What Does B1637 Mean?
This code indicates the Body Control Module (BCM) has detected a short to battery voltage in the power mirror driver circuit for the right side mirror. The mirror motor control circuit is receiving constant battery voltage when it should not be, suggesting a wiring fault or internal mirror motor short. This prevents proper mirror adjustment operation on the driver's right (passenger side in left-hand drive vehicles).
Common Causes
45%
Damaged or chafed wiring harness between BCM and right mirror causing short to power
30%
Failed power mirror motor with internal short to power in right mirror assembly
15%
Corroded or damaged mirror connector terminals causing cross-circuit short
10%
Failed BCM with internal driver circuit fault
Diagnostic Steps
1
Step 1: Perform visual inspection of right mirror wiring harness from door jamb through door and to mirror. Look for pinched, chafed, or damaged wire insulation, especially at flex points. Check for aftermarket accessory wiring spliced into mirror circuits.
2
Step 2: Disconnect the right mirror connector and measure voltage on the BCM side motor control circuits with ignition on. Should read 0V; if battery voltage present, trace wiring back toward BCM for short to power in harness.
3
Step 3: With mirror disconnected, use multimeter to measure resistance between mirror motor terminals and power supply pin. Should read open circuit or very high resistance; low resistance indicates internal motor short.
4
Step 4: If wiring and mirror test good, check BCM connector terminals for corrosion, backed-out pins, or moisture. Inspect BCM ground connections for integrity. Use bidirectional controls to command mirror movement while monitoring circuit voltage.
5
Step 5: After repair, clear codes, cycle mirror through full range of motion in all directions, and verify no voltage present on control circuits when mirror not commanded to move. Road test and recheck for code return.
Estimated Repair Cost
$150 - $650
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected a short to battery voltage in the power mirror driver circuit for the right side mirror. The mirror motor control circuit is receiving constant battery voltage when it should not be, suggesting a wiring fault or internal mirror motor sho...
The most common cause of B1637 (Mirror Driver Right Circuit Short To Battery) is: Damaged or chafed wiring harness between BCM and right mirror causing short to power
Typical repair costs for B1637 range from $150 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to continue driving as this only affects power mirror adjustment functionality. Mirror can still be adjusted manually on most vehicles, though visibility may be compromised if mirror position is incorrect. Non-urgent repair.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1637 to identify the root cause.
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Quick Info
Category
Body
System
Body Electrical System
Difficulty
Type
Manufacturer
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