B1425: RR Window Motor Circuit Short to Ground
Diagnostic trouble code B1425 indicates a short to ground in the right rear power window motor circuit. This Toyota-specific code is triggered when the body control module (Body ECU) detects abnormally low resistance in the power supply circuit to the rear passenger-side window motor, suggesting that current is bypassing the motor and flowing directly to ground. The system continuously monitors circuit integrity via current sensors or load detection to identify this anomaly.
1. Commonly Affected Makes
2. Most Common Causes
- Right rear window motor with internal winding shorted to housing
- Harness wiring between Body ECU and right rear motor damaged or chafing against chassis
- Right rear window motor connector with corroded or bent pins causing a short
- Right rear window control relay with welded contacts or internal failure
- Body ECU with damaged low-side drive transistor
- Moisture or water intrusion in right rear door affecting electrical components
3. Symptoms You Will Notice
- Right rear window inoperative or moves intermittently
- Window may operate in reverse direction or stop unexpectedly
- Blown fuse for power window circuit
- Body ECU may log additional related codes
4. Step-by-Step Diagnosis
Inspect right rear door for water damage or corrosion in connectors and wiring
Check for blown fuses and replace if necessary
Disconnect right rear window motor connector and measure resistance between motor power and ground; a short indicates faulty motor
Test wiring harness for continuity and shorts between Body ECU and motor connector
Check window control relay for stuck contacts or internal short
If all else passes, suspect Body ECU internal failure
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, the vehicle is generally safe to drive, but the right rear window will not operate properly. Avoid driving in conditions where window function is critical.
How much does it cost to fix?▼
Repair costs typically range from $150 to $500, depending on the root cause. A faulty motor or wiring repair is on the lower end, while Body ECU replacement can be higher.