B2625

DTC B2625

CIRCUIT DESCRIPTION
The body control module (BCM) receives a variable voltage signal from the instrument panel (I/P) dimmer switch requesting to illuminate the dimming lamps to a desired intensity. When this occurs, the BCM directly sends a pulse width modulated (PWM) voltage based on the I/P dimmer switch position through the LED dimming signal circuit to the various On/Off switches.

CONDITIONS FOR RUNNING THE DTC
The battery voltage must be between 9.0-16.0 volts.

CONDITIONS FOR SETTING THE DTC
When the BCM receives a instrument panel lamps illumination request signal and the LED dimming signal circuit is shorted to ground.

ACTION TAKEN WHEN THE DTC SETS
The dimming lamps will not operate.

CONDITIONS FOR CLEARING THE MIL/DTC
- This DTC will clear on current status after the condition for setting the fault is corrected.
- A history DTC will clear after 100 consecutive ignition cycles without a fault present.
- History and current DTC(s) can be cleared using a scan tool.

DIAGNOSTIC AIDS
Perform a visual inspection for loose or poor connections at all related components.

TEST DESCRIPTION

Steps 1-4:

The numbers below refer to the step numbers on the diagnostic table.
2. This step test determines if the problem exists in the wiring or the BCM.
3. After replacement of the BCM you must calibrate the new module for proper operation.