Circuit Description
The Body Control Module (BCM) controls the courtesy lamps through the theater dimming control circuit. The BCM grounds theater dimming control circuit which completes the footwell lamps ground circuit, and the lights illuminate.
Conditions for Running the DTC
The BCM must be commanding the theater dimming feature OFF.
Conditions for Setting the DTC
| • | The BCM detects that the output for the theater dimming control circuit is low when it is expected to be high. |
| • | The condition above must be present for more than 0.3 seconds. |
Action Taken When the DTC Sets
The BCM stores DTC B2617 in memory.
Conditions for Clearing the DTC
| • | A current DTC 2617 will clear if the short to ground or open in the theater dimming control circuit is no longer detected by the BCM. |
| • | A history DTC B2617 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. |
Diagnostic Aids
| • | If the DTC B2617 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 short to ground or open in the theater dimming control circuit |
| - | Any courtesy lamp is intermittently shorted to ground or open internally |
| - | The BCM is intermittently shorted to ground or open internally |
Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
-
Watch for the courtesy lamps to illuminate. Command both the ON and OFF states. Repeat the commands as necessary.
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Tests for voltage at the courtesy lamps.
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Verifies that the Body Control Module is providing ground to the courtesy lamps.
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Tests if ground is constantly being applied to the courtesy lamps.
Step | Action | Yes | No |
|---|---|---|---|
1 | Did you perform the Lighting System Diagnostic System Check? | Go to Step 2 | |
Do the courtesy lamps turn ON and OFF with each command? | Go to Diagnostic Aids | Go to Step 3 | |
Does the test lamp illuminate at each courtesy lamp? | Go to Step 4 | Go to Step 10 | |
Does the test lamp turn ON and OFF with each command? | Go to Step 8 | Go to Step 5 | |
Does the test lamp remain illuminated with each command? | Go to Step 7 | Go to Step 6 | |
6 | Test the control circuit of the courtesy lamps for high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 13 | Go to Step 9 |
7 | Test the control circuit of the courtesy lamps for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 13 | Go to Step 9 |
8 | Inspect for poor connections at each courtesy lamp. 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 13 | Go to Step 11 |
9 | 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 13 | Go to Step 12 |
10 | Repair the feed circuit of the courtesy lamps. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 13 | -- |
11 | Replace the inoperative courtesy lamp. Did you complete the replacement? | Go to Step 13 | -- |
12 | Replace the Body Control Module. Refer to Body Control Module Replacement in Body Control Systems. Did you complete the replacement? | Go to Step 13 | -- |
13 |
Does the DTC reset? | Go to Step 2 | System OK |
