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.
A/C-Heater System - Automatic: Diagnosis: Calibration
If the battery has been disconnected or discharged, the A/C-heater control panel and stepper motors must be calibrated. Perform calibration, by simultaneously pressing AUTO and OFF push buttons. See Figure .
The A/C-heater control panel display will flash once to confirm that it has been calibrated. During calibration, the display shows a zero (0 ) or the number of faults found (1-5). After calibration, the A/C-heater control panel display again shows the selected temperature. Calibration and self-test takes about 30 seconds.
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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.