Circuit Description
The BCM controls the illumination of the following lamps through pulse width modulation when the park lamps or the headlamps are ON:
| • | The automatic transmission control position illumination lamp |
| • | The left glass window release switch illumination lamp |
| • | The electronic traction control switch illumination lamp |
| • | The door lock theft deterrent defeat switch illumination lamp |
| • | The heater A/C control switch illumination lamp |
| • | The instrument cluster illumination lamps |
| • | The headlamp switch illumination lamp |
| • | The radio switches illumination lamps |
| • | The driver information display switch illumination lamp |
| • | The heated seat switch illumination lamp |
| • | The door lock switches illumination lamps |
| • | The window switches illumination lamps |
| • | The steering wheel controls illumination lamps |
Conditions for Running the DTC
Voltage supplied to the module is in the normal operating range (approximately 10-16 volts).
Conditions for Setting the DTC
| • | The BCM detects a short to voltage in the instrument panel lamps supply voltage circuit. When the park lamps or the headlamps are on, and the dimmer switch is in the OFF position. |
| • | The condition is present for more than 3 ms. |
Action Taken When the DTC Sets
The BCM stores DTC B2628 in memory.
Conditions for Clearing the MIL/DTC
| • | A current DTC B2628 clears if the BCM no longer detects a short to battery positive voltage in the instrument panel lamps supply voltage circuit of the illumination lamps. |
| • | A history DTC B2628 clears after 100 consecutive ignition cycles if the condition is no longer present. |
| • | The BCM receives the Clear Code command from the scan tool. |
Diagnostic Aids
| • | If the DTC B2628 is a history DTC, the fault may be intermittent. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems. |
| • | An intermittent short to voltage in the following conditions may cause an intermittent malfunction to occur: |
| - | The instrument panel lamps supply voltage circuit of the illumination lamps |
| - | The BCM |
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Interior Lights Schematics | |||
1 | Did you perform the Diagnostic System Check? | Go to Step 2 | |
2 | Do the instrument panel lamps turn ON with the headlamp switch in the PARK position? | Go to Diagnostic Aids | Go to Step 3 |
3 |
Do the test lamp illuminate? | Go to Step 4 | Go to Step 5 |
4 | Repair a short to battery positive voltage in the instrument panel lamps supply voltage circuit of the illumination lamps. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 6 | -- |
5 |
Important: Perform the set up procedure for the body control module (BCM). Refer to Body Control Module (BCM) Programming/RPO Configuration in Body Control Systems. Replace the BCM. Refer to Body Control Module Replacement in Body Control System. Did you complete the replacement? | Go to Step 6 | -- |
6 |
Does the DTC reset? | System OK | Go to Step 3 |
