Electrical Components

Verify customer complaint. Visually inspect the following electrical components of the shift lock system:

• Fuses No. 17, 33 or 35 (15-amp).
• Open or shorted circuits.
• Loose or damaged connections.
• Brake Pedal Position (BPP) switch connections.

1. Check Brakelight Operation
   
   Apply brake pedal and hold. If brakelights illuminate, go to next step. If brakelights do not illuminate, diagnose BPP switch and brakelight circuits. See EXTERIOR LIGHTS article in ACCESSORIES & EQUIPMENT.
2. Check VPWR Circuit (Light Green Wire) To Shift Lock Actuator For Voltage
   
   Disconnect shift lock actuator 3-pin connector. Apply brake pedal and hold. Using DVOM, measure voltage between chassis ground and shift lock actuator harness connector terminal No. 1 (Light Green wire). If voltage is present with brake pedal applied, go to next step. If voltage is not present with brake pedal applied, repair faulty fuse No. 35 (15-amp), or open or short to ground in Light Green wire. See WIRING DIAGRAMS . Reconnect all connectors and retest system.
3. Check VPWR Circuit (White/Light Blue Wire) To Shift Lock Actuator For Voltage
   
   Using DVOM, measure voltage between chassis ground and shift lock actuator harness connector terminal No. 3 (White/Light Blue wire). If battery voltage is present, go to next step. If battery voltage is not present, repair faulty fuse No. 17 (15-amp), or open or short to ground in White/Light Blue wire. See WIRING DIAGRAMS . Reconnect all connectors and retest system.
4. Check Ground Circuit (Black Wire) To Shift Lock Actuator For Open
   
   Using DVOM, measure resistance between chassis ground and shift lock actuator harness connector terminal No. 2 (Black wire). If resistance is less than 5 ohms, replace shift lock actuator. If resistance is 5 ohms or more, repair open in Black wire. See WIRING DIAGRAMS . Reconnect all connectors and retest system.