B3722
DTC B3722
CIRCUIT DESCRIPTION
When operation of the rear wiper is selected, battery voltage from the rear wiper switch is applied to the rear wiper switch signal input of the body control module (BCM) circuit. The BCM responds by switching the rear wiper relay control circuit to ground. This action energizes the rear wiper relay, providing power to the rear wiper motor.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B3722 Rear Wiper Relay Drive Circuit Low
CONDITIONS FOR RUNNING THE DTC
Ignition is in RUN or ACC position.
CONDITIONS FOR SETTING THE DTC
- The rear wiper relay control circuit is shorted to ground or open.
- Rear wiper relay output if OFF.
ACTIONS TAKEN WHEN THE DTC SETS
Service (wrench) light will illuminate.
CONDITIONS FOR CLEARING THE DTC
- A current DTC clears when the fault is no longer present.
- A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat of the fault.
DIAGNOSTIC AIDS
- Check for poor connection at the BCM. Inspect harness connectors for backed out terminals, improper terminal mating, broken connectors locks, improperly formed or damaged terminals and poor terminal-to-wire connection, terminal crimped over wire insulation and not conductors.
- If the rear wiper relay control circuit is open, the rear wipers will be inoperative.
- If the rear wiper relay control circuit is shorted to ground, the rear wipers will always be ON.
- 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.
TEST
