Rear Left Door Ajar Circuit Malfunction
What does B1013 mean?
The B1013 code means the vehicle's onboard diagnostic system has detected: Rear Left Door Ajar Circuit Malfunction. This is a low severity code.
Common Symptoms
- Rear left door ajar warning displayed
- Door ajar chime when driving with all doors shut
- Interior lights remain on
- Rear left door status incorrect on display
- Alarm system may trigger unexpectedly
Probable Causes (Ranked by Likelihood)
- Failed rear left door jamb switch Very High
- Rear left door latch not fully engaging High
- Corroded wiring at rear left door switch Moderate
- Child safety lock interfering with latch Low
Step-by-Step Diagnostic Procedure
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Test rear left door jamb switch manually
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Check door latch for proper engagement
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Inspect door wiring harness at hinge area
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Verify BCM input for rear left door
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Check child safety lock mechanism for interference
Frequently Asked Questions
Can kids accidentally cause this code?
Rear doors are more commonly opened and closed roughly, especially in family vehicles. Repeated slamming or children pulling on handles can wear out the latch or switch faster.
Does the child safety lock affect the door ajar switch?
The child safety lock itself does not affect the switch, but a misaligned latch due to a stuck child lock mechanism can prevent the door from closing completely, triggering the ajar warning.
How do I test the door jamb switch?
With the door open, manually press the switch plunger and check if the dome light turns off. If you have a scan tool, monitor the BCM door status as you press the switch.