Refer to
Interior Lights Output
.
Circuit Description
The body control module (BCM) receives an active ground. The sole purpose of this input is to provide a ground for all courtesy lamp current flowing through the theater dim output.
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 then 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 or any other malfunction in the BCM is detected. |
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. |
Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Lighting Systems Diagnostic System Check? | -- | Go to Step 2 | |
2 |
Do the IP lamps turn to full bright then dim to OFF? | -- | Go to Diagnostic Aids | Go to Step 3 |
Test the theater dimming ground signal circuit of the BCM for a open. 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 body control module. 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 body control module. Replace the body control module. Refer to Body Control Module Replacement . Did you complete the repair? | -- | Go to Step 6 | -- |
6 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
