Circuit Description
The body control module (BCM) receives an ground from the courtesy lamp ground circuit. The sole purpose of this input is to provide a ground path for all of the courtesy lamps controlled through the courtesy lamp low control circuit.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B2559 Passenger Compartment Lamp Control Circuit Open
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 malfunction is no longer present nor any other malfunction 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 malfunction to occur: |
| - | An intermittent open in the theater dimming ground circuit. |
| - | The BCM is intermittently opened. |
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Interior Lights Schematics Connector End View Reference: Master Electrical Component List in Wiring Systems | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 |
Do the interior lamps turn ON? | Go to Diagnostic Aids | Go to Step 3 |
3 |
Does the test lamp illuminate? | Go to Step 4 | Go to Step 5 |
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 7 | Go to Step 6 |
5 | Repair the open or high resistance in the courtesy lamps ground circuit of the BCM that provides a ground path for the courtesy lamps low control circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 7 | -- |
6 | Replace the BCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup and programming. Did you complete the replacement? | Go to Step 7 | -- |
7 |
Does the DTC reset? | Go to Step 2 | System OK |
