Circuit Description
The body control module (BCM) receives an active ground from the courtesy lamp ground circuit . This input provides a ground path for all courtesy lamps through the interior lamp control circuit.
Conditions for Running the DTC
If the input does not match a normal ground potential.
Conditions for Setting the DTC
| • | The BCM detects a open when a ground is expected. |
| • | The condition above must be present for more than 0.3 seconds. |
Action Taken When the DTC Sets
The BCM stores DTC B2559 in memory.
Conditions for Clearing the DTC
| • | A current DTC B2559 will clear if the open is no longer detected by the BCM |
| • | A history DTC B2559 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 B2559 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 open in the courtesy lamps ground circuit. |
| - | The BCM is intermittently opened. |
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 System Diagnostic System Check? | Go to Step 2 | |
2 |
Do the interior lamps turn on? | Go to Diagnostic Aids | Go to Step 3 |
Test for an open or high resistance in the courtesy lamps ground circuit of the BCM. 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 set up 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 |
