Inspection Procedure

1. Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire and the branch wire.
   CAUTION: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
   NOTE:

   • w/ Navigation System:

     After the engine switch is turned off, the HDD navigation system requires approximately 6 minutes to record various types of memory and settings. As a result, after turning the engine switch off, wait 6 minutes or more before disconnecting the cable from the negative (-) battery terminal.

   • When disconnecting the cable, some systems need to be initialized after the cable is reconnected (See INITIALIZATION ).

1. Disconnect the E90 windshield wiper ECU connector.
2. Measure the resistance according to the value(s) in the table below.

Standard Resistance 

Fig 1: Checking For Open In CAN Bus Wire (Windshield Wiper ECU Branch Wire)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE WINDSHIELD WIPER ECU BRANCH WIRE OR CONNECTOR (CANH, CANL) 

OK: Go to next step 

1. Connect the cable to the negative (-) battery terminal.
   NOTE: When disconnecting the cable, some systems need to be initialized after the cable is reconnected (See INITIALIZATION ).
2. Disconnect the E89 and E90 windshield wiper ECU connectors.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   E90-10 (E) - Body ground	Always	Below 1 Ω

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

Standard Voltage 

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

Fig 2: Checking Harness And Connector (Windshield Wiper ECU - Battery And Body Ground)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: REPLACE WINDSHIELD WIPER ECU  (See REMOVAL )