Inspection Procedure

WARNING: This page is about a different car, the 2008 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

Before starting the following procedure, check that multiplex communication system (MPX) DTCs are not output (See DIAGNOSTIC TROUBLE CODE CHART ).

READ VALUE USING TECHSTREAM

Connect the Techstream to the DLC3
Turn the engine switch on (IG).
Turn the Techstream on.
Enter the following menus: Body Electrical / Combination Switch / Data List

Read the display on the Techstream.

Combination Switch (Windshield Wiper Switch Assembly)

DIAGNOSTIC NOTE REFERENCE CHART

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Front Washer Switch	Front washer switch / ON or OFF	ON. Front washer switch ON OFF Front washer switch OFF	-
Front Wiper Mist Switch	Front wiper MIST switch / ON or OFF	ON Front wiper switch in MIST OFF Wiper switch not in MIST	-
Front Wiper Auto Switch	Front wiper AUTO switch / ON or OFF	ON Front wiper switch in AUTO position OFF Wiper switch not in AUTO position	-
Front Wiper Hi Switch	Front wiper HI switch / ON or OFF	ON Front wiper switch in HI OFF Wiper switch not in HI	-
Front Wiper Lo Switch	Front wiper LO switch / ON or OFF	ON Front wiper switch in LO OFF Wiper switch not in LO	-
Ignition Switch Signal	Engine switch signal / ON or OFF	ON Engine switch on (IG) OFF Engine switch off	-
Wiper Volume Position	Front wiper volume (sensitivity) / 0 to 90 degrees	0 degrees FR wiper volume "+" position 27 degrees Switch is turned one notch towards the "-" side from the FR wiper volume "+" position 63 degrees Switch is turned one notch towards the "+" side from the FR wiper volume "-" position 90 degrees FR wiper volume "-" position	If the value is NG, replace the windshield wiper switch assembly (See WIPER SWITCH )

NG: Go to step 2

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (See PROBLEM SYMPTOMS TABLE )

CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER SWITCH ASSEMBLY BATTERY AND BODY GROUND)

Disconnect the J26 windshield wiper switch assembly connector.

Measure the voltage according to the value(s) in the table below

Standard Voltage

TESTER CONNECTION TESTER CONNECTION CHART

Tester Connection	Condition	Specified Condition
J26-1 (B) - J26-5 (E)	Always	11 to 14 V

Fig 1: Identifying J26 Connector Terminal

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE WINDSHIELD WIPER SWITCH ASSEMBLY (See WIPER SWITCH )