B2585

DTC B2585

CIRCUIT DESCRIPTION
The body control module (BCM) turns ON the park lamp relay when the ambient light sensor senses a dark condition. Battery positive voltage is supplied to the park lamp relay at all times through the PARK fuse. The BCM grounds the park lamp relay control circuit in order to activate the relay. With the park lamp relay activated voltage is supplied to the park lamp supply voltage circuit illuminating the park lamps, license lamps, marker lamps, and signaling the BCM.

DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC B2585 Park Lamp Circuit

CONDITIONS FOR RUNNING THE DTC
- The ignition switch is in the RUN position.
- The ambient light sensor senses a dark condition, automatic lamp control (ALC) park lamps ON, or the headlamp switch is in the park or head ON position.

CONDITIONS FOR SETTING THE DTC
Any of the following conditions will set this DTC:
- The park lamp relay control circuit is open.
- The park lamp supply voltage circuit is open between the instrument panel (I/P) fuse block and the BCM for 5 seconds.
- The park lamp supply voltage circuit is shorted to ground.
- The park lamp relay is stuck in the OPEN position.

ACTION TAKEN WHEN THE DTC SETS
- The park lamps will operate properly if the park lamp supply voltage circuit is open between the I/P fuse block and the BCM.
- The park lamps will not illuminate if relay is stuck open or the PARK fuse in the I/P fuse block is open.

CONDITIONS FOR CLEARING THE DTC
- The BCM receives the clear code command from the scan tool.
- A current DTC will clear when the conditions for setting the DTC are no longer present.
- A history DTC clears after 100 malfunction free ignition cycles.

DIAGNOSTIC AIDS
If the DTC is a history DTC, the problem may be intermittent.

TEST DESCRIPTION

Step 1 - Step 12:

The numbers below refer to the step numbers on the diagnostic table.
2. Listen for an audible click when the park lamp relay operates. Command both the ON and OFF states. Repeat the commands, as necessary.
3. Tests for voltage at the coil side of the park lamp relay. The PARK fuse supplies battery positive voltage to the coil side of the park lamp relay.
4. Verifies that the BCM is providing ground to the park lamp relay.