Rear Left Side Door Ajar Sensor Circuit
Indicates that the rear left side door is not closing properly or the sensor circuit is faulty.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The vehicle thinks the rear left door is open when it should be closed, likely due to a bad switch or wiring issue.
What the computer is actually seeing
The Body Control Module (BCM) receives input from the door ajar switch. If the switch stays in the open position when the door is closed, it triggers the fault code.
What a healthy reading looks like
Door ajar switch should show closed state (0 volts) when the door is shut, and open state (approximately 12 volts) when it's open.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Inspect the rear left door for any physical obstruction or misalignment that could prevent closure. Decision: Is the door properly aligned? (Yes: proceed; No: realign and retest)
- 22. Check the wiring and connectors at the door for damage or corrosion. Decision: Is wiring intact and connectors clean? (Yes: proceed; No: repair or replace wiring/connectors)
- 33. Test the door ajar switch for proper operation. It should show 0 volts when the door is closed. Decision: Does switch function correctly? (Yes: proceed; No: replace switch)
- 44. Verify BCM functionality; check for software updates or faults. Decision: Is BCM operational with no unusual codes? (Yes: concern resolved; No: consider BCM replacement)
Common causes
- Faulty door ajar switch
- Wiring issues in the door harness
- Damaged BCM
- Misaligned door or striker
- Corrosion at connectors
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, but the warning light may stay on and the door chime may sound.
Will this code come back after a reset?
If the underlying issue isn't fixed, it will likely return.
Why does this code pair with B1485?
Both codes relate to door ajar sensors, indicating issues with adjacent doors or related wiring.
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