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.
Checking Components
Check that the following components are intact:
- Rear windshield heating fuse
- Rear windshield heating switch.
For information about fuse numbers and the number on the terminal pins, see the appropriate service information.
Checking the relay
Check that the rear windshield heating relay is correctly installed.
Also check the relay terminal, in particular terminal #5. Check for a short-circuit to ground.
Check the function of the rear windshield heating relay. Activate and deactivate the relay a number of times. The relay is functioning if there is a clicking sound when the relay is activated and deactivated.
Click the VCT2000 symbol in VIDA (Volvo scan tool) to activate and deactivate the relay.
Remedy as necessary.
Other information
Was a fault detected?
- YES
Refer to VERIFICATION
- NO
Refer to CHECKING THE COMPONENTS AND WIRING
NO RELATED
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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.