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 |
|---|---|---|---|---|
RAP/ACCY Relay B+ | 1 | 1 | -- | -- |
Off Road Roof Lamp Relay B+ | 3 | 3 | -- | -- |
Off Road Grille Lamps Relay B+ | 1 | 1 | -- | -- |
RAP Relay Coil Control | 1 | 1 | 1 | -- |
Off Road Roof Lamp Control | 3 | 3 | 3 | -- |
Off Road Roof Lamp Switch Control | -- | 3,4 | 3,4 | -- |
Off Road Grille Lamps Switch Control | -- | 1,2 | 1,2 | -- |
Off Road Grille Lamps Relay Control | 1,2 | 1,2 | 1,2 | -- |
Off Road Grille Lamps Ground | -- | 1 | 1 | -- |
Off Road Grille Lamps Switch Ground | -- | 2 | 2 | -- |
Off Road Roof Lamp Ground | -- | 3 | 3 | -- |
Off Road Roof Lamp Switch Ground | -- | 4 | 4 | -- |
1. Off Road Lamp Malfunction 2. Off Road Lamp Switch Malfunction 3. Off Road Roof Lamp Malfunction 4. Off Road Roof Lamp Switch Malfunction | ||||
Circuit/System Description
The off-road lamps are dealer installed and can be purchased in different applications with lights mounted on the roof and on the front brush guard. Voltage is supplied to the Off Road Grille Lamp Relay or Off Road Roof Lamp Relay at all times. The appropriate relay is then supplied ground through the Off Road Grille or Roof Lamp Switch, energizing the appropriate relay. Voltage is then applied to the Off Road Grille or Roof Lamps. The lamps are controlled by rocker type switches located on the instrument panel.
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Exterior Lighting Systems Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Ignition ON, turn the roof or grille lamp switch on and verify that both exterior lamps and switch indicator illuminate.
Circuit/System Testing
Off Road Grille Lamps and Roof Lamps Malfunction
- Ignition OFF, disconnect the appropriate relay.
- Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 85 and ground.
- Verify that a test lamp illuminates between the B+ circuit terminal 86 and ground.
- Verify that a test lamp illuminates between the B+ circuit terminal 30 and ground.
- Disconnect the harness connector at the appropriate lamp.
- Test for less than 1 ohm between the ground circuit terminal B and ground.
- Connect the harness connector at the appropriate lamp.
- Connect a 20A fused jumper wire between the B+ circuit terminal 30 and the control circuit terminal 87. Verify the test lamp is illuminated.
- Connect a test lamp between the B+ circuit terminal 86 and the control circuit terminal 85.
- Turn the switch ON and OFF. The test lamp should turn ON and OFF.
- If all circuits test normal, test or replace the appropriate relay.
| ⇒ | If the test lamp illuminates, test the control circuit for a short to voltage. |
| ⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal, and the B+ circuit fuse is open, test the control circuit terminal 87 for a short to ground. If the circuit tests normal, test or replace the relay. |
| ⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. |
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| ⇒ | If the lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the appropriate lamp. |
| ⇒ | If the test lamp is always ON, test the control circuit terminal 85 for a short to ground. If the circuit tests normal, replace the appropriate switch. |
| ⇒ | If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the appropriate switch. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
