Pinpoint Test A : All Windshield Wiper Modes Are Inoperative From One Or Both Windshield Wiper Motors: Notes
WARNING: This page is about a different car, the 2018 Ford Focus. However, it is still accessible from the selected car via links, so may be relevant.
Diagnostics in this article assume a certain skill level and knowledge of Ford-specific diagnostic practices. REFER to: Diagnostic Methods .
Refer to Wipers and Washers for schematic and connector information.
Normal Operation and Fault Conditions
REFER to: Wipers and Washers - System Operation and Component Description .
BCM DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B1131:87 | Wiper Motor Module: Missing Message | Sets when the BCM does not receive a reply from the driver side windshield wiper motor over the LIN. An internal failure of the driver side windshield wiper motor, a voltage supply or ground circuit can cause this concern. |
| B129A:86 | LIN Bus "D": Signal Invalid | Sets when the BCM receives invalid data from the driver side windshield wiper motor over the LIN. |
| B129A:88 | LIN Bus "D": Bus Off | Sets when the BCM receives no data from the driver side windshield wiper motor over the LIN. |
| B1D38:16 | Front Wiper Motor: Circuit Voltage Below Threshold | Sets when the BCM receives a low voltage message from the driver side windshield wiper motor. The driver side windshield wiper motor sends the message when the voltage supply to either wiper motor is below 9.5 volts |
| B1D38:17 | Front Wiper Motor: Circuit Voltage Above Threshold | Sets when the BCM receives a high voltage message from the driver side windshield wiper motor. The driver side windshield wiper motor sends the message when the voltage supply to either wiper motor is above 15 volts. |
| B1D38:19 | Front Wiper Motor: Circuit Current Above Threshold | Sets when the BCM receives a high current message from the driver side windshield wiper motor. The driver side windshield wiper motor sends the message when either wiper motor is experiencing an excessive current draw and is in danger of overheating. When set, the wiper motor speed is decreased to allow the motor to cool down. |
Possible Causes
- Fuse
- Wiring, terminals or connectors
- Wiper/washer switch
- Windshield wiper motor
- Battery monitoring sensor
- SASM
- BCM
Visual Inspection and Diagnostic Pre-checks
- Inspect the BJB fuse 18 (20A) and make sure it is OK.
- Inspect the wiper relay for damage.