Driver Mirror Horizontal Position Switch Circuit
Code B1737 indicates a fault in the driver's side mirror horizontal position switch circuit. This Ford-specific code is triggered when the seat control module (SCM) or mirror control module detects an abnormal, missing, or out-of-range signal from the switch circuit that controls the mirror's horizontal movement. The system monitors resistance or voltage in the switch circuit to determine the requested direction; when it cannot properly interpret this signal, the fault is recorded.
1. Commonly Affected Makes
2. Most Common Causes
- Damaged or worn driver mirror control switch
- Open, shorted, or high-resistance wiring in the horizontal switch circuit
- Corroded, loose, or moisture-contaminated switch or mirror connector
- Internal failure of the mirror motor on the horizontal axis
- Internal failure of the seat control module (SCM) or mirror module
- Shared ground issue in the mirror circuit
3. Symptoms You Will Notice
- Driver side mirror does not move horizontally (left/right)
- Mirror may move erratically or only in one direction
4. Step-by-Step Diagnosis
Check for related codes and verify symptom with mirror switch operation
Inspect the mirror control switch and connector for damage, corrosion, or loose pins
Test the switch circuit for proper resistance or voltage per manufacturer specs
Check wiring between switch, mirror motor, and control modules for opens or shorts
If wiring and switch are good, test the mirror motor horizontal function directly
If all else passes, suspect a faulty SCM or mirror module
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, it is safe to drive. The fault only affects the driver side mirror horizontal adjustment, which is a convenience feature. However, you may need to manually adjust the mirror or rely on the passenger side mirror for visibility.
How much does it cost to fix?▼
The cost varies depending on the root cause. A simple switch replacement can cost $50-$150, while wiring repairs range from $100-$300. If the mirror motor or control module needs replacement, expect $200-$500 or more.