Wiper and Washer Switch Circuit: Procedure
- INSPECT WINDSHIELD WIPER SWITCH ASSEMBLY
- Remove the windshield wiper switch assembly. Refer to REMOVAL [08/2012 - ] .
- Measure the resistance according to the value(s) in the table below.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
TEXT IN ILLUSTRATION*a Component without harness connected
(Windshield Wiper Switch Assembly)Standard Resistance
Front Washer Switch
Adjusting Ring*1
FRONT WIPER SWITCHTester Connection Switch Condition Specified Condition H27-3 (+1) - H27-1 (+S) OFF Below 1 Ω H27-3 (+1) - H27-2 (+B) MIST LO H27-2 (+B) - H27-4 (+2) HI H27-9 (AUTO) - H27-10 (E) AUTO*1 Tester Connection Switch Condition Specified Condition H28-2 (EW) - H28-3 (WF) ON Below 1 Ω OFF 10 kΩ or higher Tester Connection Condition Specified Condition H27-7 (VR1) - H27-8 (VR2) Adjusting ring changed from (+) side to (-) side 0 to 2.7 kΩ - *1: w/ Rain Sensor
NG → See step 3
OK: Go to next step
- CHECK HARNESS AND CONNECTOR (WIPER SWITCH - WIPER RELAY AND BODY GROUND)
- Disconnect the H28 and H27 windshield wiper switch assembly connectors.
- Disconnect the H75 windshield wiper relay assembly connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition H27-2 (+B) - H75-12 (IG) Always Below 1 Ω H27-2 (+B) - Body ground Always 10 kΩ or higher H27-3 (+1) - H75-1 (+2S) Always Below 1 Ω H27-3 (+1) - Body ground Always 10 kΩ or higher H27-4 (+2) - H75-3 (+2) Always Below 1 Ω H27-4 (+2) - Body ground Always 10 kΩ or higher H27-1 (+S) - H75-11 (+SSW) Always Below 1 Ω H27-1 (+S) - Body ground Always 10 kΩ or higher H27-9 (AUTO)*1 - H75-17 (C1) Always Below 1 Ω H27-9 (AUTO)*1 - Body ground Always 10 kΩ or higher H27-10 (E) - H75-16 (CO) Always Below 1 Ω H27-10 (E) - Body ground Always 10 kΩ or higher H27-7 (VR1)*1 - H75-7 (VR1) Always Below 1 Ω H27-7 (VR1)*1 - Body ground Always 10 kΩ or higher H27-8 (VR2)*1 - H75-6 (VR2) Always Below 1 Ω H27-8 (VR2)*1 - Body ground Always 10 kΩ or higher H28-3 (WF) - H75-4 (W) Always Below 1 Ω H28-3 (WF) - Body ground Always 10 kΩ or higher H28-2 (EW) - Body ground Always Below 1 Ω - *1: w/ Rain Sensor
NG → REPAIR OR REPLACE HARNESS OR CONNECTOR
OK → See step 4
- REPLACE WINDSHIELD WIPER SWITCH ASSEMBLY. Refer to REMOVAL [08/2012 - ]
- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to PROBLEM SYMPTOMS TABLE [08/2012 - ]