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.
Four-Wheel Drive (4WD) Control Module
The 4WD control module is on the high speed CAN. The 4WD control module regulates the duty cycle to the active torque coupling between FWD and 4WD when more traction is required. Check the high speed CAN circuits 1908 (WH) and 1909 (BK), between the 4WD control module C3253 and the DLC C251. 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 high speed CAN, damage to the DLC C251, damage to the 4WD control module C3253, or a problem in the in-line connector. For additional information, refer to FOUR-WHEEL DRIVE SYSTEMS .
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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.
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