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 Lamp Voltage Supply | 4 | 4 | 3 | -- |
Park Lamp Relay Control | 3 | 4 | 4 | -- |
Park Lamp Switch ON signal | 3 | 4 | 4 | -- |
License Lamp Supply Voltage | 1 | 1 | 3 | -- |
Marker Lamp Voltage Supply | 2 | 2 | 3 | -- |
License Lamp Ground | -- | 1 | 4 | -- |
Marker Lamp Ground | -- | 2 | 4 | -- |
Park/Turn Signal/DRL Lamps - LF Ground | -- | 4 | 4 | -- |
Park/Turn Signal/DRL Lamps - RF Ground | -- | 4 | 4 | -- |
Tail/Stop and Turn Signal Lamps - LR Ground | -- | 4 | 4 | -- |
Tail/Stop and Turn Signal Lamps - RR Ground | -- | 4 | 4 | -- |
Turn Signal/Multifunction Switch Ground | -- | 4 | 4 | -- |
1. License Lamps Inoperative 2. Marker Lamps Inoperative 3. Park Lamps Always On 4. Park Lamps Inoperative | ||||
Circuit/System Description
Battery voltage is applied at all times to the coil and switch sides of the PARK LAMP Relay located in the underhood fuse block. Ground is applied at G201 to the turn signal/multifunction switch at all times. When the headlamp switch is placed in either the HEAD or PARK position, ground is applied to the park lamp switch signal circuit to the body control module (BCM). The BCM reacts to the signal from the park lamp switch by applying ground to the park lamp relay control circuit. This energizes the PARK LAMP Relay and applies battery voltage to the PARK LPS fuse. Voltage flows through the PARK LPS fuse to all park, tail, license, and side marker lamps. Ground for the front park and side marker lamps is supplied at G101 for the left and G102 for the right. Ground for the license and right rear tail lamps is supplied at G402, and the left rear tail lamps at G400.
Reference Information
Schematic Reference
Connector End View Reference
Lighting Systems Connector End Views
Electrical Information Reference
Scan Tool Reference
Circuit/System Testing
- Ignition OFF, disconnect the inoperative side marker lamp harness connector.
- Ignition ON, turn ON the park lamps.
- Verify that a test lamp illuminates between the side marker lamp supply voltage circuit and ground.
- If all circuits test normal, test or replace the inoperative side marker lamp.
| ⇒ | If the test lamp does not illuminate, test for a short to ground or an open/high resistance in the side marker lamp supply voltage circuit. |
| ⇒ | If the test lamp illuminates, test for a short to voltage or an open/high resistance in the side marker lamp ground circuit. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
