Inspection Procedure

HINT:

Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL 
   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 prevent airbag and seat belt pretensioner activation.
      NOTE: After the ignition switch is turned OFF, the navigation system requires approximately 90 seconds to record various types of memory and settings. As a result, after turning the ignition switch OFF, wait 90 seconds or more before disconnecting the cable from the negative (-) battery terminal.
2. CHECK FOR OPEN IN CAN BUS WIRE (SKID CONTROL ECU WITH ACTUATOR BRANCH WIRE) 
   1. Disconnect the A17 skid control ECU with actuator connector.
   2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      STANDARD RESISTANCE SPECIFICATION TABLE
      
      

      Tester Connection	Switch Condition	Specified Condition
      A17-5 (CANH) - A17-4 (CANL)	Ignition switch OFF	54 to 69 Ω

      Fig 1: Identifying A17 Skid Control ECU With Actuator Connector Terminals

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPAIR OR REPLACE SKID CONTROL ECU BRANCH WIRE OR CONNECTOR (CANH, CANL) 

   OK: Go to Next Step 

3. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU WITH ACTUATOR - BATTERY AND BODY GROUND) 
   1. Reconnect the cable to the negative (-) battery terminal before measuring the resistances of the main wire and the branch wire.
   2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      STANDARD RESISTANCE SPECIFICATION TABLE
      
      

      Tester Connection	Condition	Specified Condition
      A17-1 (GND1) - Body ground	Always	Below 1 Ω

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

      Standard voltage 

      STANDARD VOLTAGE SPECIFICATION TABLE
      
      

      Tester Connection	Switch Condition	Specified Condition
      A17-16 (+BM) - Body ground	Always	11 to 14 V
      A17-47 (+BS) - Body ground
      A17-9 (IG1) - Body ground	Ignition switch ON

      Fig 2: Identifying A17 Skid Control ECU With Actuator Connector

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: REPLACE SKID CONTROL ECU WITH ACTUATOR  (See REMOVAL )