B2585

DTC B2585 Parklamp Control Circuit Malfunction:

CIRCUIT DESCRIPTION
This is a trouble code (both current and history) that indicates the parklamps were not ON when the Automatic Lighting Control (ALC) relay output was ON.

CONDITIONS FOR SETTING THE DTC
Meet all of the following conditions:
^ The ALC option is enabled and ignition us active.
^ The ALC parklamp relay output is active.
^ The parklamp input is not active for 5 seconds.

ACTION TAKEN WHEN THE DTC SETS
Stores the DTC B2585 in the Body Control Module (BCM) memory.
^ The SERVICE VEHICLE SOON indicator will illuminate.
^ The check gauges chime sounds.

CONDITIONS FOR CLEARING THE DTC
^ The Body Control Module (BCM) reads the proper parklamp voltage.
^ Conditions for the fault are no longer present.
^ All the BCM history codes will be cleared 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
^ If you find B+ on the BCM parklamp relay output, check the ALC parklamp relay and the power to the relay.
^ If the DTC is a history DTC, the problem may be intermittent. Try performing the above tests while wiggling the wiring and connectors. This can often cause the malfunction to appear.

TEST DESCRIPTION
The numbers below refer to the numbers on the diagnostic table.
4. This step determines if the Body Control Module (BCM) verifies proper operation of the ALC parklamps.
6. This step determines if an open exists in CKT 9 between the right IP wiring harness junction block and the BCM.
7. This step determines if an open exists in CKT 1970 between the underhood wiring harness junction block and the BCM.