Defogger Switch Circuit
WARNING: This page is about a different car, the 2003 Lexus GS 430, 2003 Lexus GS 300, 2002 Lexus GS 430, and 2002 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.
Inspect the defogger switch in the A/C control assembly circuit. Disconnect the connector from the A/C control assembly and inspect the connector on the wire harness side. See INSPECTING DEFOGGER SWITCH CIRCUIT table. See CONNECTOR IDENTIFICATION . If the circuit is not as specified, replace the switch. See DEFOGGER SWITCH under REMOVAL & INSTALLATION.
INSPECTING DEFOGGER SWITCH CIRCUIT
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| B10 - Ground | Constant | Continuity |
| A1 - Ground | Constant | Battery Voltage |
| A2 - Ground | Ignition Switch LOCK | No Voltage |
| A2 - Ground | Ignition Switch ACC Or ON | Battery Voltage |