B2625
DTC B2625
Circuit Description
The body control module (BCM) monitors the instrument panel (I/P) lamps dimming control circuit to determine the lighting intensity of the I/P lamps. When the BCM receives a varied voltage signal on the I/P lamps dimming control circuit, it applies a corresponding pulse width modulated (PWM) voltage signal through the I/P lamps supply voltage circuit to all the I/P lamps.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B2625 Display Dimming Pulse Width Modulation (PWM) Output Circuit
Conditions for Running the DTC
* Voltage supplied to the BCM is in the normal operating range, approximately 9-14 volts.
* The ignition switch must be in the ACCESSORY or RUN position.
* The park lamps must be ON.
Conditions for Setting the DTC
* The BCM detects a short to ground in the instrument panel lamp supply voltage circuit.
* The above condition must be present for more than 1 second.
Action Taken When the DTC Sets
* The I/P courtesy lamps are inoperative.
* The BCM store DTC B2625 in memory.
Conditions for Clearing the MIL/DTC
* A current DTC B2625 clears when the BCM no longer detects a short to ground in the I/P lamps supply voltage circuit.
* A history DTC B2625 clears after 100 consecutive ignition cycles.
Diagnostic Aids
* If the DTC B2627 is a history DTC, the fault may be intermittent. Refer to Testing for Intermittent Conditions and Poor Connections. Component Tests and General Diagnostics
* The following conditions may cause an intermittent malfunction to occur:
- An intermittent short to ground in the instrument panel lamps supply voltage circuit.
- The BCM is intermittently shorted to ground.
Test
