B1482
CIRCUIT DESCRIPTIONWhen the headlamp switch is turned to the PARK or HEAD position, the body control module (BCM) applies battery positive voltage to the I/P courtesy lamps. When a door is opened, the door latch assembly applies a ground to the BCM. The BCM supplies battery positive voltage to the courtesy lamp supply voltage circuit and applies a ground to the courtesy lamps control circuit.
CONDITIONS FOR RUNNING THE DTC
Voltage supplied to the BCM is in the normal operating range, approximately 9 - 14 volts.
CONDITIONS FOR SETTING THE DTC
^ The BCM detects a low when a high is expected in either the instrument panel lamps supply voltage circuit or the courtesy lamp supply voltage circuit.
^ The condition above must be present for more then 0.1 seconds.
ACTION TAKEN WHEN THE DTC SETS
^ The BCM L Fuse opens.
^ The courtesy lamps are inoperative.
^ The I/P courtesy lamps are inoperative.
^ The BCM stores DTC B1482 in memory.
^ The BCM store DTC B2627 in memory.
CONDITIONS FOR CLEARING THE MIL/DTC
^ A current DTC B1482 and B2627 clears when the BCM no longer detects a short to ground in the instrument panel lamps supply voltage circuit or the courtesy lamps supply voltage circuit.
^ A history DTC B1482 and B2627 clears after 100 consecutive ignition cycles.
DIAGNOSTIC AIDS
^ The BCM L Fuse opens when there is a short to ground in either the instrument panel lamps supply voltage circuit or the courtesy lamps supply voltage circuit and must be replaced before doing any diagnostics.
^ If the DTC B1482 or B2627 is a history DTC, the fault may be intermittent. Refer to Testing for Intermittent and Poor Connections in Diagnostic Aids.
^ The following conditions may cause an intermittent malfunction to occur:
- An intermittent short to ground in the instrument panel lamps supply voltage circuit or the courtesy lamps supply voltage circuit.
- The BCM is intermittently shorted to ground.
TEST
