Power Mirror Fold Circuit Malfunction
What does B1108 mean?
The B1108 code means the vehicle's onboard diagnostic system has detected: Power Mirror Fold Circuit Malfunction. This is a low severity code.
Common Symptoms
- Mirrors do not fold in when button pressed
- One mirror folds but the other does not
- Grinding noise when mirror fold is activated
- Mirror fold motor runs but mirror does not move
- Mirrors do not auto-fold when vehicle locked
Probable Causes (Ranked by Likelihood)
- Failed power mirror fold motor Very High
- Stripped mirror fold gear mechanism High
- Faulty mirror fold switch or button Moderate
- Mirror fold module or BCM output failure Low
Step-by-Step Diagnostic Procedure
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Test mirror fold switch activation
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Check voltage at mirror fold motor connector
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Listen for motor running when fold is activated
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Inspect mirror fold mechanism for stripped gears
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Scan BCM for mirror fold circuit DTCs
Frequently Asked Questions
Can I manually fold a power-fold mirror?
Most power-fold mirrors can be folded by hand in an emergency, but doing so regularly can damage the fold motor gears. Use the power fold function when the system is working.
Why do power-fold mirrors use a separate motor?
The fold motor is separate from the adjustment motors. It is a higher-torque motor designed to rotate the entire mirror housing, while the adjustment motors only tilt the glass.
Will a broken fold motor affect mirror adjustment?
No. The fold motor and adjustment motors are independent. A failed fold motor will not prevent you from adjusting the mirror glass position.