Failed rear wiper motor assembly; Damaged or corroded wiring harness or connector at the rear hatch; Blown fuse or faulty relay in the rear wiper circuit; Faulty rear wiper switch or stalk; Water intrusion into the rear wiper motor or connector; Body control module (BCM) internal fault

DTC codes / B09xx · Airbags, seats, doors, lights and comfort systems / B0910

B0910Wiper Motor Rear Circuit

Q: What does code B0910 mean?

Wiper Motor Rear Circuit. B0910 indicates that the body control module (BCM) has detected an abnormal condition in the rear wiper motor circuit, such as an open, short, or excessive current draw. The BCM monitors the circuit and sets this code when the rear wiper fails to operate as commanded or the feedback signal is outside the expected range.

B0910 indicates that the body control module (BCM) has detected an abnormal condition in the rear wiper motor circuit, such as an open, short, or excessive current draw. The BCM monitors the circuit and sets this code when the rear wiper fails to operate as commanded or the feedback signal is outside the expected range.

SystemBody

Code typeGeneric (all makes)

SeverityLow

Fix difficultyIntermediate

AreaAirbags, seats, doors, lights and comfort systems

Symptoms you may notice

Rear wiper does not operate at all when switched on
Rear wiper runs continuously or at the wrong speed
Rear wiper parks in the wrong position or fails to return to rest
Blown fuse for the rear wiper circuit
Often no symptoms besides the warning light if the fault is intermittent

Common causes, most likely first

Failed rear wiper motor assembly
Damaged or corroded wiring harness or connector at the rear hatch
Blown fuse or faulty relay in the rear wiper circuit
Faulty rear wiper switch or stalk
Water intrusion into the rear wiper motor or connector
Body control module (BCM) internal fault

How to diagnose and fix it

Check the rear wiper fuse and replace if blown
Inspect the wiring and connector at the rear wiper motor for corrosion or damage
Test the rear wiper motor directly with power and ground to verify operation
Check the rear wiper switch signal to the BCM using a scan tool
Measure resistance and voltage on the rear wiper motor circuit to identify opens or shorts
If all circuits test good, replace the rear wiper motor
Clear the code and verify the repair with a test drive and wiper operation

Rear wiper circuit faults often misdiagnosed

A common mistake is replacing the rear wiper motor without checking the wiring harness that flexes at the hatch hinge, where broken wires are frequent.
Water can enter the rear wiper motor connector and cause intermittent faults that do not appear during a simple bench test.
The BCM may set B0910 even when the wiper motor works, if the park switch signal is missing or erratic.
Aftermarket rear wiper motors sometimes have incompatible park switch logic, causing the code to return immediately after replacement.

Can I keep driving with B0910?

The rear wiper is not a safety-critical system for most driving conditions, but reduced rear visibility in rain or snow can be hazardous. Avoid driving in inclement weather until the fault is repaired, and address the issue promptly to prevent further electrical damage.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.