B1776: Driver Mirror Up Circuit Short to Ground
The B1776 code indicates that the Body Control Module (BCM) or Driver Door Module (DDM) has detected a short to ground in the driver's exterior mirror 'Up' control circuit. This prevents the mirror from moving upward and may disable memory or folding functions.
1. Commonly Affected Makes
2. Most Common Causes
- Chafed or pinched wiring in the mirror Up circuit contacting chassis/body ground
- Internal short in the driver door mirror switch
- Mirror motor winding shorted to ground
- Moisture or corrosion in the mirror or door panel connector bridging terminals
- Faulty DDM or BCM with internal driver short
3. Symptoms You Will Notice
- Driver side mirror does not move upward
- Mirror memory or folding function may be inoperative
4. Step-by-Step Diagnosis
Scan for B1776 and related codes; check DDM/BCM data for mirror switch inputs
Visually inspect mirror wiring harness for damage or rubbing against metal
Test mirror Up circuit for continuity to ground with multimeter
Disconnect mirror motor and check for short; if clear, test switch and wiring
If all else passes, suspect DDM/BCM fault and perform module self-test or replacement
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, it is safe to drive. The fault only affects the driver mirror's upward adjustment and possibly memory/folding functions. However, you may want to fix it for convenience and to prevent further electrical issues.
How much does it cost to fix?▼
Costs vary: simple wiring repair $50-$150, switch replacement $100-$250, mirror motor $150-$400, or DDM/BCM replacement $300-$800 plus labor. Diagnosis is typically $100-$150.