Circuit Description
The body control module (BCM) controls the courtesy lamps through the courtesy lamp low control circuit. The BCM grounds the courtesy lamp low control circuit which completes the courtesy lamp low control circuit, and the lamps illuminate.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B2655 Courtesy Lamp Low Control Circuit High
Conditions for Running the DTC
The BCM must command the courtesy dimming feature ON.
Conditions for Setting the DTC
| • | The BCM detects a short to battery in the courtesy lamp low control circuit. |
| • | The condition above must be present for more than 0.3 seconds. |
Action Taken When the DTC Sets
The BCM stores DTC B2655 in memory.
Conditions for Clearing the DTC
| • | A current DTC B2655 clears if the short to battery positive voltage in the courtesy lamp low control circuit is no longer detected by the BCM. |
| • | A history DTC B2655 clears after 100 consecutive error free ignition cycles with no malfunction. |
Diagnostic Aids
| • | If the DTC B2655 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 battery positive voltage in the courtesy lamp low control circuit |
| - | Any courtesy lamp is intermittently shorted to battery positive voltage internally. |
| - | The BCM is intermittently shorted to battery positive voltage internally. |
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Interior Lights Dimming 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 lamps turn to full bright then dim to OFF? | Go to Diagnostic Aids | Go to Step 3 |
3 |
Does the test lamp illuminate? | Go to Step 4 | Go to Step 10 |
4 |
Does the test lamp turn ON then turn OFF? | Go to Step 8 | Go to Step 5 |
5 | Does the test lamp remain illuminated with each command? | Go to Step 7 | Go to Step 6 |
6 | Test the courtesy lamp low control circuit for a short to battery positive voltage or an open. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 13 | Go to Step 9 |
7 | Test the courtesy lamp low control circuit for a short to ground. Refer to Circuit Testing and to 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 of the interior lamps. Refer to Testing for Intermittent Conditions and Poor Connections and to 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 to Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 13 | Go to Step 12 |
10 | Repair the high resistance or the open in the courtesy lamp supply voltage circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 13 | -- |
11 | Replace the inoperative interior lamp. Refer to Instrument Panel Courtesy Lamp Bulb Replacement . Did you complete the replacement? | Go to Step 13 | -- |
12 | Replace the body control module. Refer to Control Module References in Computer/Integrating Systems for replacement, setup and programming. Did you complete the replacement? | Go to Step 13 | -- |
13 |
Does the DTC reset? | Go to Step 2 | System OK |
