DTC B3723. Saturn VUE

For 1990-2009 cars only

Makes 🢒 Saturn 🢒 2005 🢒 VUE - AWD 🢒 Vehicle Control Systems 🢒 Vehicle DTC Information 🢒 DTC B3723

Master Electrical Component List
Rear Wiper

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 B3723 Rear Wiper Relay Drive Circuit High

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 battery.

•	Rear wiper relay output is ON.

Actions Taken When the DTC Sets

•	Service (wrench) light will illuminate.

•	The rear wipers are inoperative.

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

•

When a shorted to battery voltage condition exists in the rear wiper relay control circuit and the BCM has been requested to activate the rear wiper relay, the BCM will attempt to switch circuit to ground. High current flow will result and the BCM output will go into a protective state. The BCM output will not allow itself to be activated for as much as 3 minutes.

•	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.

•	Inspect wiring harness for damage. Check for broken or chaffed insulation.

•	Review all fail information as this may assist in determining the conditions when the fault occurs.

•	If fault is suspected to be intermittent, wiggling harness wiring may help in locating fault.

Step	Action	Yes	No
Schematic Reference: Wiper/Washer Schematics Connector End View Reference: Master Electrical Component List in Wiring Systems
1	Did you perform the Diagnostic System Check - Vehicle?	Go to Step 2	Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2	Turn ON the ignition, with the engine OFF. With a scan tool, command the rear wiper relay ON and OFF under body control module (BCM) special functions. Does relay follow command?	Go to Diagnostic Aids	Go to Step 3
3	Turn OFF the ignition. Remove the rear wiper relay in underhood fuse block (UHFB). Connect the test lamp between rear wiper relay control circuit and the rear wiper motor switch at the rear wiper relay. Using a scan tool, command rear wiper relay ON and OFF. Does the test lamp follow command?	Go to Step 6	Go to Step 4
4	Turn OFF the ignition. Disconnect the BCM connector C3. Check for battery voltage on the rear wiper relay control circuit. Does the voltage exist on the rear wiper relay control circuit?	Go to Step 5	Go to Step 7
5	Repair short to battery in the rear wiper relay control circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair?	Go to Step 8	--
6	Replace the rear wiper relay. Refer to Relay Replacement in Wiring Systems. Did you complete the replacement?	Go to Step 8	--
7	Replace the BCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement?	Go to Step 8	--
8	Use the scan tool to clear the DTCs. Operate the vehicle within the conditions for running the DTC as specified in the supporting text. Does the DTC reset?	Go to Step 2	System OK