The body control module (BCM) receives an input from the instrument panel (I/P) dimmer switch. The BCM provides the I/P dimmer switch with voltage and a low reference. The I/P dimmer switch is a potentiometer that varies the input signal voltage to the BCM. This input determines the intensity level of the backlighting illumination. The driver may change intensity of the backlighting by positioning the I/P dimmer switch between the minimum and maximum settings. The BCM will default to full intensity if the input from the I/P dimmer switch is not within the specified values. The backlighting illumination intensity is controlled by the BCM by varying the pulse width modulation (PWM) voltage that feeds the dimming signal circuits of the individual lamps. All interior backlighting lamps are permanently grounded.

Battery voltage must be between 9-16 volts.

DTC B2625 02 will set when the BCM detects a short to ground in the instrument panel lamps supply voltage circuit.

When DTC B2625 02 is present, the interior backlighting will not operate.

Schematic Reference

Interior Lights Dimming Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Interior Lighting Systems Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

1. Ignition OFF, disconnect the harness connectors at all components fed by the I/P lamps supply voltage circuit.
2. Verify DTC B2625 02 is not set.

⇒	If the DTC sets as current, test the I/P lamps control circuit for a short to ground. If the circuit tests normal, replace the BCM.

3. Ignition OFF, connect each component fed by the I/P lamps control circuit one at a time and verify each time that the DTC does is set.

⇒	If the sets, replace the component that caused the DTC to set.

4. If all circuits test normal, replace the BCM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.