Mazda B12AB: Drivers Heated Seat Relay Drive Circuit Shorted to Battery Voltage

Is your scanner showing Mazda B12AB?
No worries. We'll show you what it means and how to deal with it.

Presented by
Randy Worner

Mazda B12AB: Drivers Heated Seat Relay Drive Circuit Shorted to Battery Voltage

OVERVIEW
Severity
:
Medium
DIY Difficulty Level
:
Intermediate
Repair Cost
:
$250-$350
Can I Still Drive?
:
Yes (Short-term only)

What Does The Mazda B12AB Code Mean?

The driver’s seat heated relay drive circuit is shorted to battery voltage. The heated seat is inoperative or does not operate correctly. If the driver heated seat relay drive circuit is shorted to voltage and the HVAC module attempts to activate the driver heated seat relay, the DTC will set and the seat will fail to heat or intermittently heat.

What Are The Potential Causes Of The Mazda B12AB Code?

  • Wiring, terminals or connectors
  • Heated seat relay
  • Heated seat element
  • HVAC module

Recommended Parts

Below are some recommended auto parts to help you address the trouble code affecting your vehicle and get it running smoothly again:

>>> WORKPRO 582-piece Crimp Terminals, Wire Connectors, Heat Shrink Tube, Electrical Repair Kit
>>> Twippo 372Pcs Waterproof Wire Connectors Kit
>>> Mazda A-Premium HVAC Heater Blend Door Actuator
>>> Cx-9 Heater Control

Note: During the purchasing process, please check carefully whether the part you want to buy fits your car!

Reference Sources

Mazda B12AB, DTCDECODE.

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