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
