Circuit Description
The backup lamps circuit is completed by the BCM when it receives a signal from the PCM that the vehicle is in reverse. The BCM grounds circuit 38, energizing the back up lamp relay.
Conditions for Setting the DTC
The BCM detects a short to ground or an open in circuit 38.
Action Taken When the DTC Sets
The BCM stores DTC B2552 in memory.
Conditions for Clearing the DTC
| • | The BCM detects a short to ground in circuit 38. |
| • | A history DTC will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present. |
| • | Using a scan tool. |
Diagnostic Aids
| • | The following conditions may cause an intermittent malfunction to occur: |
| - | An intermittent open or short to ground in circuit 38. |
| - | Poor connections at the BCM, or the back up lamp relay terminals. |
| • | The back up lamp relay coil is open. |
| • | The BCM is open or shorted to ground internally. |
| • | An intermittent open in circuit 840. |
| • | If the DTC is a history DTC, the problem may be intermittent. Try performing the tests shown while moving wiring and connectors, this can often cause the malfunction to reappear. |
| • | DTC P1626 will set in the Powertrain Control Module (PCM) when the ignition switch is on with the Body Control module (BCM) disconnected. When BCM diagnostics and repairs are completed, refer to Engine Controls for additional information on PCM related DTCs. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
This step checks for voltage in circuit 38.
-
This step determines whether the malfunction is intermittent or the BCM is faulty.
-
This step checks for a short to ground in circuit 38.
-
This step determines whether the short to ground is in circuit 38 or the backup lamp relay is faulty.
-
This step checks for an open in circuit 38.
-
This step determines whether circuit 840 is open or the backup lamp relay is faulty.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the BCM Diagnostic System Check performed? | -- | ||
Is the test light on? | -- | |||
Does BCM DTC B2552 reset as a current DTC? | -- | |||
Using a test light, connect between B+ and the BCM harness connector C2 terminal A12. Is the test light on? | -- | |||
Is the test light on? | -- | |||
Using a test light, connect between the backup lamp relay harness connector terminal A1 and ground. Is the test light on? | -- | |||
7 | Replace the backup lamp relay. Is the repair complete? | -- | -- | |
Using a test light, connect between the backup lamp relay harness connector terminal C2 and ground. Is the test light on? | -- | |||
9 |
Is the repair complete? | -- | -- | |
10 | Repair short to ground in circuit 38 between the BCM connector C2 terminal A12 and the backup lamp relay connector terminal A1. Is the repair complete? | -- | -- | |
11 | Repair poor connection or open in circuit 38 between the BCM connector C2 terminal A12 and the door lock relay connector terminal A1. Is the repair complete? | -- | -- | |
12 | Repair poor connection or open in circuit 840. Is the repair complete? | -- |
| -- |
13 | The malfunction is not present at this time. Refer to Diagnostic Aids for additional information regarding DTC B2552. Is the repair complete? | -- | -- | |
14 |
Are there any BCM current DTCs set? | -- | System OK |
