—

Pin map

OEM point	OEM function	OEM family	Target point	Target function	Target family	Evidence
OEM-X60001-1	Injector relay control	low_side_out	NEXUSS3-A-26	ECR output	low_side_out	corroborated
OEM-X60001-2	DBW output-stage supply (P_DKSM+)	power_in	NEXUSS3-A-18 + NEXUSS3-A-25	+12V switched input + +12V switched input	power_in	single_source
OEM-X60001-4	Power ground	ground	NEXUSS3-A-10 + NEXUSS3-A-11	Battery ground + Battery ground	ground	corroborated
OEM-X60001-5	Power ground	ground	NEXUSS3-A-10 + NEXUSS3-A-11	Battery ground + Battery ground	ground	corroborated
OEM-X60001-6	Power ground	ground	NEXUSS3-A-10 + NEXUSS3-A-11	Battery ground + Battery ground	ground	corroborated
OEM-X60001-7	Battery constant (terminal 30)	power_in	—	—	—	corroborated
OEM-X60001-8	ECU main power (terminal 87 via main relay)	power_in	NEXUSS3-A-18 + NEXUSS3-A-25	+12V switched input + +12V switched input	power_in	corroborated
OEM-X60001-9	DBW output-stage return (P_DKSM-)	ground	NEXUSS3-A-10 + NEXUSS3-A-11	Battery ground + Battery ground	ground	single_source
OEM-X60002-1	O2 sensor heater, front 1 (pre-cat)	low_side_out	NEXUSS3-C-33	WBI 1 Heater -	low_side_out	corroborated
OEM-X60002-12	O2 sensor heater, rear 2 (post-cat)	low_side_out	NEXUSS3-A-14	DPO 3	low_side_out	corroborated
OEM-X60002-14	O2 sensor signal, rear 2 (post-cat)	lambda_nb_in	NEXUSS3-C-15	AVI 6	analog_in	corroborated
OEM-X60002-16	O2 sensor signal, rear 1 (post-cat)	lambda_nb_in	NEXUSS3-C-16	AVI 7	analog_in	corroborated
OEM-X60002-2	O2 sensor heater, front 2 (pre-cat)	low_side_out	NEXUSS3-A-15	DPO 4	low_side_out	corroborated
OEM-X60002-23	Main relay control	low_side_out	NEXUSS3-A-9	DPO 1	low_side_out	corroborated
OEM-X60002-6	O2 sensor heater, rear 1 (post-cat)	low_side_out	NEXUSS3-A-16	DPO 5	low_side_out	corroborated
OEM-X60003-1	Mass air flow (MAF) signal	analog_in	NEXUSS3-C-10	AVI 1	analog_in	corroborated
OEM-X60003-10	VANOS intake solenoid	low_side_out	NEXUSS3-A-17	DPO 6	low_side_out	corroborated
OEM-X60003-11	Injector cylinder 5	injector_out	NEXUSS3-A-5	Injector 5	injector_out	corroborated
OEM-X60003-12	Map-controlled thermostat	low_side_out	NEXUSS3-A-7	Injector 7	injector_out	corroborated
OEM-X60003-13	Injector cylinder 1	injector_out	NEXUSS3-A-1	Injector 1	injector_out	corroborated
OEM-X60003-15	Throttle ground	sensor_ground	NEXUSS3-C-2 + NEXUSS3-C-26 + NEXUSS3-C-4	Trigger - + Signal ground + Home -	sensor_ground + trigger_in	corroborated
OEM-X60003-16	Oil pressure switch	digital_in	NEXUSS3-C-6	SPI 2	digital_in	corroborated
OEM-X60003-21	Evap purge valve	low_side_out	NEXUSS3-A-8	Injector 8	injector_out	corroborated
OEM-X60003-22	Idle speed control, close	hbridge_out	NEXUSS3-A-21	HBO 3	hbridge_out	corroborated
OEM-X60003-23	Idle speed control, open	hbridge_out	NEXUSS3-A-22	HBO 4	hbridge_out	corroborated
OEM-X60003-26	Injector cylinder 3	injector_out	NEXUSS3-A-3	Injector 3	injector_out	corroborated
OEM-X60003-27	Intake air temperature (IAT)	temp_in	NEXUSS3-C-18	AVI 9	analog_in	corroborated
OEM-X60003-28	Engine coolant temperature (ECT)	temp_in	NEXUSS3-C-17	AVI 8	analog_in	corroborated
OEM-X60003-29	Intake camshaft position	trigger_in	NEXUSS3-C-5	SPI 1	digital_in	corroborated
OEM-X60003-3	Crankshaft position	trigger_in	NEXUSS3-C-1	Trigger +	trigger_in	corroborated
OEM-X60003-30	Exhaust camshaft position	trigger_in	NEXUSS3-C-3	Home +	trigger_in	corroborated
OEM-X60003-31	Throttle position sensor 2	analog_in	NEXUSS3-C-13	AVI 4	analog_in	corroborated
OEM-X60003-32	Throttle position sensor 1	analog_in	NEXUSS3-C-11	AVI 2	analog_in	corroborated
OEM-X60003-33	Knock sensor 1	knock_in	NEXUSS3-C-23	Knock 1	knock_in	corroborated
OEM-X60003-34	Knock sensor 2	knock_in	NEXUSS3-C-24	Knock 2	knock_in	corroborated
OEM-X60003-35	ECT ground	sensor_ground	NEXUSS3-C-2 + NEXUSS3-C-26 + NEXUSS3-C-4	Trigger - + Signal ground + Home -	sensor_ground + trigger_in	corroborated
OEM-X60003-36	Intake camshaft ground	sensor_ground	NEXUSS3-C-2 + NEXUSS3-C-26 + NEXUSS3-C-4	Trigger - + Signal ground + Home -	sensor_ground + trigger_in	corroborated
OEM-X60003-37	Crankshaft ground	sensor_ground	NEXUSS3-C-2 + NEXUSS3-C-26 + NEXUSS3-C-4	Trigger - + Signal ground + Home -	sensor_ground + trigger_in	corroborated
OEM-X60003-4	MAF supply	power_in	NEXUSS3-A-18 + NEXUSS3-A-25	+12V switched input + +12V switched input	power_in	corroborated
OEM-X60003-42	Throttle motor drive 1 (H-bridge)	hbridge_out	NEXUSS3-A-19	HBO 1	hbridge_out	corroborated
OEM-X60003-43	Throttle motor drive 2 (H-bridge)	hbridge_out	NEXUSS3-A-20	HBO 2	hbridge_out	corroborated
OEM-X60003-44	Engine oil temperature	temp_in	NEXUSS3-C-27	AVI 10	analog_in	corroborated
OEM-X60003-45	Oil temperature ground	sensor_ground	NEXUSS3-C-2 + NEXUSS3-C-26 + NEXUSS3-C-4	Trigger - + Signal ground + Home -	sensor_ground + trigger_in	corroborated
OEM-X60003-46	Knock sensor 3	knock_in	—	—	—	corroborated
OEM-X60003-47	Knock sensor 4	knock_in	—	—	—	corroborated
OEM-X60003-49	Exhaust camshaft ground	sensor_ground	NEXUSS3-C-2 + NEXUSS3-C-26 + NEXUSS3-C-4	Trigger - + Signal ground + Home -	sensor_ground + trigger_in	corroborated
OEM-X60003-5	Throttle (EDK/ITB) supply	power_in	NEXUSS3-A-18 + NEXUSS3-A-25	+12V switched input + +12V switched input	power_in	corroborated
OEM-X60003-50	Oil level switch	digital_in	NEXUSS3-C-7	SPI 3	digital_in	corroborated
OEM-X60003-6	Injector cylinder 2	injector_out	NEXUSS3-A-2	Injector 2	injector_out	corroborated
OEM-X60003-7	Injector cylinder 4	injector_out	NEXUSS3-A-4	Injector 4	injector_out	corroborated
OEM-X60003-8	Injector cylinder 6	injector_out	NEXUSS3-A-6	Injector 6	injector_out	corroborated
OEM-X60003-9	VANOS exhaust solenoid	low_side_out	—	—	—	corroborated
OEM-X60004-10	Fuel pump relay control	low_side_out	NEXUSS3-A-12	DPO 2	low_side_out	corroborated
OEM-X60004-12	Pedal ground 2	sensor_ground	NEXUSS3-C-2 + NEXUSS3-C-26 + NEXUSS3-C-4	Trigger - + Signal ground + Home -	sensor_ground + trigger_in	corroborated
OEM-X60004-13	Pedal position signal 2	analog_in	NEXUSS3-C-14	AVI 5	analog_in	corroborated
OEM-X60004-14	Pedal +5V supply 2	vref	NEXUSS3-C-25	+5V	vref	corroborated
OEM-X60004-7	Pedal ground 1	sensor_ground	NEXUSS3-C-2 + NEXUSS3-C-26 + NEXUSS3-C-4	Trigger - + Signal ground + Home -	sensor_ground + trigger_in	corroborated
OEM-X60004-8	Pedal position signal 1	analog_in	NEXUSS3-C-12	AVI 3	analog_in	corroborated
OEM-X60004-9	Pedal +5V supply 1	vref	NEXUSS3-C-25	+5V	vref	corroborated
OEM-X60005-1	Ignition coil 5	ignition_out	NEXUSS3-A-31	Ignition 5	ignition_out	corroborated
OEM-X60005-4	Ignition coil 3	ignition_out	NEXUSS3-A-29	Ignition 3	ignition_out	corroborated
OEM-X60005-5	Ignition ground	ground	NEXUSS3-A-10 + NEXUSS3-A-11	Battery ground + Battery ground	ground	corroborated
OEM-X60005-6	Ignition coil 1	ignition_out	NEXUSS3-A-27	Ignition 1	ignition_out	corroborated
OEM-X60005-7	Ignition coil 2	ignition_out	NEXUSS3-A-28	Ignition 2	ignition_out	corroborated
OEM-X60005-8	Ignition coil 4	ignition_out	NEXUSS3-A-30	Ignition 4	ignition_out	corroborated
OEM-X60005-9	Ignition coil 6	ignition_out	NEXUSS3-A-32	Ignition 6	ignition_out	corroborated

