Driver Mirror Switch Circuit Open
The Driver Door Module (DDM) has detected an open circuit in the driver's side mirror switch assembly. This prevents the adjustment signals (up/down, left/right) from reaching the control module, disabling the power mirror adjustment function.
1. Commonly Affected Makes
2. Most Common Causes
- Damaged or worn internal contacts in the driver mirror switch
- Open circuit in the signal, power, or ground wiring between the switch and DDM
- Loose, corroded, or damaged terminals in the door harness connectors
- Internal failure of the Driver Door Module (DDM)
3. Symptoms You Will Notice
- Driver side power mirror does not respond to adjustment controls
- Mirror may be stuck in one position or move erratically
4. Step-by-Step Diagnosis
Check for power and ground at the mirror switch connector using a multimeter
Inspect the switch and door harness connectors for corrosion, damage, or loose pins
Test continuity of the signal wires between the switch and DDM
If wiring and switch are good, test the DDM by swapping with a known good module or using a scan tool
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, it is safe to drive. The fault only affects the power mirror adjustment; the mirror itself remains in its last position and does not impact vehicle safety.
How much does it cost to fix?▼
Repair costs typically range from $100 to $400, depending on whether the switch, wiring, or DDM needs replacement and the labor rates in your area.