What Does B1422 Mean?
This code indicates the Body Control Module (BCM) has detected a fault in the rear right (passenger side) power window motor circuit. The BCM monitors voltage, current draw, and circuit continuity when the window switch is activated, and has identified an abnormal condition such as an open circuit, short to ground, short to power, or excessive resistance. This prevents normal operation of the rear right power window.
Common Causes
40%
Failed or seized rear right window motor with high resistance or internal short
30%
Damaged wiring harness or corroded connector between BCM and window motor
20%
Faulty rear right window switch with internal circuit failure
10%
Body Control Module internal driver circuit failure
Diagnostic Steps
1
Step 1: Perform visual inspection of rear right window motor connector for corrosion, water intrusion, pushed-back pins, or damaged terminals. Disconnect connector and inspect both male and female sides.
2
Step 2: Using a digital multimeter, test for battery voltage (12-14V) at the motor connector with window switch activated in both UP and DOWN positions. Verify voltage polarity reverses between directions.
3
Step 3: Remove rear right window motor and bench test by applying 12V directly to motor terminals in both polarities. Motor should run smoothly in both directions drawing 3-8 amps. Measure resistance across motor terminals (should be 2-6 ohms typically).
4
Step 4: If motor tests good, check wiring harness continuity from motor connector back to BCM connector using multimeter in ohms mode. Test each wire individually and check for shorts to ground or power (should read infinite resistance).
5
Step 5: Test rear right window switch by measuring resistance through switch contacts in UP, DOWN, and neutral positions per manufacturer specifications. Replace switch if readings are out of range or erratic.
6
Step 6: After repairs, clear codes, cycle window through full range of motion multiple times, and verify code does not return. Test auto-up/down features if equipped and verify proper operation.
Estimated Repair Cost
$150 - $550
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected a fault in the rear right (passenger side) power window motor circuit. The BCM monitors voltage, current draw, and circuit continuity when the window switch is activated, and has identified an abnormal condition such as an open circuit, ...
The most common cause of B1422 (Power Window RR Motor Circuit Failure) is: Failed or seized rear right window motor with high resistance or internal short
Typical repair costs for B1422 range from $150 to $550, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive as this only affects rear passenger window operation. This is primarily a convenience issue, though it may pose minor security concerns if window cannot be closed, and may allow water intrusion during rain.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1422 to identify the root cause.
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Quick Info
Category
Body
System
Body Electrical System - Power Windows
Difficulty
Type
Manufacturer
Recommended Tools
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