Wiper Motor Power Source Circuit [07/2022 - ]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Wiper / Data List.
5. Read the Data List according to the display on the Techstream.

   Body Electrical > Wiper > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   Motor Power Supply Voltage	Front wiper motor assembly supply voltage status	Min.: 0 V Max.: 63 V	Almost the same as actual windshield wiper motor assembly voltage	-

   Body Electrical > Wiper > Data List 

   Tester Display
   Motor Power Supply Voltage

   Standard Voltage

   11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

OK 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [07/2022 - ] 

Result: 

NG 

See step  2

1. Disconnect the windshield wiper motor assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Windshield Wiper Motor Assembly)

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A26-4 (+B) - Body ground	Ignition switch ON	11 to 14 V
   	Less than approximately 60 seconds after ignition switch off	11 to 14 V
   	Approximately 60 seconds after ignition switch off	Below 1 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  4

Result: 

OK 

See step  3

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A26-1 (GND) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE WINDSHIELD WIPER MOTOR ASSEMBLY. Refer to  REMOVAL [10/2018 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Remove the WIPER relay.
2. Inspect the WIPER relay.

   Refer to ON-VEHICLE INSPECTION [10/2018 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE WIPER RELAY 

Result: 

OK 

See step  5

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   WIPER relay holder terminal 3 - Body ground	Ignition switch off	11 to 14 V

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1	No. 2 Engine Room Relay Block
   *a	WIPER Relay Holder Terminal

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  6

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   WIPER relay holder terminal 2 - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  7

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   WIPER relay holder terminal 5 - A26-4 (+B)	Always	Below 1 Ω
   WIPER relay holder terminal 5 or A26-4 (+B) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  8

1. Disconnect the F40 main body ECU (multiplex network body ECU) connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   WIPER relay holder terminal 1 - F40-21 (WPS)	Always	Below 1 Ω
   WIPER relay holder terminal 1 or F40-21 (WPS) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [07/2022 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR