For 1990-2009 cars

Connector 1: | Electronic Power Steering (EPS) Control Module C1
Connector 2: | Electronic Power Steering (EPS) Control Module C2
Connector 3: | Power Steering Control Module (PSCM) C3

### Electronic Power Steering (EPS) Control Module C1

#### Connector Part Information

- OEM: 10721337
- Service: 88953301
- Description: 2-Way F 375 58 (BK)

#### Terminal Part Information

- Terminal/Tray: 7116-3251/10
- Core/Insulation Crimp: See Terminal Repair Kit
- Release Tool/Test Probe: 12094430/J-35616-22 (RD)

#### Electronic Power Steering (EPS) Control Module C1

Pin | Wire Color | Circuit No. | Function
--- | --- | --- | ---
1 | RD/BK | 642 | Battery Positive Voltage
2 | BK | 1150 | Ground

### Electronic Power Steering (EPS) Control Module C2

#### Connector Part Information

- OEM: 15438391
- Service: 88988409
- Description: 6-Way F 040 (GY)

#### Terminal Part Information

- Terminal/Tray: 173681-2/17
- Core/Insulation Crimp: E/4
- Release Tool/Test Probe: 15315247/J-35616-16 (L-GN)

#### Electronic Power Steering (EPS) Control Module C2

Pin | Wire Color | Circuit No. | Function
--- | --- | --- | ---
1 | TN/BK | 2500 | High Speed GMLAN Serial Data Bus (+)
2 | TN | 2501 | High Speed GMLAN Serial Data Bus (-)
3 | -- | -- | Not Used
4 | BN/WH | 2500 | High Speed GMLAN Serial Data Bus (+)
5 | BN | 2501 | High Speed GMLAN Serial Data Bus (-)
6 | PK | 1539 | Ignition 1 Voltage

### Power Steering Control Module (PSCM) C3

#### Connector Part Information

- OEM: 7123-4123-30
- Service: 88953301
- Description: 2-Way F (BU)

#### Terminal Part Information

- Terminal/Tray: See Terminal Repair Kit
- Core/Insulation Crimp: See Terminal Repair Kit
- Release Tool/Test Probe: See Terminal Repair Kit

#### Power Steering Control Module (PSCM) C3

Pin | Wire Color | Circuit No. | Function
--- | --- | --- | ---
+ | RD | 5 | Motor Control
- | BK | 5 | Motor Control