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.
Auxiliary HVAC Control Functions
All Auxiliary functions and DTCs are handled by the HVAC Control Module. There are two ways the rear functions can be controlled.
Control from the HVAC Control Module: If the AUX button on the HVAC Control Module is pressed, the auxiliary HVAC system will be enabled. The settings for the auxiliary will mimic the driver settings on the HVAC control module.
Control from the Auxiliary HVAC Control Module: If at any time any of the three auxiliary controls are adjusted, control of the rear HVAC system will transfer to the auxiliary controls. If the Aux button is not currently enabled, adjusting the auxiliary controls will enable it, even if the front system is OFF.
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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.