Skid Control ECU Communication Stop Mode [10/2014 - 09/2017]: Procedure

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Brake Booster with Master Cylinder Assembly [Skid Control ECU])

2. Disconnect the brake booster with master cylinder assembly (skid control ECU) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A57-37 (CA1H) - A57-38 (CA1L)	Cable disconnected from negative (-) auxiliary battery terminal	54 to 69 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (SKID CONTROL ECU) 

Result: 

OK 

See step  2

1. Reconnect the cable to the negative (-) auxiliary battery terminal.
   NOTE:

   When disconnecting the cable, some systems need to be initialized after the cable is reconnected.

   Refer to INITIALIZATION [10/2014 - 09/2017]

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Brake Booster with Master Cylinder Assembly [Skid Control ECU])

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   A57-15 (BS) - Body ground	Power switch off	11 to 14 V
   A57-14 (B1) - Body ground	Power switch off	11 to 14 V
   A57-16 (IG1) - Body ground	Power switch on (IG)	11 to 14 V
   A57-12 (IG2) - Body ground	Power switch on (IG)	11 to 14 V

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A57-28 (GND) - Body ground	Always	Below 1 Ω
   A57-27 (GND2) - Body ground	Always	Below 1 Ω
   A57-26 (GND3) - Body ground	Always	Below 1 Ω
   A57-25 (GND4) - Body ground	Always	Below 1 Ω
   A57-24 (GND5) - Body ground	Always	Below 1 Ω
   A57-23 (GND6) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY. Refer to  REMOVAL [10/2014 - 09/2015]  , or refer to  REMOVAL [09/2015 - 05/2019] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR