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.
Control System Logic
The climate control system controls are in one or more locations depending on vehicle option content:
- FCIM (Dual Automatic Temperature Control (DATC) system)
- FDIM (part of APIM)
When the FDIM touchscreen or voice commands are Used and A/C is selected, the APIM sends the request message over the HS-CAN3 to the GWM. The GWM relays the request to the FCIM over the MS-CAN, and the GWM sends the request to the PCM over the HS-CAN1. The PCM controls the A/C clutch relay.
When the customer directly inputs an A/C request into the FCIM, the module sends the request to the GWM over the MS-CAN, and the GWM sends the request to the PCM over the HS-CAN1. The PCM controls the A/C clutch relay.
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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.