B3922
DTC B3922
CIRCUIT DESCRIPTION
The body control module (BCM) monitors the windshield wiper switch low signal circuit. When the wiper switch is place in the low position, battery voltage is applied through the switch contacts, a series of resistors, and the wiper switch low signal circuit to the BCM. The BCM then applies battery positive voltage to the wiper relay control circuit which energizes the wiper relay. This allows battery voltage from the WIPER/WS fuse through the switch side of the relay to the windshield wiper motor.
DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC B3922 Front Wiper Function Select Circuit
CONDITIONS FOR RUNNING THE DTC
- The ignition is ON.
- The ignition voltage is between 9-16 volts.
CONDITIONS FOR SETTING THE DTC
The BCM detects a short to ground or a short to battery voltage on the windshield wiper switch low signal circuit.
ACTION TAKEN WHEN THE DTC SETS
- The BCM will not activate the low speed output.
- The windshield wipers will only operate in the high speed mode.
CONDITIONS FOR CLEARING THE DTC
- The DTC will clear on current status after the condition for setting the fault is corrected.
- A history DTC will clear after 50 consecutive ignition cycles without a fault present.
DIAGNOSTIC AIDS
Perform a visual inspection for loose or poor connections at all related components. Refer to Testing for Intermittent Conditions and Poor Connections. Component Tests and General Diagnostics
TEST
