What does it mean?
B1934 is a Body (airbags, seat belts, body electronics) fault code. It indicates: Driver Door Lock/Unlock Switch Circuit Stuck .
Symptoms
- Doors lock or unlock repeatedly on their own, or cycle when the door is opened
- The key fob and keyless entry are ignored, because a held switch input overrides them
- The lock button on the driver door does nothing at all
- Actuators buzz or click continuously and can eventually overheat
- Battery goes flat after the car sits, because the module never goes to sleep
Likely causes
- Liquid spilled into the driver door lock switch, leaving the contacts bridged
- Worn or carbon fouled contacts inside the switch that no longer release
- Switch mechanically jammed by a broken button or a distorted door trim panel
- Switch signal wire shorted to ground between the door panel and the module
- Chafed harness inside the door jamb boot where the wires flex with every door opening
- Water damaged door module after a torn door membrane
- Aftermarket alarm or remote start wired into the lock switch circuit
How to fix it
- Read the code and freeze frame and confirm which switch input the module reports as stuck
- Watch the lock switch state in scan tool live data while pressing and releasing the button; a stuck contact stays active
- Unplug the driver door switch: if the input returns to normal the switch is faulty, if it stays active the wiring is shorted to ground
- Inspect the switch for spilled liquid, sticky residue, a broken button and corroded terminals
- Check the trim panel is not pressing on the switch and distorting it
- Look for a torn door membrane and water damage on the door module, then dry and reseal it
- Replace the switch if its contacts are worn, and the door or body control module only after switch and wiring have both been proven good