For 1990-2009 cars
Master Electrical Component List
Wiper Motors

### Circuit Description

When operation of the rear wiper is selected, battery voltage from the rear wiper switch is applied to the rear wiper input of the body control module (BCM) circuit 94. The BCM responds by switching circuit 1445 to ground. This action energizes the rear wiper relay, providing power to the rear wiper motor.

### Conditions for Running the DTC

Ignition is in RUN or ACC position.

### Conditions for Setting the DTC

• | Rear wiper relay control circuit, circuit 1445, is shorted to battery.

• | Rear wiper relay control 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 short to battery voltage condition exists in circuit 1445 and the BCM has been requested to activate the rear wiper relay, the BCM will attempt to switch circuit 1445 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 Wiper/Washer Diagnostic System Check? | Go to Step 2 | Go to Diagnostic System Check - Wiper/Washer
2 |

1. Turn ON the ignition, with the engine OFF.
2. With a scan tool, command the rear wiper relay ON and OFF under body control module special functions.

Does relay follow command?

Go to Diagnostic Aids

Go to Step 3

3 |

1. Turn OFF the ignition.
2. Remove the rear wiper relay from the underhood fuse block (UHFB).
3. Connect the test lamp between rear wiper relay control circuit and the rear wiper relay battery voltage circuit.
4. 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 |

1. Turn OFF the ignition.
2. Disconnect the BCM connector C3.
3. Check for battery voltage on the rear wiper relay control circuit.

Does the voltage exist?

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 | Important: Perform the programming or setup procedure for the replaced control module if required. Replace the BCM. Refer to Body Control Module Replacement in Body Control System for applicable replacement procedure. Did you complete the replacement? | Go to Step 8 | --
8 |

1. Use the scan tool to clear the DTCs.
2. 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