Steering Control ECU Communication Stop Mode [09/2014 - 10/2015]: Procedure

1. Disconnect the cable from the negative (-) battery terminal.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Disconnect the front steering control ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   N104-3 (CNH1) - N104-9 (CNL1)	Cable disconnected from negative (-) battery terminal	54 to 69 Ω

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Front Steering Control ECU)

Result: 

NG 

REPAIR OR REPLACE STEERING CONTROL ECU CAN BRANCH WIRE OR CONNECTOR (CNH1, CNL1) 

Result: 

OK 

See step  2

1. Connect the cable to the negative (-) battery terminal.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NOTE:

   When connecting the cable, some systems need to be initialized after the cable is reconnected (Refer to INITIALIZATION [09/2014 - 10/2015] ).

2. Disconnect the front steering control ECU connector.
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A31-2 (PIG) - Body ground	Always	11 to 14 V
   N104-7 (+BI) - Body ground	Always	11 to 14 V
   N104-4 (IG) - Body ground	Engine switch on (IG)	11 to 14 V

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A31-1 (PGND) - Body ground	Always	Below 1 Ω
   N104-13 (PGD2) - Body ground	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Front Steering Control ECU)

Result: 

OK 

REPLACE FRONT STEERING CONTROL ECU 

(Refer to REMOVAL [09/2014 - ] )

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR