B12AB
Drivers Heated Seat Relay Drive Circuit Shorted To Battery Voltage
B12AB is an OBD-II diagnostic trouble code meaning: Drivers Heated Seat Relay Drive Circuit Shorted To Battery Voltage. Common causes: damaged wiring harness insulation, short circuit inside the heating relay. Estimated repair cost: $33–167.
Symptoms
- Continuous operation of seat heating regardless of switch position
- Driver's seat overheating
- Discharged battery when parked for a long time
- Burning smell in the cabin
Causes
- Damaged wiring harness insulation
- Short circuit inside the heating relay
- Short circuit in the seat control unit
- Damage to wiring after repair work
- Seat temperature sensor malfunction
How to Fix
- Visual inspection of the wiring harness in the driver's seat area
- Checking Relay Control Circuit Resistance
- Diagnostics of the heating relay for internal short circuit
- Checking the contacts of the seat control unit
- Replacing damaged wires or components
- Resetting the code and checking the system operation
Related codes
FAQ
What does the B12AB code mean?
B12AB is an OBD-II diagnostic trouble code that indicates: Drivers Heated Seat Relay Drive Circuit Shorted To Battery Voltage
What causes a B12AB error code?
The most common causes of B12AB include: Damaged wiring harness insulation; Short circuit inside the heating relay; Short circuit in the seat control unit; Damage to wiring after repair work.
How do I fix a B12AB diagnostic trouble code?
To fix B12AB: Visual inspection of the wiring harness in the driver's seat area. Checking Relay Control Circuit Resistance. Diagnostics of the heating relay for internal short circuit. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with B12AB?
Limited driving only, diagnose soon
How much does it cost to fix B12AB?
The estimated repair cost for B12AB is $33–167. Actual cost depends on your vehicle, location, and labor rates.
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