Cut list

Wire	From	To	Gauge (mm²)	Length	Signal	Ident
W1	OEM-X60001-2	SP-14V-1	0.85	no route	DBW output-stage supply (P_DKSM+)	—
W2	OEM-X60001-8	SP-14V-1	0.85	no route	ECU main power (terminal 87 via main relay)	—
W3	OEM-X60003-4	SP-14V-1	0.85	no route	MAF supply	—
W4	OEM-X60003-5	SP-14V-1	0.85	no route	Throttle (EDK/ITB) supply	—
W5	SP-14V-1	NEXUSS3-A-18	0.85	no route	+12V switched input	—
W6	SP-14V-1	NEXUSS3-A-25	0.85	no route	+12V switched input	—
W7	OEM-X60001-4	SP-GND-1	0.85	no route	Power ground	—
W8	OEM-X60001-5	SP-GND-1	0.85	no route	Power ground	—
W9	OEM-X60001-6	SP-GND-1	0.85	no route	Power ground	—
W10	OEM-X60001-9	SP-GND-1	0.85	no route	DBW output-stage return (P_DKSM-)	—
W11	OEM-X60005-5	SP-GND-1	0.85	no route	Ignition ground	—
W12	SP-GND-1	NEXUSS3-A-10	0.85	no route	Battery ground	—
W13	SP-GND-1	NEXUSS3-A-11	0.85	no route	Battery ground	—
W14	OEM-X60003-15	SP-0V-1	0.5	no route	Throttle ground	—
W15	OEM-X60003-35	SP-0V-1	0.5	no route	ECT ground	—
W16	OEM-X60003-36	SP-0V-1	0.5	no route	Intake camshaft ground	—
W17	OEM-X60003-37	SP-0V-1	0.5	no route	Crankshaft ground	—
W18	OEM-X60003-45	SP-0V-1	0.5	no route	Oil temperature ground	—
W19	OEM-X60003-49	SP-0V-1	0.5	no route	Exhaust camshaft ground	—
W20	OEM-X60004-12	SP-0V-1	0.5	no route	Pedal ground 2	—
W21	OEM-X60004-7	SP-0V-1	0.5	no route	Pedal ground 1	—
W22	SP-0V-1	NEXUSS3-C-26	0.5	no route	Signal ground	—
W23	OEM-X60004-14	SP-5V1-1	0.5	no route	Pedal +5V supply 2	—
W24	OEM-X60004-9	SP-5V1-1	0.5	no route	Pedal +5V supply 1	—
W25	SP-5V1-1	NEXUSS3-C-25	0.5	no route	+5V	—
W26	OEM-X60003-3	NEXUSS3-C-1	0.5	no route	Crankshaft position	—
W27	SP-0V-1	NEXUSS3-C-2	0.5	no route	Trigger -	—
W28	OEM-X60003-30	NEXUSS3-C-3	0.5	no route	Exhaust camshaft position	—
W29	SP-0V-1	NEXUSS3-C-4	0.5	no route	Home -	—
W30	OEM-X60003-29	NEXUSS3-C-5	0.5	no route	Intake camshaft position	—
W31	OEM-X60003-33	NEXUSS3-C-23	0.5	no route	Knock sensor 1	—
W32	OEM-X60003-34	NEXUSS3-C-24	0.5	no route	Knock sensor 2	—
W33	OEM-X60005-6	NEXUSS3-A-27	0.5	no route	Ignition coil 1	—
W34	OEM-X60005-7	NEXUSS3-A-28	0.5	no route	Ignition coil 2	—
W35	OEM-X60005-4	NEXUSS3-A-29	0.5	no route	Ignition coil 3	—
W36	OEM-X60005-8	NEXUSS3-A-30	0.5	no route	Ignition coil 4	—
W37	OEM-X60005-1	NEXUSS3-A-31	0.5	no route	Ignition coil 5	—
W38	OEM-X60005-9	NEXUSS3-A-32	0.5	no route	Ignition coil 6	—
