Measure the resistance of the DEFOG relay.

Measure the resistance of the windshield deicer relay.

Disconnect the windshield deicer switch connector.

Select the DTC check on the intelligent tester to check for communication errors.

Clean the broken wire tips with a grease, wax and silicone remover.

When the engine switch is turned on (IG) and the defogger switch is pressed, check that the rear window defogger operates.

Connect the intelligent tester (with CAN VIM) to the DLC3.

The defogger system data can be read from the Data Link Connector 3 (DLC3) of the vehicle. When the system seems to be malfunctioning, use the intelligent tester to check for malfunctions and perform repairs.

Measure the voltage and resistance of each terminal of the connectors.

Lexus IS250 IS220d GSE20 ALE20 WINDSHIELD / WINDOWGLASS