Circuit Description
When the body control module (BCM) receives a class 2 signal from the power control module (PCM) indicating the gear selector is in the REVERSE position, the BCM applies battery positive voltage to the backup lamps voltage supply circuit. The backup lamps are grounded at G301 for the left backup lamp and G302 for the right backup lamp.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B2545 Backup Lamps Circuit
Conditions for Running the DTC
The battery voltage must be between 9-16 volts.
Conditions for Setting the DTC
DTC B2545 is set either when the backup lamps supply voltage circuit is shorted to ground or opened, or if the CHMSL/Bkup fused voltage supply circuit to the BCM is shorted to ground or opened.
Action Taken When the DTC Sets
The backup lamps will not operate.
Conditions for Clearing the DTC
| • | This DTC will clear on current status after the condition for setting the fault is corrected. |
| • | A history DTC will clear after 100 consecutive ignition cycles without a fault present. |
| • | History DTCs can be cleared using a scan tool. |
Diagnostic Aids
Perform a visual inspection for loose or poor connections at all related components. Refer to Testing for Intermittent Conditions and Poor Connections .
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Exterior Lights Schematics Connector End View Reference: Master Electrical Component List | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | |
2 |
Do the backup lamps turn ON and OFF with each command? | Go to Diagnostic Aids | Go to Step 3 |
3 | Test the backup lamps voltage supply circuit for a short to ground or an open. Refer to Circuit Testing and to Wiring Repairs . Did you find and correct the condition? | Go to Step 6 | Go to Step 4 |
4 | Test the CHMSL/Bkup fused voltage supply circuit to the BCM for a short ground or an open. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 6 | Go to Step 5 |
5 | Replace the body control module (BCM) . Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 6 | -- |
6 |
Does the DTC reset? | Go to Step 2 | System OK |
