Circuit Description
The body control module (BCM) controls the courtesy lamps through the courtesy lamps supply voltage circuit. The BCM grounds the courtesy lamp low control circuit which completes the courtesy lamps circuit.
Conditions for Running the DTC
The BCM must be commanding the courtesy lamp feature off.
Conditions for Setting the DTC
| • | The BCM detects that the output for the courtesy lamps supply voltage is low when it is expected to be high. |
| • | The condition above must be present for more than 0.1 seconds |
Action Taken When the DTC Sets
The BCM stores DTC B1482 in memory.
Conditions for Clearing the MIL/DTC
| • | A current DTC B1482 will clear if the short to ground is no longer detected by the BCM. |
| • | A history DTC B1482 will clear after 100 consecutive ignition cycles if the condition for the condition is no longer present nor any other condition in the BCM is detected. |
| • | The BCM receives a clear code command from the scan tool. |
Diagnostic Aids
| • | If the DTC B1482 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 condition to occur: |
| - | An intermittent short to ground in the courtesy lamps supply voltage circuit. |
| - | The BCM is intermittently shorted to ground. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Interior Lights Schematics | |||
1 | Did you perform the Lighting Diagnostic System Check? | Go to Step 2 | |
2 |
Does the scan tool display on? | Go to Diagnostic Aids | Go to Step 3 |
Test for a short to ground in the courtesy lamp supply voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 6 | 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 6 | Go to Step 5 |
5 |
Important: Perform the setup procedure for the 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 set again? | Go to Step 2 | System OK |
