Passenger Mirror Horizontal Switch Circuit Fault
The B1745 code indicates a fault in the passenger side mirror horizontal adjustment switch circuit. The body control module (BCM) or mirror control module has detected an electrical anomaly—such as an open circuit, short to ground, or short to voltage—in the circuit that controls left/right movement of the passenger mirror. This prevents the mirror from adjusting horizontally as commanded.
1. Commonly Affected Makes
2. Most Common Causes
- Faulty or corroded mirror adjustment switch
- Short or open circuit in the mirror wiring harness
- Loose, corroded, or damaged electrical connectors
- Defective passenger mirror horizontal motor
- Failed body control module (BCM)
3. Symptoms You Will Notice
- Passenger mirror does not move left or right
- Mirror moves erratically or only in one direction
4. Step-by-Step Diagnosis
Scan for codes and verify B1745 is present
Inspect mirror switch for corrosion or damage
Check wiring and connectors between switch and mirror for shorts or opens
Test mirror horizontal motor by applying power directly
If all else passes, test BCM for proper output signals
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, it is safe to drive. The fault only affects passenger mirror adjustment and does not impact vehicle safety or drivability.
How much does it cost to fix?▼
Repair costs typically range from $50 to $300, depending on whether the issue is a simple switch replacement or a more involved wiring repair or BCM replacement.