Circuit Description
The body control module (BCM) controls the ground for the courtesy lamps through the courtesy lamp low control circuit. The BCM applies voltage to the courtesy lamps through the courtesy lamps supply voltage circuit. Ground for the courtesy lamps is applied from G201 to the BCM.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B2617 Passenger Compartment Dimming 2 Circuit Low
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 courtesy lamp low 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 courtesy lamp low 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. |
| • | The BCM receives a clear code command from the scan tool. |
Diagnostic Aids
| • | If the DTC B2617 is a history DTC, the fault maybe 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 courtesy lamp low control circuit |
| - | An intermittent open in the courtesy lamp supply voltage circuit |
| - | The BCM is intermittently shorted to ground or open |
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 courtesy lamps turn ON and OFF with each command? | Go to Diagnostic Aids | Go to Step 3 |
3 | Are the courtesy lamps ON at all times? | Go to Step 6 | Go to Step 4 |
4 |
Does the test lamp illuminate? | Go to Step 7 | Go to Step 5 |
5 | Test the courtesy lamps supply voltage circuit of the body control module (BCM) for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 8 |
6 | Test the courtesy lamp low control circuit of the BCM 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 10 | Go to Step 8 |
7 | Test the courtesy lamp low control circuit of the BCM for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 8 |
8 | 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 10 | Go to Step 9 |
9 | 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 10 | -- |
10 |
Does the DTC reset? | Go to Step 2 | System OK |
