Right Headlamp Circuit Open
What does B1002 mean?
The B1002 code means the vehicle's onboard diagnostic system has detected: Right Headlamp Circuit Open. This is a moderate severity code.
Common Symptoms
- Right headlight not illuminating
- Dashboard headlight warning on
- Only left headlight working
- Right headlight flickers intermittently
- Reduced nighttime visibility on right side
Probable Causes (Ranked by Likelihood)
- Burned out right headlight bulb Very High
- Corroded or melted bulb socket High
- Broken wiring to right headlight Moderate
- Faulty headlight relay or fuse Moderate
- BCM output circuit failure Low
Step-by-Step Diagnostic Procedure
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Inspect right headlight bulb visually
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Check bulb socket for damage or corrosion
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Test voltage at right headlight connector
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Inspect wiring from fuse box to right headlight
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Verify headlight relay and fuse are functional
Frequently Asked Questions
Should I replace both headlight bulbs at the same time?
It is generally recommended to replace both bulbs together. If one has burned out, the other is likely near the end of its life as well, and the new bulb will be brighter than the older one.
Can I get pulled over for a burned out headlight?
Yes. Driving with one headlight is a traffic violation in most jurisdictions and can result in a fix-it ticket or fine.
What type of bulb do I need?
Bulb type varies by vehicle. Check your owner's manual or a parts store bulb guide for the correct type. Common types include H11, 9005, 9006, and H7.