B2628
DTC B2628
Circuit Description
The body control module (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
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B2628 Display Dimming Pulse Width Modulation Output Circuit High
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. Component Tests and General Diagnostics
* 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
TEST
