With RPO Code YF7

DTC B2615 (WITH RPO CODE YF7)

CIRCUIT DESCRIPTION
The body control module (BCM) receives a ground signal from the door jamb or courtesy lamp switches requesting courtesy/dome lamp illumination. When this occurs, the BCM sends a voltage through the courtesy lamp high control circuit to the courtesy lamp relay, illuminating the courtesy/dome lamps.

Voltage for the courtesy lamp high control circuit as well as the backup lamp supply voltage circuit is from the body fuse block TBC 2 fuse directly through the BCM to these circuits.

CONDITIONS FOR RUNNING THE DTC
The battery voltage must be between 9.0-16.0 volts.

CONDITIONS FOR SETTING THE DTC
- When the BCM receives a courtesy lamp illumination request signal and the courtesy lamp high control circuit is shorted to ground.
- When the BCM is not receiving a courtesy lamp illumination request signal and the courtesy lamp high control circuit is open or shorted to voltage.
- When the courtesy lamp relay coil side is open.
- There is a loss of the body fuse block TBC 2 battery supply voltage to the BCM for 1 second.

ACTION TAKEN WHEN THE DTC SETS
The courtesy dome lamps will not operate or are always ON.

CONDITIONS FOR CLEARING THE MIL/DTC
- This DTC will clear on current status after the condition for setting the fault is corrected.
- A history DTC will clear after 100 consecutive ignition cycles without a fault present.
- History and current DTCs can be cleared using a scan tool.

DIAGNOSTIC AIDS
- Perform a visual inspection for loose or poor connections at all related components.
- A short to ground in the following circuits will cause the TBC 2 fuse to open.
- Courtesy lamp high control.
- Backup lamp supply voltage.
- Battery positive voltage from the body fuse block TBC 2 fuse.

TEST DESCRIPTION

Steps 1-4:

Steps 5-9:

The numbers below refer to the step numbers on the diagnostic table.
5. This step tests for an open coil in the courtesy lamp relay.
8. After replacement of the BCM you must calibrate the new module for proper operation.