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.
Rear Window Defogger Relay, Windshield Defogger Control Module, Rear Window Defogger Fuse, Windshield Defogger
J9
Rear Window Defogger Relay
J393
Comfort System Central Control Module
J505
Windshield Defogger Control Module
S41
Rear Window Defogger Fuse
S372
Wire Junction Fuse 2
T2bz
2-Pin Connector, Black
T12h
12-Pin Connector, Black
T32i
32-Pin Connector, Black, Naturally Cloudy
TV1
Wire Junction
Z2
Windshield Defogger
61
Ground Connection on Left C-Pillar
389
Ground Connection 24 (in Main Wiring Harness)
675
Ground Connection 2 in Luggage Compartment on Right Side
729
Ground Connection on Left Rear Wheel Housing
B298
Positive Connection 2 (30) (in Main Wiring Harness)
B843
LIN Bus Connection 9 (in Main Wiring Harness)
*
Refer to Applicable Wiring Diagram for Fuse Positions
*2
Depending on Equipment
*3
Sedan
*4
For Vehicles with Hybrid Drive
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.