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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 143 (Fixed And MOVEABLE Windows) >> Diagnostic Information and Procedures >> Rear Window Defogger Malfunction >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.

When the rear window defogger switch is pressed, the K9 Body Control Module will provide B+ to the control circuit 193 which energizes the PCB KR5 Rear Window Defogger Relay. Battery positive voltage is supplied at all times to the relay switched input and the relay coil is always grounded. This allows battery positive voltage from the relay switched input to flow through the switch contacts and out the relay switched output to the control circuit 293.

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