Diagnostic Aids

If the DTC is a history DTC, the problem may be intermittent. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
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.

DTC B2558

Step	Action	Yes	No
Schematic Reference: Interior Lights Schematics Connector End View Reference: Master Electrical Component List in Wiring Systems
1	Did you perform the Lighting System Diagnostic System Check?	Go to Step 2	Go to Diagnostic System Check - Lighting Systems
2	Install a scan tool. Turn the ignition to the ON position with the engine OFF. Turn the I/P dimmer switch to the door position. With a scan tool, command the courtesy lamps ON and OFF. Do the courtesy lamps turn ON and OFF with each command?	Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems	Go to Step 3
3	Turn the ignition to the OFF position. Disconnect the BCM connector C3. Turn the I/P dimmer switch the OFF position. Using a test lamp connected to ground, probe the courtesy lamp low control circuit at the BCM connector C3. Does the test light illuminate?	Go to Step 5	Go to Step 4
4	Inspect for poor connections at the harness connector of the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 7	Go to Step 6
5	Repair the short to battery positive voltage in the courtesy lamp low control circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair?	Go to Step 7	-
6	IMPORTANT: Perform the setup procedure for the Body Control Module. Refer to Body Control Module (BCM) Programming/RPO Configuration in Body Control System. Replace the body control module. Refer to Body Control Module Replacement in Body Control System.Did you complete the replacement?	Go to Step 7	-
7	Use the scan tool in order to clear the DTCs. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text. Does the DTC reset?	Go to Step 2	System OK