Wiper Switch (HI Speed) Circuit

DESCRIPTION

The main body ECU LH (cowl side J/B LH) receives a HI position signal from the windshield wiper switch assembly to operate the wiper motor at HI speed.
Even if the ECU malfunctions, this circuit structure enables it to operate the wiper in HI operation mode.

WIRING DIAGRAM

INSPECTION PROCEDURE

1. CHECK MAIN BODY ECU LH (COWL SIDE J/B LH)

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

   Standard voltage:

   Tester Connection	Condition	Specified Condition
   Q2-11 (2S) - Body ground	Wiper switch not in HI position	10 to 14 V
   Q2-11 (2S) - Body ground	Wiper switch in HI position	Below 1 V

NG	Go to step 2

OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

2. INSPECT WINDSHIELD WIPER SWITCH ASSEMBLY (COMBINATION SWITCH ECU)

1. Measure the resistance according to the value(s) in the table below.

   Standard resistance:

   Tester Connection	Condition	Specified Condition
   3 (2S) - 5 (E)	Wiper switch in HI position	Below 1 Ω
   3 (2S) - 5 (E)	Wiper switch not in HI position	10 kΩ or higher

NG	REPLACE WINDSHIELD WIPER SWITCH ASSEMBLY

OK

3. CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER SWITCH - BODY GROUND)

1. Disconnect the J26 windshield wiper switch assembly connector.

2. Measure the resistance according to the value(s) in the table below.

   Standard resistance:

   Tester Connection	Condition	Specified Condition
   J26-5 (E) - Body ground	Always	Below 1 Ω

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4. CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER SWITCH - MAIN BODY ECU LH (COWL SIDE J/B))

1. Disconnect the Q2 main body ECU LH (cowl side J/B LH) connector.

2. Measure the resistance according to the value(s) in the table below.

   Standard resistance:

   Tester Connection	Condition	Specified Condition
   J26-3 (2S) - Q2-11 (2S)	Always	Below 1 Ω
   Q2-11 (2S) - Body ground	Always	10 kΩ or higher

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE