BMW 3 Series E36 1990–2000 (M50/M52) → Link G4X XtremeX 109-4000 (auto)
BMW 3 Series E36 1990–2000 (M50/M52) — Link — G4X XtremeX
Drawn by Michael Gnankou · Rev 0 · proposal · 2026-10-08
Before you start
| Status | proposal · not yet verified: nobody has reported building and running this harness |
|---|---|
| Open errors | none |
| Size of the job | 51 wires · 7 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 | Colour | Cut | Label | Crimp A | Crimp B | Pin A | Pin B | Continuity |
|---|---|---|---|---|---|---|---|---|---|---|---|
| W1 | OEM-X-54 | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W2 | SP-14V-1 | G4XXTREMEX-A-A5 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | SP-14V-1 | G4XXTREMEX-B-B5 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | OEM-X-15 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | OEM-X-34 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-X-55 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | OEM-X-6 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | SP-GND-1 | G4XXTREMEX-A-A25 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | SP-GND-1 | G4XXTREMEX-A-A34 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | SP-GND-1 | G4XXTREMEX-B-B25 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | SP-GND-1 | G4XXTREMEX-B-B34 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | OEM-X-28 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-X-40 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-X-43 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-X-44 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-X-71 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | SP-0V-1 | G4XXTREMEX-A-A24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | SP-0V-1 | G4XXTREMEX-B-B22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-X-59 | G4XXTREMEX-A-A32 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-X-16 | G4XXTREMEX-A-A8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-X-17 | G4XXTREMEX-A-A9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-X-70 | G4XXTREMEX-B-B9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-X-69 | G4XXTREMEX-B-B8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-X-50 | G4XXTREMEX-A-A13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-X-51 | G4XXTREMEX-A-A12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-X-52 | G4XXTREMEX-A-A11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-X-23 | G4XXTREMEX-A-A10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-X-25 | G4XXTREMEX-B-B13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-X-24 | G4XXTREMEX-B-B12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-X-33 | G4XXTREMEX-A-A4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-X-32 | G4XXTREMEX-A-A3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-X-31 | G4XXTREMEX-A-A2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-X-5 | G4XXTREMEX-A-A1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-X-3 | G4XXTREMEX-B-B4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-X-4 | G4XXTREMEX-B-B3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-X-45 | SP-SHD-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | SP-SHD-1 | G4XXTREMEX-A-A7 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-X-1 | G4XXTREMEX-A-A21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-X-27 | G4XXTREMEX-A-A20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W40 | OEM-X-38 | G4XXTREMEX-A-A19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W41 | OEM-X-2 | G4XXTREMEX-A-A18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W42 | OEM-X-29 | G4XXTREMEX-A-A29 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W43 | OEM-X-36 | G4XXTREMEX-A-A28 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W44 | OEM-X-7 | G4XXTREMEX-A-A27 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W45 | OEM-X-8 | G4XXTREMEX-A-A26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W46 | OEM-X-41 | G4XXTREMEX-A-A17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W47 | OEM-X-73 | G4XXTREMEX-A-A22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W48 | OEM-X-13 | G4XXTREMEX-A-A33 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W49 | OEM-X-78 | G4XXTREMEX-A-A15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W50 | OEM-X-77 | G4XXTREMEX-A-A16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W51 | OEM-X-42 | G4XXTREMEX-A-A30 | 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 | Reading |
|---|---|---|---|---|---|
| 1 | G4XXTREMEX-A-A24 | G4XXTREMEX-A-A32 | open (OL) | sensor ground must not touch 5 V sensor reference | |
| 2 | G4XXTREMEX-A-A24 | G4XXTREMEX-A-A5 | open (OL) | sensor ground must not touch +12 V supply | |
| 3 | G4XXTREMEX-A-A25 | G4XXTREMEX-A-A32 | open (OL) | power ground must not touch 5 V sensor reference | |
| 4 | G4XXTREMEX-A-A25 | G4XXTREMEX-A-A5 | open (OL) | power ground must not touch +12 V supply | |
| 5 | G4XXTREMEX-A-A5 | G4XXTREMEX-A-A32 | open (OL) | +12 V supply must not touch 5 V sensor reference |
Revisions
| Rev | Label | By | Date |
|---|---|---|---|
| No revisions yet. | |||
Schematic
Connectors
G4XXTREMEX-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A1 | Injector 4 | — | W33 | — | 0.5 | OEM-X-5 | — | — | — |
| A10 | Ignition 4 | — | W27 | — | 0.5 | OEM-X-23 | — | — | — |
| A11 | Ignition 3 | — | W26 | — | 0.5 | OEM-X-52 | — | — | — |
| A12 | Ignition 2 | — | W25 | — | 0.5 | OEM-X-51 | — | — | — |
| A13 | Ignition 1 | — | W24 | — | 0.5 | OEM-X-50 | — | — | — |
| A14 | Analog Volt 4 | — | — | — | — | — | — | — | — |
| A15 | Analog Temp 1 | — | W49 | — | 0.5 | OEM-X-78 | — | — | — |
| A16 | Analog Temp 2 | — | W50 | — | 0.5 | OEM-X-77 | — | — | — |
| A17 | Analog Volt 1 | — | W46 | — | 0.5 | OEM-X-41 | — | — | — |
| A18 | Aux 4 | — | W41 | — | 0.5 | OEM-X-2 | — | — | — |
| A19 | Aux 3 | — | W40 | — | 0.5 | OEM-X-38 | — | — | — |
| A2 | Injector 3 | — | W32 | — | 0.5 | OEM-X-31 | — | — | — |
| A20 | Aux 2 | — | W39 | — | 0.5 | OEM-X-27 | — | — | — |
| A21 | Aux 1 | — | W38 | — | 0.5 | OEM-X-1 | — | — | — |
| A22 | Analog Volt 2 | — | W47 | — | 0.5 | OEM-X-73 | — | — | — |
| A23 | Digital Input 3 | — | — | — | — | — | — | — | — |
| A24 | Sensor Ground | — | W17 | — | 0.5 | SP-0V-1 | — | — | — |
| A25 | System Ground | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| A26 | Aux 8 | — | W45 | — | 0.5 | OEM-X-8 | — | — | — |
| A27 | Aux 7 | — | W44 | — | 0.5 | OEM-X-7 | — | — | — |
| A28 | Aux 6 | — | W43 | — | 0.5 | OEM-X-36 | — | — | — |
| A29 | Aux 5 | — | W42 | — | 0.5 | OEM-X-29 | — | — | — |
| A3 | Injector 2 | — | W31 | — | 0.5 | OEM-X-32 | — | — | — |
| A30 | Digital Input 1 | — | W51 | — | 0.5 | OEM-X-42 | — | — | — |
| A31 | Digital Input 2 | — | — | — | — | — | — | — | — |
| A32 | +5V Out | — | W19 | — | 0.5 | OEM-X-59 | — | — | — |
| A33 | Analog Volt 3 | — | W48 | — | 0.5 | OEM-X-13 | — | — | — |
| A34 | System Ground | — | W9 | — | 0.85 | SP-GND-1 | — | — | — |
| A4 | Injector 1 | — | W30 | — | 0.5 | OEM-X-33 | — | — | — |
| A5 | +14V ECU Power | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| A6 | +8V Out | — | — | — | — | — | — | — | — |
| A7 | Shield Ground | — | W37 | — | 0.5 | SP-SHD-1 | — | — | — |
| A8 | Trigger 1 | — | W20 | — | 0.5 | OEM-X-16 | — | — | — |
| A9 | Trigger 2 | — | W21 | — | 0.5 | OEM-X-17 | — | — | — |
G4XXTREMEX-B
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| B1 | Injector 8 | — | — | — | — | — | — | — | — |
| B10 | Ignition 8 | — | — | — | — | — | — | — | — |
| B11 | Ignition 7 | — | — | — | — | — | — | — | — |
| B12 | Ignition 6 | — | W29 | — | 0.5 | OEM-X-24 | — | — | — |
| B13 | Ignition 5 | — | W28 | — | 0.5 | OEM-X-25 | — | — | — |
| B15 | Analog Volt 6 | — | — | — | — | — | — | — | — |
| B16 | Analog Volt 7 | — | — | — | — | — | — | — | — |
| B17 | Shield Ground | — | — | — | — | — | — | — | — |
| B18 | Aux 9 | — | — | — | — | — | — | — | — |
| B19 | Digital Input 6 | — | — | — | — | — | — | — | — |
| B2 | Injector 7 | — | — | — | — | — | — | — | — |
| B20 | Digital Input 5 | — | — | — | — | — | — | — | — |
| B21 | Digital Input 4 | — | — | — | — | — | — | — | — |
| B22 | Sensor Ground | — | W18 | — | 0.5 | SP-0V-1 | — | — | — |
| B23 | Analog Volt 8 | — | — | — | — | — | — | — | — |
| B24 | Analog Volt 9 | — | — | — | — | — | — | — | — |
| B25 | System Ground | — | W10 | — | 0.85 | SP-GND-1 | — | — | — |
| B26 | Aux 10 | — | — | — | — | — | — | — | — |
| B27 | CAN 2 H | — | — | — | — | — | — | — | — |
| B28 | CAN 2 L | — | — | — | — | — | — | — | — |
| B29 | Digital Input 8 | — | — | — | — | — | — | — | — |
| B3 | Injector 6 | — | W35 | — | 0.5 | OEM-X-4 | — | — | — |
| B30 | Digital Input 7 | — | — | — | — | — | — | — | — |
| B31 | Analog Volt 10 | — | — | — | — | — | — | — | — |
| B32 | Analog Volt 11 | — | — | — | — | — | — | — | — |
| B33 | Analog Volt 5 | — | — | — | — | — | — | — | — |
| B34 | System Ground | — | W11 | — | 0.85 | SP-GND-1 | — | — | — |
| B4 | Injector 5 | — | W34 | — | 0.5 | OEM-X-3 | — | — | — |
| B5 | Aux 9/10 E-Throttle Supply | — | W3 | — | 0.85 | SP-14V-1 | — | — | — |
| B6 | Analog Temp 3 | — | — | — | — | — | — | — | — |
| B7 | Analog Temp 4 | — | — | — | — | — | — | — | — |
| B8 | Knock 2 | — | W23 | — | 0.5 | OEM-X-69 | — | — | — |
| B9 | Knock 1 | — | W22 | — | 0.5 | OEM-X-70 | — | — | — |
OEM-X
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Fuel pump relay control | — | W38 | — | 0.5 | G4XXTREMEX-A-A21 | — | — | — |
| 13 | O2 sensor signal | — | W48 | — | 0.5 | G4XXTREMEX-A-A33 | — | — | — |
| 15 | Ground | — | W4 | — | 0.85 | SP-GND-1 | — | — | — |
| 16 | Crank position sensor (+) | — | W20 | — | 0.5 | G4XXTREMEX-A-A8 | — | — | — |
| 17 | Camshaft position sensor (Hall) | — | W21 | — | 0.5 | G4XXTREMEX-A-A9 | — | — | — |
| 2 | Idle speed control valve (close winding) | — | W41 | — | 0.5 | G4XXTREMEX-A-A18 | — | — | — |
| 23 | Ignition coil cylinder 4 | — | W27 | — | 0.5 | G4XXTREMEX-A-A10 | — | — | — |
| 24 | Ignition coil cylinder 6 | — | W29 | — | 0.5 | G4XXTREMEX-B-B12 | — | — | — |
| 25 | Ignition coil cylinder 5 | — | W28 | — | 0.5 | G4XXTREMEX-B-B13 | — | — | — |
| 26 | Battery voltage (constant +12V) | — | — | — | — | — | — | — | — |
| 27 | Main relay control | — | W39 | — | 0.5 | G4XXTREMEX-A-A20 | — | — | — |
| 28 | Ground (electronics + sensor shielding) | — | W12 | — | 0.5 | SP-0V-1 | — | — | — |
| 29 | Idle speed control valve (open winding) | — | W42 | — | 0.5 | G4XXTREMEX-A-A29 | — | — | — |
| 3 | Injector cylinder 5 | — | W34 | — | 0.5 | G4XXTREMEX-B-B4 | — | — | — |
| 31 | Injector cylinder 3 | — | W32 | — | 0.5 | G4XXTREMEX-A-A2 | — | — | — |
| 32 | Injector cylinder 2 | — | W31 | — | 0.5 | G4XXTREMEX-A-A3 | — | — | — |
| 33 | Injector cylinder 1 | — | W30 | — | 0.5 | G4XXTREMEX-A-A4 | — | — | — |
| 34 | Ground (output stages) | — | W5 | — | 0.85 | SP-GND-1 | — | — | — |
| 36 | Evap purge solenoid | — | W43 | — | 0.5 | G4XXTREMEX-A-A28 | — | — | — |
| 38 | O2 sensor heater relay control | — | W40 | — | 0.5 | G4XXTREMEX-A-A19 | — | — | — |
| 4 | Injector cylinder 6 | — | W35 | — | 0.5 | G4XXTREMEX-B-B3 | — | — | — |
| 40 | O2 sensor signal ground | — | W13 | — | 0.5 | SP-0V-1 | — | — | — |
| 41 | Mass air flow (MAF) signal | — | W46 | — | 0.5 | G4XXTREMEX-A-A17 | — | — | — |
| 42 | Vehicle speed signal | — | W51 | — | 0.5 | G4XXTREMEX-A-A30 | — | — | — |
| 43 | Crank position sensor (-) | — | W14 | — | 0.5 | SP-0V-1 | — | — | — |
| 44 | Sensor ground (IAT/ECT/TPS) | — | W15 | — | 0.5 | SP-0V-1 | — | — | — |
| 45 | Shield ground | — | W36 | — | 0.5 | SP-SHD-1 | — | — | — |
| 47 | Tachometer output | — | — | — | — | — | — | — | — |
| 5 | Injector cylinder 4 | — | W33 | — | 0.5 | G4XXTREMEX-A-A1 | — | — | — |
| 50 | Ignition coil cylinder 1 | — | W24 | — | 0.5 | G4XXTREMEX-A-A13 | — | — | — |
| 51 | Ignition coil cylinder 2 | — | W25 | — | 0.5 | G4XXTREMEX-A-A12 | — | — | — |
| 52 | Ignition coil cylinder 3 | — | W26 | — | 0.5 | G4XXTREMEX-A-A11 | — | — | — |
| 54 | ECU power (+14V from main relay) | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| 55 | Ground (ignition) | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| 56 | Ignition switch (terminal 15) | — | — | — | — | — | — | — | — |
| 59 | +5V sensor supply | — | W19 | — | 0.5 | G4XXTREMEX-A-A32 | — | — | — |
| 6 | Ground (injector output stages) | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| 69 | Knock sensor cylinders 4-6 | — | W23 | — | 0.5 | G4XXTREMEX-B-B8 | — | — | — |
| 7 | VANOS intake camshaft solenoid | — | W44 | — | 0.5 | G4XXTREMEX-A-A27 | — | — | — |
| 70 | Knock sensor cylinders 1-3 | — | W22 | — | 0.5 | G4XXTREMEX-B-B9 | — | — | — |
| 71 | Knock sensor ground/shield | — | W16 | — | 0.5 | SP-0V-1 | — | — | — |
| 73 | Throttle position (TPS) | — | W47 | — | 0.5 | G4XXTREMEX-A-A22 | — | — | — |
| 77 | Intake air temperature (IAT) | — | W50 | — | 0.5 | G4XXTREMEX-A-A16 | — | — | — |
| 78 | Engine coolant temperature (ECT) | — | W49 | — | 0.5 | G4XXTREMEX-A-A15 | — | — | — |
| 8 | Check engine light (MIL) | — | W45 | — | 0.5 | G4XXTREMEX-A-A26 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W12 | — | 0.5 | OEM-X-28 | — | — | — |
| 1 | — | — | W13 | — | 0.5 | OEM-X-40 | — | — | — |
| 1 | — | — | W14 | — | 0.5 | OEM-X-43 | — | — | — |
| 1 | — | — | W15 | — | 0.5 | OEM-X-44 | — | — | — |
| 1 | — | — | W16 | — | 0.5 | OEM-X-71 | — | — | — |
| 1 | — | — | W17 | — | 0.5 | G4XXTREMEX-A-A24 | — | — | — |
| 1 | — | — | W18 | — | 0.5 | G4XXTREMEX-B-B22 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-X-54 | — | — | — |
| 1 | — | — | W2 | — | 0.85 | G4XXTREMEX-A-A5 | — | — | — |
| 1 | — | — | W3 | — | 0.85 | G4XXTREMEX-B-B5 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W4 | — | 0.85 | OEM-X-15 | — | — | — |
| 1 | — | — | W5 | — | 0.85 | OEM-X-34 | — | — | — |
| 1 | — | — | W6 | — | 0.85 | OEM-X-55 | — | — | — |
| 1 | — | — | W7 | — | 0.85 | OEM-X-6 | — | — | — |
| 1 | — | — | W8 | — | 0.85 | G4XXTREMEX-A-A25 | — | — | — |
| 1 | — | — | W9 | — | 0.85 | G4XXTREMEX-A-A34 | — | — | — |
| 1 | — | — | W10 | — | 0.85 | G4XXTREMEX-B-B25 | — | — | — |
| 1 | — | — | W11 | — | 0.85 | G4XXTREMEX-B-B34 | — | — | — |
SP-SHD
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W36 | — | 0.5 | OEM-X-45 | — | — | — |
| 1 | — | — | W37 | — | 0.5 | G4XXTREMEX-A-A7 | — | — | — |
Pin map
| OEM point | OEM function | OEM family | Target point | Target function | Target family | Wire colour | Evidence |
|---|---|---|---|---|---|---|---|
| OEM-X-1 | Fuel pump relay control | low_side_out | G4XXTREMEX-A-A21 | Aux 1 | low_side_out | corroborated | |
| OEM-X-13 | O2 sensor signal | lambda_nb_in | G4XXTREMEX-A-A33 | Analog Volt 3 | analog_in | corroborated | |
| OEM-X-15 | Ground | ground | G4XXTREMEX-A-A25 + G4XXTREMEX-A-A34 + G4XXTREMEX-B-B25 + G4XXTREMEX-B-B34 | System Ground + System Ground + System Ground + System Ground | ground | corroborated | |
| OEM-X-16 | Crank position sensor (+) | trigger_in | G4XXTREMEX-A-A8 | Trigger 1 | trigger_in | corroborated | |
| OEM-X-17 | Camshaft position sensor (Hall) | trigger_in | G4XXTREMEX-A-A9 | Trigger 2 | trigger_in | corroborated | |
| OEM-X-2 | Idle speed control valve (close winding) | low_side_out | G4XXTREMEX-A-A18 | Aux 4 | low_side_out | corroborated | |
| OEM-X-23 | Ignition coil cylinder 4 | ignition_out | G4XXTREMEX-A-A10 | Ignition 4 | ignition_out | corroborated | |
| OEM-X-24 | Ignition coil cylinder 6 | ignition_out | G4XXTREMEX-B-B12 | Ignition 6 | ignition_out | corroborated | |
| OEM-X-25 | Ignition coil cylinder 5 | ignition_out | G4XXTREMEX-B-B13 | Ignition 5 | ignition_out | corroborated | |
| OEM-X-26 | Battery voltage (constant +12V) | power_in | — | — | — | corroborated | |
| OEM-X-27 | Main relay control | low_side_out | G4XXTREMEX-A-A20 | Aux 2 | low_side_out | corroborated | |
| OEM-X-28 | Ground (electronics + sensor shielding) | sensor_ground | G4XXTREMEX-A-A24 + G4XXTREMEX-B-B22 | Sensor Ground + Sensor Ground | sensor_ground | corroborated | |
| OEM-X-29 | Idle speed control valve (open winding) | low_side_out | G4XXTREMEX-A-A29 | Aux 5 | switch_out | corroborated | |
| OEM-X-3 | Injector cylinder 5 | injector_out | G4XXTREMEX-B-B4 | Injector 5 | injector_out | corroborated | |
| OEM-X-31 | Injector cylinder 3 | injector_out | G4XXTREMEX-A-A2 | Injector 3 | injector_out | corroborated | |
| OEM-X-32 | Injector cylinder 2 | injector_out | G4XXTREMEX-A-A3 | Injector 2 | injector_out | corroborated | |
| OEM-X-33 | Injector cylinder 1 | injector_out | G4XXTREMEX-A-A4 | Injector 1 | injector_out | corroborated | |
| OEM-X-34 | Ground (output stages) | ground | G4XXTREMEX-A-A25 + G4XXTREMEX-A-A34 + G4XXTREMEX-B-B25 + G4XXTREMEX-B-B34 | System Ground + System Ground + System Ground + System Ground | ground | corroborated | |
| OEM-X-36 | Evap purge solenoid | low_side_out | G4XXTREMEX-A-A28 | Aux 6 | switch_out | corroborated | |
| OEM-X-38 | O2 sensor heater relay control | low_side_out | G4XXTREMEX-A-A19 | Aux 3 | low_side_out | corroborated | |
| OEM-X-4 | Injector cylinder 6 | injector_out | G4XXTREMEX-B-B3 | Injector 6 | injector_out | corroborated | |
| OEM-X-40 | O2 sensor signal ground | sensor_ground | G4XXTREMEX-A-A24 + G4XXTREMEX-B-B22 | Sensor Ground + Sensor Ground | sensor_ground | corroborated | |
| OEM-X-41 | Mass air flow (MAF) signal | analog_in | G4XXTREMEX-A-A17 | Analog Volt 1 | analog_in | corroborated | |
| OEM-X-42 | Vehicle speed signal | digital_in | G4XXTREMEX-A-A30 | Digital Input 1 | digital_in | corroborated | |
| OEM-X-43 | Crank position sensor (-) | sensor_ground | G4XXTREMEX-A-A24 + G4XXTREMEX-B-B22 | Sensor Ground + Sensor Ground | sensor_ground | corroborated | |
| OEM-X-44 | Sensor ground (IAT/ECT/TPS) | sensor_ground | G4XXTREMEX-A-A24 + G4XXTREMEX-B-B22 | Sensor Ground + Sensor Ground | sensor_ground | corroborated | |
| OEM-X-45 | Shield ground | shield | G4XXTREMEX-A-A7 | Shield Ground | shield | corroborated | |
| OEM-X-47 | Tachometer output | tacho_out | — | — | — | corroborated | |
| OEM-X-5 | Injector cylinder 4 | injector_out | G4XXTREMEX-A-A1 | Injector 4 | injector_out | corroborated | |
| OEM-X-50 | Ignition coil cylinder 1 | ignition_out | G4XXTREMEX-A-A13 | Ignition 1 | ignition_out | corroborated | |
| OEM-X-51 | Ignition coil cylinder 2 | ignition_out | G4XXTREMEX-A-A12 | Ignition 2 | ignition_out | corroborated | |
| OEM-X-52 | Ignition coil cylinder 3 | ignition_out | G4XXTREMEX-A-A11 | Ignition 3 | ignition_out | corroborated | |
| OEM-X-54 | ECU power (+14V from main relay) | power_in | G4XXTREMEX-A-A5 + G4XXTREMEX-B-B5 | +14V ECU Power + Aux 9/10 E-Throttle Supply | power_in | corroborated | |
| OEM-X-55 | Ground (ignition) | ground | G4XXTREMEX-A-A25 + G4XXTREMEX-A-A34 + G4XXTREMEX-B-B25 + G4XXTREMEX-B-B34 | System Ground + System Ground + System Ground + System Ground | ground | corroborated | |
| OEM-X-56 | Ignition switch (terminal 15) | digital_in | — | — | — | corroborated | |
| OEM-X-59 | +5V sensor supply | vref | G4XXTREMEX-A-A32 | +5V Out | vref | corroborated | |
| OEM-X-6 | Ground (injector output stages) | ground | G4XXTREMEX-A-A25 + G4XXTREMEX-A-A34 + G4XXTREMEX-B-B25 + G4XXTREMEX-B-B34 | System Ground + System Ground + System Ground + System Ground | ground | corroborated | |
| OEM-X-69 | Knock sensor cylinders 4-6 | knock_in | G4XXTREMEX-B-B8 | Knock 2 | knock_in | corroborated | |
| OEM-X-7 | VANOS intake camshaft solenoid | low_side_out | G4XXTREMEX-A-A27 | Aux 7 | switch_out | corroborated | |
| OEM-X-70 | Knock sensor cylinders 1-3 | knock_in | G4XXTREMEX-B-B9 | Knock 1 | knock_in | corroborated | |
| OEM-X-71 | Knock sensor ground/shield | sensor_ground | G4XXTREMEX-A-A24 + G4XXTREMEX-B-B22 | Sensor Ground + Sensor Ground | sensor_ground | corroborated | |
| OEM-X-73 | Throttle position (TPS) | analog_in | G4XXTREMEX-A-A22 | Analog Volt 2 | analog_in | corroborated | |
| OEM-X-77 | Intake air temperature (IAT) | temp_in | G4XXTREMEX-A-A16 | Analog Temp 2 | temp_in | corroborated | |
| OEM-X-78 | Engine coolant temperature (ECT) | temp_in | G4XXTREMEX-A-A15 | Analog Temp 1 | temp_in | corroborated | |
| OEM-X-8 | Check engine light (MIL) | low_side_out | G4XXTREMEX-A-A26 | Aux 8 | switch_out | corroborated |
Cut list
| Wire | From | To | Gauge (mm²) | Colour | Length | Signal | Ident |
|---|---|---|---|---|---|---|---|
| W1 | OEM-X-54 | SP-14V-1 | 0.85 | no route | ECU power (+14V from main relay) | — | |
| W2 | SP-14V-1 | G4XXTREMEX-A-A5 | 0.85 | no route | +14V ECU Power | — | |
| W3 | SP-14V-1 | G4XXTREMEX-B-B5 | 0.85 | no route | Aux 9/10 E-Throttle Supply | — | |
| W4 | OEM-X-15 | SP-GND-1 | 0.85 | no route | Ground | — | |
| W5 | OEM-X-34 | SP-GND-1 | 0.85 | no route | Ground (output stages) | — | |
| W6 | OEM-X-55 | SP-GND-1 | 0.85 | no route | Ground (ignition) | — | |
| W7 | OEM-X-6 | SP-GND-1 | 0.85 | no route | Ground (injector output stages) | — | |
| W8 | SP-GND-1 | G4XXTREMEX-A-A25 | 0.85 | no route | System Ground | — | |
| W9 | SP-GND-1 | G4XXTREMEX-A-A34 | 0.85 | no route | System Ground | — | |
| W10 | SP-GND-1 | G4XXTREMEX-B-B25 | 0.85 | no route | System Ground | — | |
| W11 | SP-GND-1 | G4XXTREMEX-B-B34 | 0.85 | no route | System Ground | — | |
| W12 | OEM-X-28 | SP-0V-1 | 0.5 | no route | Ground (electronics + sensor shielding) | — | |
| W13 | OEM-X-40 | SP-0V-1 | 0.5 | no route | O2 sensor signal ground | — | |
| W14 | OEM-X-43 | SP-0V-1 | 0.5 | no route | Crank position sensor (-) | — | |
| W15 | OEM-X-44 | SP-0V-1 | 0.5 | no route | Sensor ground (IAT/ECT/TPS) | — | |
| W16 | OEM-X-71 | SP-0V-1 | 0.5 | no route | Knock sensor ground/shield | — | |
| W17 | SP-0V-1 | G4XXTREMEX-A-A24 | 0.5 | no route | Sensor Ground | — | |
| W18 | SP-0V-1 | G4XXTREMEX-B-B22 | 0.5 | no route | Sensor Ground | — | |
| W19 | OEM-X-59 | G4XXTREMEX-A-A32 | 0.5 | no route | +5V sensor supply | — | |
| W20 | OEM-X-16 | G4XXTREMEX-A-A8 | 0.5 | no route | Crank position sensor (+) | — | |
| W21 | OEM-X-17 | G4XXTREMEX-A-A9 | 0.5 | no route | Camshaft position sensor (Hall) | — | |
| W22 | OEM-X-70 | G4XXTREMEX-B-B9 | 0.5 | no route | Knock sensor cylinders 1-3 | — | |
| W23 | OEM-X-69 | G4XXTREMEX-B-B8 | 0.5 | no route | Knock sensor cylinders 4-6 | — | |
| W24 | OEM-X-50 | G4XXTREMEX-A-A13 | 0.5 | no route | Ignition coil cylinder 1 | — | |
| W25 | OEM-X-51 | G4XXTREMEX-A-A12 | 0.5 | no route | Ignition coil cylinder 2 | — | |
| W26 | OEM-X-52 | G4XXTREMEX-A-A11 | 0.5 | no route | Ignition coil cylinder 3 | — | |
| W27 | OEM-X-23 | G4XXTREMEX-A-A10 | 0.5 | no route | Ignition coil cylinder 4 | — | |
| W28 | OEM-X-25 | G4XXTREMEX-B-B13 | 0.5 | no route | Ignition coil cylinder 5 | — | |
| W29 | OEM-X-24 | G4XXTREMEX-B-B12 | 0.5 | no route | Ignition coil cylinder 6 | — | |
| W30 | OEM-X-33 | G4XXTREMEX-A-A4 | 0.5 | no route | Injector cylinder 1 | — | |
| W31 | OEM-X-32 | G4XXTREMEX-A-A3 | 0.5 | no route | Injector cylinder 2 | — | |
| W32 | OEM-X-31 | G4XXTREMEX-A-A2 | 0.5 | no route | Injector cylinder 3 | — | |
| W33 | OEM-X-5 | G4XXTREMEX-A-A1 | 0.5 | no route | Injector cylinder 4 | — | |
| W34 | OEM-X-3 | G4XXTREMEX-B-B4 | 0.5 | no route | Injector cylinder 5 | — | |
| W35 | OEM-X-4 | G4XXTREMEX-B-B3 | 0.5 | no route | Injector cylinder 6 | — | |
| W36 | OEM-X-45 | SP-SHD-1 | 0.5 | no route | Shield ground | — | |
| W37 | SP-SHD-1 | G4XXTREMEX-A-A7 | 0.5 | no route | Shield Ground | — | |
| W38 | OEM-X-1 | G4XXTREMEX-A-A21 | 0.5 | no route | Fuel pump relay control | — | |
| W39 | OEM-X-27 | G4XXTREMEX-A-A20 | 0.5 | no route | Main relay control | — | |
| W40 | OEM-X-38 | G4XXTREMEX-A-A19 | 0.5 | no route | O2 sensor heater relay control | — | |
| W41 | OEM-X-2 | G4XXTREMEX-A-A18 | 0.5 | no route | Idle speed control valve (close winding) | — | |
