B2602

DTC B2602 DRL Relay Output Short To Ground/Open:

CIRCUIT DESCRIPTION
This trouble code (both current and history) indicates that the Daytime Running Lamps (DRL) relay output is shorted to ground or open.

CONDITIONS FOR SETTING THE DTC
All of the following conditions must be met:
^ Ignition 3 is active.
^ The DRL relay is commanded OFF by the body control module (BCM).
^ The DRL feedback is present for 5 seconds.

ACTION TAKEN WHEN THE DTC SETS
^ Stores DTC B2602 in the BCM memory.
^ The SERVICE VEHICLE SOON indicator illuminates.
^ The check gauges chime sounds.

CONDITIONS FOR CLEARING THE DTC
^ The BCM goes to sleep and reinitializes with the fault cleared.
^ All of the BCM history codes clear after 100 ignition cycles (from OFF to ON) with no current codes active during the 100 ignition cycles.
^ Use the Scan Tool scan tool.

DIAGNOSTIC AIDS
^ With the ignition switch in the RUN position and the PARK/NEUTRAL position switch not in the PARK position, look for an open circuit between the BCM and the underhood wiring hamess junction block.
^ 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.
5. This step determines a bad connection at the Body Control Module (BCM).
7. This stop determines an open in CKT 592 between the Body Control Module (BCM) and the underhood wiring harness junction block.