Circuit Description
The body control module (BCM) controls the backup lamp relay. The BCM grounds the backup lamp relay control circuit which energizes the backup lamp relay.
Conditions for Running the DTC
Any of the following conditions may be present.
| • | The transaxle is not in the reverse position. |
| • | The emergency vehicle interior lamp switch is enabled. |
| • | The ignition switch is in the off position. |
Conditions for Setting the DTC
| • | The BCM detects a short to ground or open in the backup lamp relay control circuit when it is not trying to energize the backup lamp relay. |
| • | The condition above must be present for more than 0.3 seconds. |
Action Taken When the DTC Sets
The BCM stores DTC B2552 in memory.
Conditions for Clearing the DTC
| • | A current DTC B2552 will clear if the BCM no longer detects a short to ground or open in the backup lamp relay control circuit. |
| • | A history DTC B2552 will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present. |
Diagnostic Aids
| • | If the DTC B2552 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 ground or open in the backup lamp control circuit. |
| - | The backup lamp relay coil is intermittently shorted to ground or open internally. |
| - | The BCM is intermittently shorted to ground or open internally. |
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Fog Lights Schematics | |||
1 | Did you perform the Lighting System Diagnostic System Check? | Go to Step 2 | |
2 |
Does the backup lamp relay turn ON and OFF with each command? | Go to Diagnostic Aids | Go to Step 3 |
3 |
Does the test lamp illuminate? | Go to Step 4 | Go to Step 10 |
4 |
Does the test lamp turn ON and OFF with each command? | Go to Step 8 | Go to Step 5 |
5 | Does the test lamp remain illuminated with each command? | Go to Step 7 | Go to Step 6 |
6 | Test the backup lamp relay control circuit for a short to voltage or an open. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 13 | Go to Step 9 |
7 | Test the backup lamp relay control circuit for a short to ground. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 13 | Go to Step 9 |
8 | Inspect for poor connections at the backup lamp relay. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 13 | Go to Step 11 |
9 | Inspect for poor connections at the harness connector of the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 13 | Go to Step 12 |
10 | Replace the I/P accessory wiring junction block - right. Did you complete the repair? | Go to Step 13 | -- |
11 | Replace the backup lamp relay. Refer to Relay Replacement in Wiring Systems. Did you complete the replacement? | Go to Step 13 | -- |
12 |
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 13 | -- |
13 |
Does the DTC reset? | Go to Step 2 | System OK |