| W42 | OEM-X-29 | G4XXTREMEX-A-A29 | 0.5 | no route | Idle speed control valve (open winding) | — | |
| W43 | OEM-X-36 | G4XXTREMEX-A-A28 | 0.5 | no route | Evap purge solenoid | — | |
| W44 | OEM-X-7 | G4XXTREMEX-A-A27 | 0.5 | no route | VANOS intake camshaft solenoid | — | |
| W45 | OEM-X-8 | G4XXTREMEX-A-A26 | 0.5 | no route | Check engine light (MIL) | — | |
| W46 | OEM-X-41 | G4XXTREMEX-A-A17 | 0.5 | no route | Mass air flow (MAF) signal | — | |
| W47 | OEM-X-73 | G4XXTREMEX-A-A22 | 0.5 | no route | Throttle position (TPS) | — | |
| W48 | OEM-X-13 | G4XXTREMEX-A-A33 | 0.5 | no route | O2 sensor signal | — | |
| W49 | OEM-X-78 | G4XXTREMEX-A-A15 | 0.5 | no route | Engine coolant temperature (ECT) | — | |
| W50 | OEM-X-77 | G4XXTREMEX-A-A16 | 0.5 | no route | Intake air temperature (IAT) | — | |
| W51 | OEM-X-42 | G4XXTREMEX-A-A30 | 0.5 | no route | Vehicle speed signal | — |
Bill of materials
| Category | Part number | Manufacturer | Description | Qty | Unit |
|---|---|---|---|---|---|
| connector | BMW-E36-DME-CONN | BMW | E36 DME (M3.1/M3.3.1) 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 (5)
| Severity | Code | Subject | Message |
|---|---|---|---|
| info | NET_FAMILY | OEM-X-29 ↔ G4XXTREMEX-A-A29 | OEM-X-29 "Idle speed control valve (open winding)" [low_side_out] is wired to G4XXTREMEX-A-A29 "Aux 5" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-X-36 ↔ G4XXTREMEX-A-A28 | OEM-X-36 "Evap purge solenoid" [low_side_out] is wired to G4XXTREMEX-A-A28 "Aux 6" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-X-7 ↔ G4XXTREMEX-A-A27 | OEM-X-7 "VANOS intake camshaft solenoid" [low_side_out] is wired to G4XXTREMEX-A-A27 "Aux 7" [switch_out]. Configure this output as low side. |
| info | NET_FAMILY | OEM-X-8 ↔ G4XXTREMEX-A-A26 | OEM-X-8 "Check engine light (MIL)" [low_side_out] is wired to G4XXTREMEX-A-A26 "Aux 8" [switch_out]. Configure this output as low side. |
| info | UNMAPPED | OEM | 2 optional OEM pins are not mapped: OEM-X-47 Tachometer output; OEM-X-56 Ignition switch (terminal 15) |
Accepted (1)
| Code | Subject | Reason | By |
|---|---|---|---|
| REQUIRED_UNMAPPED | OEM-X-26 | Battery-constant (memory) feed of the stock ECU: the new ECU has no such input, so it is not needed. | mapping-proposal |
Notes
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-X 26: Battery voltage (constant +12V): Link G4X XtremeX has no battery-constant input; not needed - OEM-X 56: Ignition switch (terminal 15): key-on 12 V sense — optional in a swap (the main relay is energized from keyed 12 V, not from this pin); Link G4X XtremeX has no dedicated key-on input - OEM-X 47: Tachometer output: no free tacho/frequency_out/low_side/ls_hs on Link G4X XtremeX
Sources
| Reliability | Kind | Title | URL | Archive | Captured | SHA-256 |
|---|---|---|---|---|---|---|
| 4 | vendor_doc | Link BMWLink E36X (G4X) plug-in install manual | https://linkecu.com/documentation/E36X.pdf | archive | 2026-10-05 | 010cda3acd08 |
| 4 | vendor_doc | Link: G4X XtremeX quickstart guide | https://linkecu.com/documentation/XtremeXQuickstartGuide.pdf | — | — | — |
| 3 | community_copy | YourSpec: Link G4X XtremeX flying-lead harness wiring list | https://wpm.yourspec.com/projects/view/1488 | — | — | — |
| 2 | community_copy | bimmer-service: Bosch Motronic M3.3.1 pinout (E36 M50) | https://www.bimmer-service.com/2025/11/17/bosch-motronic-m3-3-1-pinout-wiring-diagram/ | — | — | — |