Rear Door Lock Actuator Circuit Malfunction
What does B1019 mean?
The B1019 code means the vehicle's onboard diagnostic system has detected: Rear Door Lock Actuator Circuit Malfunction. This is a low severity code.
Common Symptoms
- One or more rear doors do not lock electrically
- Key fob cannot lock or unlock rear doors
- Rear door lock clicks but does not engage
- Rear door child safety locks not functioning
- Power lock button does not operate rear doors
Probable Causes (Ranked by Likelihood)
- Failed rear door lock actuator motor Very High
- Wiring damage in rear door hinge area High
- Corroded rear door actuator connector Moderate
- Body control module rear lock output fault Low
Step-by-Step Diagnostic Procedure
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Test rear door locks from driver switch and key fob
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Listen for actuator noise in affected rear door
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Check voltage at rear door actuator connector
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Inspect wiring at door hinge boot for breaks
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Scan BCM for rear door lock DTCs
Frequently Asked Questions
Can a failed rear lock actuator be a security risk?
If the door cannot lock electrically, it may remain unlocked when you think all doors are secured. Always verify all doors are locked if you suspect a rear actuator failure.
Are rear door actuators different from front?
Rear door actuators are often similar in design but may have additional features like child safety lock integration. The part number is usually specific to each door position.
Why do rear actuators fail?
Door lock actuators are small electric motors that endure thousands of cycles over the life of the vehicle. Internal gears wear down and motors burn out from normal use.