Inspection Procedure

WARNING: This page is about a different car, the 2004 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.

Check pattern select switch.
PREPARATION:

Disconnect the pattern select switch connector.

CHECK:

Check continuity between each terminal of pattern select switch connector when the select switch is set to PWR, NORM and SNOW positions.

Fig 1: Checking Pattern Select Switch
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OK:

If the continuity is not as specified, replace the switch.

Fig 2: Pattern Select Switch Connector Continuity
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1. NG: Replace pattern select switch.
2. OK: Go to Next Step
Check harness and connector between pattern select switch and body ECU No. 1, pattern select switch and body ground (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
1. NG: Repair or replace the harness or connector.
2. OK: Go to next step.
  Proceed to next circuit inspection shown on problem symptoms table (See PROBLEM SYMPTOMS TABLE )