B2585

Park Lamps Control:

DTC B2585 Parklamp Control Circuit Malfunction (Part 1 Of 2):

DTC B2585 Parklamp Control Circuit Malfunction (Part 2 Of 2):

CIRCUIT DESCRIPTION
The Body Control Module (BCM) monitors the voltage on CKT 2409 in order to determine the actual state of the park lamp relay. The BCM also uses CKT 1080 in order to energize the park lamp relay.

CONDITIONS FOR SETTING THE DTC
To set B2585, the following conditions must be present:
^ The key is in the RUN position.
^ The park brake is released.
^ The headlamp and panel dimmer switch in the AUTO mode.
^ The ambient light sensor is in the DARK state.
^ There is a short to ground in CKT 2409 or open CKT 1080.
^ If CKT 2409 is open regardless of the headlamp and panel dimmer switch position the DTC will set.
^ If CKT 1080 is open with the headlamp and panel dimmer switch in the AUTO mode the DTC will set.
^ The system voltage must be between 9.0-16.0 volts.
^ The above conditions must be met for 0.5 seconds.

ACTION TAKEN WHEN THE DTC SETS
The parklamps will be inoperative in the AUTO mode.

CONDITIONS FOR CLEARING THE MIL/DTC
^ A current DTC will clear immediately when the condition for setting the fault is corrected with the key ON.
^ A history DTC will clear after 100 consecutive ignition cycles without a fault present.
^ Use a scan tool in order to clear the history and current DTCs.

DIAGNOSTIC AIDS

IMPORTANT: Use the appropriate probe from the for any probing of the Bussed Electrical Centers (BECs) in this table in order to avoid damage to the (BECs).

^ Always diagnose the first DTC listed on the scan tool.
^ The scan tool must display DTC B2585 as a current code before performing this set of diagnostics.
^ Perform a visual inspection for loose or poor connections at all related components. Refer to Intermittents and Poor Connections in Diagrams.

TEST DESCRIPTION
Step number(s) below refer to the same step number(s) in the Diagnostic Table.
2. This step determines if the PARK LPS fuse is open.
5. This step checks if CKT 74 (LT BLU) between the park lamp relay and the NT PARK fuse is open.
10. This step inspects if CKT 2409 (BRN) between the BCM and the NT PARK fuse is shorted to ground
12. This step inspects it CKT 1080 (WHT) between the BCM and the park lamp relay is open.
13. This step inspects the park lamp relay coil.
14. This step inspects if CKT 2409 (BRN) between the BCM and the NT PARK fuse is open.