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.
Electronic Automatic Temperature Control (EATC) Module
The EATC module (if equipped) uses the SCP communications network for communication with the diagnostic tool and other modules on the SCP communications network. The EATC module controls the automatic climate functions that maintain the vehicle interior temperature at a constant setting.
Check the SCP communications network circuits between the EATC module C228a and the DLC C251. The total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the SCP communications network, damage to the DLC C251, or damage to the EATC module C228a.
For additional climate control assembly information, refer to CLIMATE CONTROL SYSTEM-GENERAL INFORMATION & DIAGNOSIS .
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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.