Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptor
DTC B2558: Passenger Compartment Lamp Control Circuit HighDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Interior Lamp Control Circuit | -- | -- | B2558 01 | |
BCM | -- | -- | B2558 01 |
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 . |
| • | 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. |
Reference Information
Schematic Reference
Connector End View Reference
Master Electrical Component List
Electrical Information Reference
Scan Tool Reference
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
- Ignition OFF, disconnect the Courtesy Lamp Low Control circuit of the BCM C3 pin 11 harness connector.
- 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.
- Verify the scan tool Interior Lights parameter is OFF.
- If all circuits test normal, test or replace the BCM.
| ⇒ | 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. |
| ⇒ | 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. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for BCM replacement, setup and programming
