What does it mean?
B1912 is a Body (airbags, seat belts, body electronics) fault code. It indicates: Outside Mirror - Right horizontal Motor or Sensor .
Symptoms
- Right mirror will not swing left or right while vertical adjustment still works
- Motor buzzes without moving the glass
- Memory recall does not restore the correct horizontal position
- Adjustment stops working after the passenger door has been opened and closed several times
- The mirror may move in one direction only
Likely causes
- Horizontal motor seized or worn inside the right mirror actuator
- Broken gear teeth or a cracked glass carrier after the mirror was folded or struck
- Worn position potentiometer on memory equipped mirrors
- Chafed or broken wiring in the passenger door jamb boot
- Corroded mirror connector after water entered the door
- Ice, dirt or a trim clip preventing the glass from moving
- Passenger door module or memory module output failure
How to fix it
- Operate both mirrors in all directions and note exactly which movement fails
- Clear any ice or obstruction and check the glass moves freely by hand before dismantling
- Read the codes and observe mirror position live data while making adjustments
- Measure the command voltage at the mirror connector while the switch is used, to separate a module fault from an actuator fault
- Flex the passenger door jamb harness while monitoring to expose broken conductors
- Repair the wiring first, then replace the mirror actuator or glass carrier if the motor or sensor is proven faulty
- Replace the controlling module only as the final step