The BCM controls the ground for the courtesy lamps through the courtesy lamp low control circuit. The BCM applies voltage to the courtesy lamps through the courtesy lamps supply voltage circuit. Ground for the courtesy lamps is applied from G201 to the BCM.
The BCM must command the courtesy lamp low control circuit on.
• | The BCM detects a high when the output should be low in the courtesy lamp low control circuit. |
• | The condition above must be present for more than 0.3 seconds. |
The BCM stores DTC B2618 in memory.
• | A current DTC B2618 will clear if the short to battery positive voltage in the courtesy lamp low control circuit is no longer detected by the BCM. |
• | A history DTC B2618 will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present and no other BCM faults are detected. |
• | The BCM receives a clear code command from the scan tool. |
• | If the DTC B2618 is a history DTC, the fault 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 short to battery positive voltage in the courtesy lamp low control circuit. |
- | The BCM is intermittently shorted to battery. |
The numbers below refer to the step numbers on the diagnostic table.
Watch for the courtesy lamps to illuminate. Command both the ON and OFF states. Repeat the commands as necessary.
Tests for short to battery positive voltage in the courtesy lamp low control circuit.
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 | |
Do the courtesy lamps turn ON and OFF with each command? | Go to Diagnostic Aids | Go to Step 3 | |
Does the test lamp illuminate? | Go to Step 4 | Go to Step 5 | |
4 | Repair the short to battery positive voltage in the courtesy lamp low control circuit of the BCM. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 6 | -- |
5 |
Important: Perform the set up procedure for the Body Control Module (BCM). Refer to Body Control Module (BCM) Programming/RPO Configuration in Body Control System. Replace the BCM. Refer to Body Control Module Replacement in Body Control System. Did you complete the replacement? | Go to Step 6 | -- |
6 |
Does the DTC reset? | Go to Step 2 | System OK |