B2558

DTC B2558

DTC B2558

DTC B2558
- Passenger Compartment Lamp Control Circuit High

Diagnostic Fault Information

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview





Circuit/System Description

When the headlamp switch is turned to the HEADLAMPS or Parking Lamps position, the body control (BCM) applies battery positive voltage to the instrument panel (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

* The interior lights are commanded ON by the BCM.
* At least one door is open.

Conditions for Setting the DTC

The interior lamp control circuit is shorted to B+ voltage for 1 second.

Action Taken When the DTC Sets

The BCM disables the interior lamp control output for the remainder of the ignition cycle.

Conditions for Clearing the DTC

* A current DTC B2558 clears when the BCM no longer detects a short to battery positive voltage in the control circuit on the interior lamp circuit.
* 100 consecutive ignition cycles have been recorded without the DTC being detected.
* Using a scan tool can clear the DTC.

Diagnostic Aids

* If the DTC is a history DTC, the problem 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 in the courtesy lamp low control circuit.
- The BCM is intermittently shorted to battery positive voltage.

Circuit/System Verification

Ignition ON, Engine OFF,Turn the I/P dimmer switch to the door position, With a Scan Tool Command the Interior Lamps ON and OFF. The footwell and courtesy lamps should turn ON and OFF.

Circuit/System Testing

1. Ignition OFF, disconnect the Courtesy Lamp Low Control circuit of the BCM C3 pin 11 harness connector.
2. Ignition ON, verify that a test lamp illuminates between the Courtesy Lamp Low Control circuit signal terminal C3 pin 11 of the BCM and ground.

• If the test lamp does not illuminate, test the Courtesy Lamp Low Control circuit signal terminal C3 pin 11 of the BCM for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the signal circuit BCM terminal C3 pin 11 for a short to ground.

3. Verify the scan tool Interior Lights parameter is OFF.

• If not the specified value, test the signal circuit terminal BCM C3 pin 11 for a short to voltage. If the circuit tests normal, replace the BCM.

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

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Refer to Programming and Learning Programming and Relearning