B2558

DTC B2558

CIRCUIT DESCRIPTION




When 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 low control circuit.

CONDITIONS FOR RUNNING THE DTC
At least one of the following conditions must exist:
- At least one door is open.
- The interior lamps are commanded on by the BCM.

CONDITIONS FOR SETTING THE DTC
- The interior lamps are commanded on by the BCM.
- The interior lamp control circuit is shorted to battery positive voltage for 0.1 seconds.

ACTION TAKEN WHEN THE DTC SETS
- DTC B2558 is stored in the BCM memory.
- The BCM disables the interior lamp control output for the remainder of the ignition cycle.

CONDITIONS FOR CLEARING THE DTC
- The conditions for setting the DTC are no longer present.
- A history DTC clears after 100 malfunction free ignition cycles.
- The BCM receives the clear code command from the scan tool.

DIAGNOSTIC AIDS
- If the DTC is a history DTC, the problem may be intermittent.
- The following conditions may cause an intermittent malfunction to occur:
- An intermittent in the courtesy lamp low control circuit.
- The BCM is intermittently shorted to battery positive voltage.

TEST

Steps 1-7: