Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Park/Tail Lamp Control | 1, 3 | 1, 3 | 2, 4 | -- |
Left Park/Tail Lamp Control | 1 | 1 | 2 | -- |
Right Park/Tail Lamp Control | 3 | 3 | 4 | -- |
Ground - Park or Tail Lamp | -- | 1, 3 | -- | -- |
1. Left park/tail lamps inoperative 2. Left park/tail lamps always ON 3. Right park/tail lamps inoperative 4. Right park/tail lamps always ON | ||||
Circuit/System Description
Battery voltage from the PRK LAMPS Fuse (C4/C5) or Circuit Breaker 3 (C6/C7/C8) located in the I/P-1 fuse block is supplied at all times to the headlamp switch. When the headlamp switch is in the PARK position, battery voltage is applied through the park lamp supply voltage circuit, the LT and RT PARK Fuses (C4/C5) or Circuit Breakers (C6/C7/C8) located in the I/P-2 fuse block, and the left and right park lamp supply voltage circuits illuminating the park lamps, tail lamps, and the interior non-dimming backlighting components. At the same time the park lamps indicator in the instrument panel cluster (IPC) is illuminated. Ground for all park and tail lamps is provided at G203.
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Ignition ON, command PARK lamps ON and OFF, using the headlamp switch. The park and tail lamps should turn ON and OFF when changing between commanded states.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the inoperative park or tail lamp assembly.
- Test for less than 1.0 ohm between the appropriate ground circuit terminal listed below and ground.
- Connect a test lamp between the appropriate control circuit terminal listed below and ground.
- Ignition ON, command park lamps ON and OFF using the headlamp switch. The test lamp should turn ON and OFF, when switching between commanded state.
- If all circuits test normal, test or replace the bulb or tail lamp assembly.
| • | Left or right front park/turn signal lamp terminal B |
| • | Left or right tail lamp assembly terminal E |
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| • | Left or right front park lamp terminal C |
| • | Left or right tail lamp assembly terminal B |
| ⇒ | If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit test normal, test or replace the headlamp switch. |
| ⇒ | If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit test normal, test or replace the headlamp switch. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
