B2600

DTC B2600

CIRCUIT DESCRIPTION
The body control module (BCM) signals the turn/hazard flasher module to illuminate the daytime running lamps (DRL) by grounding the DRL low control circuit. The DRL operates when the ignition switch is in the RUN position and the gear selector is not in the park position.

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

CONDITIONS FOR SETTING THE DTC
- When the BCM sends a DRL OFF command and the DRL low control circuit is shorted to ground.
- When the BCM sends a DRL ON command and the DRL low control circuit is shorted to voltage or open.
- When the Flasher fuse 15 in the underhood fuse block is open.
- When the following circuits are shorted to ground:
- Left rear stop/turn lamp supply voltage
- Right rear stop/turn lamp supply voltage
- Left DRL/turn supply voltage
- Right DRL/turn supply voltage
- Left turn signal indicator lamp supply voltage
- Right turn signal indicator lamp supply voltage
- Battery supply voltage from the underhood fuse block Flasher fuse
- The instrument panel lamps dimming control circuit is shorted to ground.

ACTION TAKEN WHEN THE DTC SETS
The DRL will not operate or will remain 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 Flasher fuse to open.
- Left rear stop/turn lamp supply voltage
- Right rear stop/turn lamp supply voltage
- Left DRL/turn supply voltage
- Right DRL/turn supply voltage
- Left turn signal indicator lamp supply voltage
- Right turn signal indicator lamp supply voltage
- Battery supply voltage from the underhood fuse block Flasher fuse
- An open in the Flasher fuse will cause the DRL, turn signals and the hazard flashers to be inoperative.

TEST DESCRIPTION

Steps 1-5:

Steps 6-11:

Steps 12-13:

The numbers below refer to the step numbers on the diagnostic table.
2. This step test determines if the problem exists in the DRL control/BCM or other circuitry.
3. This step test determines if the problem exists in the wiring or the BCM.
7. This step test determines if the problem exists in the wiring or the BCM.
9. After replacement of the BCM you must calibrate the new module for proper operation.