OBD Guide
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B12AC

Drivers Heated Seat Relay Drive Circuit Open Or Shorted to Ground

B12AC is an OBD-II diagnostic trouble code meaning: Drivers Heated Seat Relay Drive Circuit Open Or Shorted to Ground. Common causes: broken wires in the relay control circuit, short circuit to ground. Estimated repair cost: $22–111.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$22–111 (est.)

Symptoms

  • Heated driver's seat does not work
  • Seat heating is unstable
  • The malfunction indicator on the instrument panel lights up

Causes

  • Broken wires in the relay control circuit
  • Short circuit to ground
  • Heating relay malfunction
  • Damaged wiring harness
  • Malfunction of the heating control unit

How to Fix

  1. Check fuses and replace if necessary
  2. Check the integrity of the wiring harness
  3. Measure the resistance of the relay control circuit
  4. Replace the heating relay if faulty
  5. Repair damaged wires

Related codes

B12ADB12AEB12AF

FAQ

What does the B12AC code mean?

B12AC is an OBD-II diagnostic trouble code that indicates: Drivers Heated Seat Relay Drive Circuit Open Or Shorted to Ground

What causes a B12AC error code?

The most common causes of B12AC include: Broken wires in the relay control circuit; Short circuit to ground; Heating relay malfunction; Damaged wiring harness.

How do I fix a B12AC diagnostic trouble code?

To fix B12AC: Check fuses and replace if necessary. Check the integrity of the wiring harness. Measure the resistance of the relay control circuit. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B12AC?

Limited driving only, diagnose soon

How much does it cost to fix B12AC?

The estimated repair cost for B12AC is $22–111. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat