The body control module (BCM) activates the parklamp relay when the light senses a dark condition. Battery voltage is supplied to the parklamp relay through the fuse circuit located in the LIPFB. The BCM provides ground to circuit 1080 to activate the parklamp relay for two conditions if the headlamp switch is moved to the parklamp position and if in the automatic lighting control (ALC) mode. If the parklamp relay control circuit 1080 is shorted to ground or open DTC B2587 will fail as current.

1. Parklamp relay is commanded OFF.
2. Parklamp switch is OFF.
3. Short to ground or open
4. Ignition in RUN
5. Condition is present for 5 seconds.
6. No light will illuminate in the instrument panel (I/P).

1. Inspect for poor connection at the BCM. Inspect harness connectors for backed-out terminals, improper terminal mating, broken connector locks, improperly formed or damaged terminals and poor terminal-to-wire connection (terminal crimped over wire insulation and not conductors).
2. Inspect wiring harness for damage. Inspect for broken or chaffed insulation.
3. If fault is suspected to be intermittent, wiggling the harness wiring may help in locating fault.