Diagnostic Routine F

Diagnostic Routine F

Diagnostic Overview

The Windshield Wipers Operate in High Speed Only

Refer to Wiring Diagram Set 81 for schematic and connector information Electrical Diagrams.

Normal Operation and Fault Conditions

REFER to Windshield Wiper Operation . An internal failure of the SASM (Steering Angle Sensor Module) or a circuit concern that causes a failure in the LIN (Local Interconnect Network) causes the windshield wipers to operate in high speed only.

Both the SASM (Steering Angle Sensor Module) and the headlamp switch communicate with the BCM (Body Control Module) over the same BCM (Body Control Module) internal LIN (Local Interconnect Network) bus, but they each have their own LIN (Local Interconnect Network) circuit. A short to ground or a short to voltage on either of the LIN (Local Interconnect Network) circuits will affect both the low beam headlamps (default to always on) and the windshield wipers (default to HIGH speed operation only). An open circuit on either LIN (Local Interconnect Network) circuit will only affect the individual system.

DTC Fault Trigger Conditions






Pinpoint Test

1. CHECK HEADLAMP LOW BEAM OPERATION

1. Place the headlamp switch in the OFF position.

2. Place the wiper/washer switch in the OFF position.

3. Ignition ON.

4. Cycle the windshield wiper switch from OFF to INTERMITTENT, LOW and HIGH.

Are the headlamp low beams illuminated with the switch OFF and do the windshield wipers operate in HIGH speed only?







2. CHECK THE LIN (Local Interconnect Network) CIRCUIT FOR AN OPEN

1. Ignition OFF.

2. Disconnect SASM (Steering Angle Sensor Module) C226A.

3. Disconnect BCM (Body Control Module) C2280C.

4. Measure:





Is the resistance less than 3 ohms?







3. CHECK FOR CORRECT SASM (Steering Angle Sensor Module) OPERATION

1. Ignition OFF.

2. Disconnect and inspect all SASM (Steering Angle Sensor Module) electrical connectors.

3. Repair:

- corrosion (install new connector or terminal - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary

4. Connect all SASM (Steering Angle Sensor Module) electrical connectors. Make sure they seat and latch correctly.

5. Connect BCM (Body Control Module) C2280C.

6. Operate the system and determine if the concern is still present.

Is the concern still present?