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 |
|---|---|---|---|---|
Accent Lamp Signal - Driver Door Module | 1 | 1 | 1 | -- |
Accent Lamp Signal - Passenger Door Module | 1 | 1 | 1 | -- |
Accent Lamp Control | B261A 02 | 1 | 1 | -- |
Accent Lamp Driver Door Ground | -- | 1 | -- | -- |
Accent Lamp Driver Door Handle Ground | -- | 1 | -- | -- |
Accent Lamp Passenger Door Ground | -- | 1 | -- | -- |
Accent Lamp Passenger Door Handle Ground | -- | 1 | -- | -- |
Accent Lamp Left I/P Ground | -- | 1 | -- | -- |
Accent Lamp Lower Left I/P Ground | -- | 1 | -- | -- |
Accent Lamp Left Rear Door Ground | -- | 1 | -- | -- |
Accent Lamp Left Rear Door Handle Ground | -- | 1 | -- | -- |
Accent Lamp Driver Seat Ground | -- | 1 | -- | -- |
Accent Lamp Overhead Console Ground | -- | 1 | -- | -- |
Accent Lamp Right I/P Ground | -- | 1 | -- | -- |
Accent Lamp Lower Right I/P Ground | -- | 1 | -- | -- |
Accent Lamp Right Rear Door Ground | -- | 1 | -- | -- |
Accent Lamp Right Rear Door Handle Ground | -- | 1 | -- | -- |
Accent Lamp Passenger Seat Ground | -- | 1 | -- | -- |
1. Interior Accent Lighting Malfunction | ||||
Circuit/System Description
The instrument panel (I/P) dimmer switch is used to increase and decrease the brightness of the interior backlighting components. The I/P dimmer switch provides a voltage signal that will increase as the brightness of the light are increased and decrease as the brightness of the lights are decreased. The body control module (BCM) provides a low reference signal and a B+ voltage reference to the I/P dimmer switch. When the I/P dimmer switch is placed in the desired position, the dimmed voltage setting is applied from the I/P dimmer switch through the I/P dimmer switch signal circuit to the BCM. The BCM interprets the signal and applies the dimmed voltage to the individual accent lamps via the accent lamps control circuit. The BCM also sends a serial data message to the driver and front passenger door control modules requesting the accent lamps on both doors be dimmed to the requested level. The driver and front passenger door modules respond by applying the appropriate voltage for the requested dim level to the accent lights.
Reference Information
Schematic Reference
Interior Lights Dimming Schematics
Connector End View Reference
Description and Operation
Interior Lighting Systems Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Ignition ON, observe the scan tool Dimming Control Signal parameter while operating the dimmer switch from high to low. The reading should change from a high percent to a low percent as the switch is activated.
- Ignition ON, park lamps ON, observe the accent lamps located on the driver and front passenger doors. All door accent lamps should be illuminated.
| ⇒ | If the reading does not change, refer to Interior Backlighting Malfunction. |
| ⇒ | If the driver or front passenger door accent lamps are not illuminated, refer to Accent Lamps Malfunction - Front Doors. |
Circuit/System Testing
Accent Lamps Malfunction
- Ignition OFF, disconnect the harness connector at the inoperative accent lamp.
- Ignition OFF, test for less than 5.0 ohms between the ground circuit terminal and ground.
- Ignition OFF, park lamps OFF, verify that a test lamp does not illuminate between the control circuit terminal and ground.
- Ignition ON, park lamps ON, verify that a test lamp illuminates between the control circuit terminal and ground.
- If all circuits test normal, replace the inoperative accent lamp.
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| ⇒ | If the test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM. |
| ⇒ | If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM. |
Accent Lamps Malfunction - Front Doors
- Ignition OFF, disconnect the harness connector at the inoperative door accent lamp.
- Ignition OFF, verify that a test lamp illuminates between B+ and the ground circuit terminal A.
- Ignition OFF, park lamps OFF, verify that a test lamp does not illuminate between the control circuit terminal B and ground.
- Ignition ON, park lamps ON, verify that a test lamp illuminates between the control circuit terminal and ground.
- If all circuits test normal, replace the inoperative accent lamp.
| ⇒ | If the test lamp does not illuminate, test the ground circuit for an open/high resistance. |
| ⇒ | If the test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal, replace the appropriate door control module. |
| ⇒ | If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the appropriate door control module. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for BCM, DDM, or PDM replacement, setup, and programming |
