Auto-Dimming Rearview Mirror Circuit Malfunction
What does B1417 mean?
The B1417 code means the vehicle's onboard diagnostic system has detected: Auto-Dimming Rearview Mirror Circuit Malfunction. This is a low severity code.
Common Symptoms
- Rearview mirror does not auto-dim at night
- Mirror stays dark or tinted all the time
- Mirror has spots or uneven dimming
- Compass or temperature display on mirror blank
- Mirror dims erratically
Probable Causes (Ranked by Likelihood)
- Failed auto-dimming mirror electrochromic element Very High
- Faulty mirror light sensor High
- Loose or corroded mirror wiring connector Moderate
- Mirror control circuit board failure Low
Step-by-Step Diagnostic Procedure
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Check mirror connector behind mirror mount
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Test mirror dimming response with flashlight at rear sensor
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Inspect mirror for spots or delamination
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Check power and ground at mirror connector
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Test built-in compass and display features
Frequently Asked Questions
How does an auto-dimming mirror work?
The mirror uses electrochromic gel between two layers of glass. When a rear sensor detects bright headlights behind you, it applies voltage to the gel, causing it to darken and reduce glare.
Can an auto-dimming mirror be repaired?
Generally no. If the electrochromic element has failed or developed spots, the entire mirror assembly must be replaced. The technology is sealed and not serviceable.
Will this affect my backup camera display?
If your backup camera display is integrated into the rearview mirror, a mirror failure could affect the camera display. However, most modern vehicles have the camera display in the main screen.