B0285
B0285 - Electric Rear Defog Circuit LowB0285 - Electric Rear Defog Circuit Low:
CIRCUIT DESCRIPTION
When rear defog request is active, the BCM will respond by grounding circuit 193, the coil side of the rear defog relay. This action energizes the rear defog relay.
The first time in an ignition cycle that the rear defog is activated, rear defog will remain On for 15 minutes or until the ignition switch is turned Off. If rear defog is activated again during the same ignition cycle, rear defog will remain On for 7 1/2 minutes or until the ignition switch is turned Off.
DTC PARAMETERS
^ Ignition in RUN
^ Circuit 193 grounded or open
^ BCM is NOT requesting the rear defog system
^ Condition exists for 30 seconds (output Off)
^ No light will illuminate in I/P
^ Ignition maxifuse is open
DIAGNOSTIC AIDS :
^ Check 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).
^ Inspect wiring harness for damage. Check for broken or chaffed insulation.
^ If fault is suspected to be intermittent, wiggling harness wiring may help in locating fault.
^ The LED on the defogger button does not illuminate when pressed.
TEST
Diagnostic Chart:
