Lexus IS250 IS220d GSE20 ALE20 - WINDSHIELD / WINDOWGLASS
WINDSHIELD DEICER SWITCH - INSPECTION
1. INSPECT WINDSHIELD DEICER SWITCH |

Disconnect the windshield deicer switch connector.
Measure the voltage and resistance according to the value(s) in the table below.
- Voltage:
Tester Connection Condition Specified Condition 1 (ILL+) - 2 (ILL-) Headlight dimmer switch OFF → ON Below 1 V → 10 to 14 V 4 (D) - 3(E) Engine switch on (IG) 10 to 14 V 5 (IG) - 3(E) Engine switch on (IG) 10 to 14 V
- Resistance:
Tester Connection Condition Specified Condition 2 (ILL-) - Body ground Always Below 1Ω 3(E) - Body ground Always Below 1Ω

Reconnect the windshield deicer connector.
Measure the voltage and resistance according to the value(s) in the table below.
- Voltage:
Tester Connection Condition Specified Condition 4 (D) - 3(E) Engine switch on (IG), windshield deicer switch OFF → ON Below 1 V → 10 to 14 V (after 15 +- 3 minutes: Below 1 V) 5 (IG) - 3(E) Engine switch on (IG), windshield deicer switch ON 10 to 14 V → Below 1 V
LEXUS IS250, IS220d / GSE20 ALE20