Certification ECU Communication Stop Mode [03/2017 - ]: Procedure

1. Disconnect the cable from the negative (-) battery terminal.
2. Disconnect the D41 and D48 certification ECU (smart key ECU assembly) connectors.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D41-14 (CANH) - D41-15 (CANL)	Cable disconnected from negative (-) battery terminal	57 to 63 Ω

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Certification ECU (Smart Key ECU Assembly))

Result: 

NG 

REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) ASSEMBLY) 

Result: 

OK 

See step  2

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D48-11 (GND) - Body ground	Cable disconnected from negative (-) battery terminal	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Certification ECU (Smart Key ECU Assembly))

2. Connect the cable to the negative (-) battery terminal.
3. Connect the D41 and D48 certification ECU (smart key ECU assembly) connectors.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   TEXT IN ILLUSTRATION
   
   

   *a

   Component with harness connected (Certification ECU (Smart Key ECU Assembly))

   -

   -

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   D41-5 (IG2) - Body ground	Engine switch on (IG)	11 to 14 V
   D48-2 (+B) - Body ground	Engine switch off	11 to 14 V

Result: 

OK 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [03/2017 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)