B2550

DTC B2550

CIRCUIT DESCRIPTION
When the Body Control Module (BCM) receives a class 2 message from the Powertrain Control Module (PCM) requesting to illuminate the backup lamps, battery voltage is sent directly from the BCM through the backup lamp supply voltage circuit to the backup lamps.

DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:

DTC B2550 Backup Lamps Control Circuit

CONDITIONS FOR RUNNING THE DTC
The battery voltage must be between 9-16 volts.

CONDITIONS FOR SETTING THE DTC
- When the BCM receives a backup lamp request signal and the backup lamp supply voltage circuit is shorted to ground.
- When the BCM is not receiving a backup lamp request signal and the backup lamp supply voltage circuit is open or shorted to voltage.

ACTION TAKEN WHEN THE DTC SETS
The backup lamps will not operate.

CONDITIONS FOR CLEARING THE MIL/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 and current 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. Testing for Intermittent Conditions and Poor Connections

TEST DESCRIPTION




The numbers below refer to the step numbers on the diagnostic table.
2. This step determines if the problem exists in the wiring or the BCM.
3. Inspects for poor connections before a component is replaced.
4. After replacement of the BCM you must calibrate the new module for proper operation.