Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2009 Ford Focus S, AutomaticFACTORY OEM SERVICE PROCEDURE
Seating DTCS
HVAC MODULE DIAGNOSTIC TROUBLE CODES (DTC) LIST
| DTC | Description | Action |
|---|---|---|
| B12AB | Drivers Heated Seat Relay Drive Circuit Shorted to Battery Voltage | Go to Pinpoint Test B . |
| B12AC | Drivers Heated Seat Relay Drive Circuit Open or Shorted to Ground | If the driver heated seat does not heat, go to Pinpoint Test B
. If the driver heated seat will not shut off, go to Pinpoint Test D . |
| B12AD | Passenger Heated Seat Relay Drive Circuit Shorted to Battery Voltage | Go to Pinpoint Test C . |
| B12AE | Passenger Heated Seat Relay Drive Circuit Open or Shorted to Ground | If the passenger heated seat does not heat, go to Pinpoint Test C
. If the passenger heated seat will not shut off, go to Pinpoint Test D . |
| All Other DTCs | - | REFER to MULTIFUNCTION ELECTRONIC MODULES article. |
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.