B1422: Rear Right Window Motor Circuit
The B1422 code indicates a fault in the rear right window motor circuit, commonly found in Toyota and Lexus vehicles. The body control module detects an abnormal condition such as a short circuit, open circuit, or excessive resistance in the motor winding. This triggers a diagnostic trouble code (DTC) when current or voltage readings fall outside normal operating parameters.
1. Commonly Affected Makes
2. Most Common Causes
- Faulty rear right window motor with damaged windings
- Short to ground or battery voltage in the wiring
- Corroded or damaged connector pins at the motor or switch
- Open circuit in the harness between the switch and motor
- Defective master window switch
- Internal failure of the body control module (Body ECU)
3. Symptoms You Will Notice
- Rear right window does not move or operates intermittently
- Window moves slowly or erratically
- Window may only work from one switch (master or local)
4. Step-by-Step Diagnosis
Check for other related DTCs and verify the code with a scan tool
Inspect the rear right window motor connector for corrosion, damage, or loose pins
Test the motor by applying direct battery power and ground to see if it operates
Measure resistance across the motor terminals; compare to specifications (typically 2-5 ohms)
Check for voltage and ground at the motor connector with the switch activated
Inspect the wiring harness for shorts, opens, or chafing between the switch and motor
Test the master window switch for proper continuity and function
If all else is normal, suspect a faulty body control module
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, it is generally safe to drive, but the rear right window may not operate. This is a medium-severity issue that does not affect vehicle safety or drivability.
How much does it cost to fix?▼
Repair costs typically range from $150 to $400, depending on the cause. A window motor replacement is around $200-$300, while wiring repairs or module replacement can be higher.