W39	OEM-X60003-13	NEXUSS3-A-1	0.5	no route	Injector cylinder 1	—
W40	OEM-X60003-6	NEXUSS3-A-2	0.5	no route	Injector cylinder 2	—
W41	OEM-X60003-26	NEXUSS3-A-3	0.5	no route	Injector cylinder 3	—
W42	OEM-X60003-7	NEXUSS3-A-4	0.5	no route	Injector cylinder 4	—
W43	OEM-X60003-11	NEXUSS3-A-5	0.5	no route	Injector cylinder 5	—
W44	OEM-X60003-8	NEXUSS3-A-6	0.5	no route	Injector cylinder 6	—
W45	OEM-X60003-42	NEXUSS3-A-19	0.5	no route	Throttle motor drive 1 (H-bridge)	—
W46	OEM-X60003-43	NEXUSS3-A-20	0.5	no route	Throttle motor drive 2 (H-bridge)	—
W47	OEM-X60003-22	NEXUSS3-A-21	0.5	no route	Idle speed control, close	—
W48	OEM-X60003-23	NEXUSS3-A-22	0.5	no route	Idle speed control, open	—
W49	OEM-X60001-1	NEXUSS3-A-26	0.5	no route	Injector relay control	—
W50	OEM-X60002-23	NEXUSS3-A-9	0.5	no route	Main relay control	—
W51	OEM-X60004-10	NEXUSS3-A-12	0.5	no route	Fuel pump relay control	—
W52	OEM-X60002-1	NEXUSS3-C-33	0.5	no route	O2 sensor heater, front 1 (pre-cat)	—
W53	OEM-X60002-12	NEXUSS3-A-14	0.5	no route	O2 sensor heater, rear 2 (post-cat)	—
W54	OEM-X60002-2	NEXUSS3-A-15	0.5	no route	O2 sensor heater, front 2 (pre-cat)	—
W55	OEM-X60002-6	NEXUSS3-A-16	0.5	no route	O2 sensor heater, rear 1 (post-cat)	—
W56	OEM-X60003-10	NEXUSS3-A-17	0.5	no route	VANOS intake solenoid	—
W57	OEM-X60003-12	NEXUSS3-A-7	0.5	no route	Map-controlled thermostat	—
W58	OEM-X60003-21	NEXUSS3-A-8	0.5	no route	Evap purge valve	—
W59	OEM-X60003-1	NEXUSS3-C-10	0.5	no route	Mass air flow (MAF) signal	—
W60	OEM-X60003-32	NEXUSS3-C-11	0.5	no route	Throttle position sensor 1	—
W61	OEM-X60004-8	NEXUSS3-C-12	0.5	no route	Pedal position signal 1	—
W62	OEM-X60003-31	NEXUSS3-C-13	0.5	no route	Throttle position sensor 2	—
W63	OEM-X60004-13	NEXUSS3-C-14	0.5	no route	Pedal position signal 2	—
W64	OEM-X60002-14	NEXUSS3-C-15	0.5	no route	O2 sensor signal, rear 2 (post-cat)	—
W65	OEM-X60002-16	NEXUSS3-C-16	0.5	no route	O2 sensor signal, rear 1 (post-cat)	—
W66	OEM-X60003-28	NEXUSS3-C-17	0.5	no route	Engine coolant temperature (ECT)	—
W67	OEM-X60003-27	NEXUSS3-C-18	0.5	no route	Intake air temperature (IAT)	—
W68	OEM-X60003-44	NEXUSS3-C-27	0.5	no route	Engine oil temperature	—
W69	OEM-X60003-16	NEXUSS3-C-6	0.5	no route	Oil pressure switch	—
W70	OEM-X60003-50	NEXUSS3-C-7	0.5	no route	Oil level switch	—

