B2603

DTC B2603 DRL Relay Output Short To Batter:

CIRCUIT DESCRIPTION
This is a trouble code (both current and history) that indicates the DRL relay control output is shorted to battery.

CONDITIONS FOR SETTING THE DTC
All of the following conditions must be met:
^ The ignition switch is in the RUN position.
^ The transaxle range switch is not in the PARK position.
^ The DRL option is configured.
^ The DRL relay output is active.
^ The DRL feedback is not present for 5 seconds.

ACTION TAKEN WHEN THE DTC SETS
^ Turns OFF the DRL relay
^ Enters a fault state
^ Stores DTC B2603 in the BCM memory
^ The SERVICE VEHICLE SOON indicator will illuminate.

CONDITIONS FOR CLEARING THE DTC
^ The fault state is exited upon the program return to the DRL OFF state.
^ All the BCM history codes will be cleared after 100 ignition cycles (from OFF to RUN) with no current codes active during the 100 ignition cycles.
^ Use the scan tool.

DIAGNOSTIC AIDS
If the DTC is a history DTC, the problem may be intermittent. Perform the above tests while wiggling the wiring and connectors. This may often cause the malfunction to appear.

TEST DESCRIPTION
The numbers below refer to the numbers on the diagnostic table.
2. This step determines if the DRL relay is operating properly.
3. This step determines if there is a short to the battery in CKT 592 within the underhood wiring harness junction block.
5. This step determines if there is a short to the battery in CKT 592 between the underhood wiring harness junction block and the body control module (BCM).