Bill of materials

Category	Part number	Manufacturer	Description	Qty	Unit
connector	BMW-E46-MSS54-CONN	BMW	E46 DME (MSS54) harness connector	1.000	ea

ECU setup sheet

Role	Engine ref	Engine signal	Sensor	ECU point	ECU function	ECU class	Setup flag
No configured channels.

Findings

Open (10)

Severity	Code	Subject	Message
warn	DBW_MOTOR_CURRENT	NEXUSS3-A-19	Cannot confirm Nexus S3 can drive the throttle motor: NEXUSS3-A-19 "HBO 1" is rated 8.0 A, but the motor current at OEM-X60003-42 is unknown. Add the motor's peak current from a source, or measure the motor resistance: peak ≈ 14 V ÷ R (Hondata measured 4.9 A for a Civic Si body, 10.4 A for a ZDX body; holding current is about 1 A).
warn	DBW_MOTOR_CURRENT	NEXUSS3-A-20	Cannot confirm Nexus S3 can drive the throttle motor: NEXUSS3-A-20 "HBO 2" is rated 8.0 A, but the motor current at OEM-X60003-43 is unknown. Add the motor's peak current from a source, or measure the motor resistance: peak ≈ 14 V ÷ R (Hondata measured 4.9 A for a Civic Si body, 10.4 A for a ZDX body; holding current is about 1 A).
warn	NET_FAMILY	OEM-X60003-29 ↔ NEXUSS3-C-5	OEM-X60003-29 "Intake camshaft position" [trigger_in] is wired to NEXUSS3-C-5 "SPI 1" [digital_in]. Hall-type cam/speed signals can use a digital input if it handles the frequency; VR signals cannot.
info	NET_FAMILY	OEM-X60003-12 ↔ NEXUSS3-A-7	OEM-X60003-12 "Map-controlled thermostat" [low_side_out] is wired to NEXUSS3-A-7 "Injector 7" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency.
info	NET_FAMILY	OEM-X60003-15 ↔ NEXUSS3-C-2	OEM-X60003-15 "Throttle ground" [sensor_ground] is wired to NEXUSS3-C-2 "Trigger -" [trigger_in]. Trigger return tied to sensor/trigger ground: correct for single-ended trigger inputs.
info	NET_FAMILY	OEM-X60003-21 ↔ NEXUSS3-A-8	OEM-X60003-21 "Evap purge valve" [low_side_out] is wired to NEXUSS3-A-8 "Injector 8" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency.
info	NET_FAMILY	OEM-X60003-27 ↔ NEXUSS3-C-18	OEM-X60003-27 "Intake air temperature (IAT)" [temp_in] is wired to NEXUSS3-C-18 "AVI 9" [analog_in]. Thermistor on a plain analog input needs a pull-up; check the channel can enable one.
info	NET_FAMILY	OEM-X60003-28 ↔ NEXUSS3-C-17	OEM-X60003-28 "Engine coolant temperature (ECT)" [temp_in] is wired to NEXUSS3-C-17 "AVI 8" [analog_in]. Thermistor on a plain analog input needs a pull-up; check the channel can enable one.
info	NET_FAMILY	OEM-X60003-44 ↔ NEXUSS3-C-27	OEM-X60003-44 "Engine oil temperature" [temp_in] is wired to NEXUSS3-C-27 "AVI 10" [analog_in]. Thermistor on a plain analog input needs a pull-up; check the channel can enable one.
info	UNMAPPED	OEM	3 optional OEM pins are not mapped: OEM-X60003-46 Knock sensor 3; OEM-X60003-47 Knock sensor 4; OEM-X60003-9 VANOS exhaust solenoid

Accepted (1)

Code	Subject	Reason	By
REQUIRED_UNMAPPED	OEM-X60001-7	Battery-constant (memory) feed of the stock ECU: the new ECU has no such input, so it is not needed.	mapping-proposal

Notes

Fit check: unconfirmed. Confirm these before building: - Needs CAN (E46 K-bus/CAN); not documented for this ECU - Trigger pattern for BMW S54 not found in the ECU's docs (no BMW S-series trigger preset named) - This car has EWS 3.3 (rolling code) immobilizer; needs a delete/bypass Auto-mapped by auto_map() from the library pin data on 2026-10-06. Review every wire against both manuals before building. Not wired: - OEM-X60001 7: Battery constant (terminal 30): Haltech Nexus S3 has no battery-constant input; not needed - OEM-X60003 46: Knock sensor 3: no free knock input on Haltech Nexus S3 - OEM-X60003 47: Knock sensor 4: no free knock input on Haltech Nexus S3 - OEM-X60003 9: VANOS exhaust solenoid: no free low_side/ls_hs/injector/hbridge on Haltech Nexus S3 - NEXUSS3-A 13: Ignition switch input: not fed (the stock ECU has no ignition-sense pin); feed it from a switched-ignition source

Sources

Reliability	Kind	Title	URL	Archive	Captured	SHA-256
4	oem_wiring_diagram	BMW WDS A6000 DME pin table, E83 X3 (M54B30/MS45)	https://wds.psjr.org/sv/e83/zinfo/E83_PA6000A.htm	—	—	—
4	vendor_doc	Haltech: Nexus S3 Plug 'n' Play adapter QSG (Subaru WRX/STI ADM, HT-186300) — ECU Connector A & C pinout	https://www.haltech.com/product/ht-186300-nexus-s3-plug-n-play-adapter-harness/	archive	2026-10-05	3cab7cd337c2
4	vendor_doc	Haltech: Nexus S3/S2 ECU Overview (QSG) — specifications	https://store.haltech.com/product/ht-213000-nexus-s3-ecu-only/	archive	2026-10-05	388299668207
2	community_copy	bimmer-service: DME MSS54 (S54) pinout	https://www.bimmer-service.com/2025/11/14/dme-mss54-s54-pinout-schematic-diagram/	—	—	—
2	community_copy	rusefi wiki: 2002 and 2004 BMW M3 E46 DME pinout (S54/MSS54)	https://github.com/rusefi/rusefi/wiki/2002-and-2004-BMW-M3-E46-DME-pinout	—	—	—