Power Source Mode does not Change to ON (IG) (07/2015 -): Procedure

1. Disconnect the A36 certification ECU (smart key ECU assembly) connector.
2. Disconnect the 1C and 1E No. 1 integration relay connectors.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A36-9 (IG2D) - 1C-8	Always	Below 1 Ω
   1E-2 - Body ground	Always	Below 1 Ω
   A36-9 (IG2D) or 1C-8 - Body ground	Always	10 kΩ or higher

Result:  NG

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result:  OK

OK 

See step  2

1. Remove the No. 1 integration relay (Refer to REMOVAL (07/2015 -) ).
2. Inspect the No. 1 integration relay (Refer to INSPECTION (07/2015 -) ).

Result:  NG

NG 

REPLACE NO. 1 INTEGRATION RELAY 

(Refer to REMOVAL (07/2015 -) )

Result:  OK

OK 

See step  3

1. Disconnect the H56 certification ECU (smart key ECU assembly) connector.
2. Disconnect the 3A instrument panel junction block assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   H56-6 (IG1D) - 3A-27	Always	Below 1 Ω
   3B-7 - Body ground	Always	Below 1 Ω
   H56-6 (IG1D) and 3A-27 - Body ground	Always	10 kΩ or higher

Result:  NG

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result:  OK

OK 

See step  4

1. Remove the instrument panel junction block assembly (Refer to REMOVAL (07/2015 -) ).
2. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly (Refer to REMOVAL (07/2015 -) ).
3. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   TEXT IN ILLUSTRATION
   
   

   *a

   Component without harness connected (Instrument Panel Junction Block Assembly)

   -

   -

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3E-1 - 3D-33 (IG1 No. 1 relay) 3E-1 - 3D-36 (IG1 No. 2 relay) 3E-1 - 3C-4 (IG1 No. 3 relay) 3E-1 - 3C-14 (IG1 No. 4 relay)	Battery voltage not applied to terminals 3A-27 and 3B-7	10 kΩ or higher
   	Battery voltage applied to terminals 3A-27 and 3B-7	Below 1 Ω

Result:  NG

NG 

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 

(Refer to REMOVAL (07/2015 -) )

Result:  OK

OK 

See step  5

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   TEXT IN ILLUSTRATION
   
   

   *a

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

   -

   -

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A36-9 (IG2D) - Body ground	Engine switch on (ACC) → Engine switch on (IG)	1 V or less → 9 V or higher
   H56-6 (IG1D) - Body ground	Engine switch on (ACC) → Engine switch on (IG)	1 V or less → 9 V or higher

Result:  OK

OK 

CHECK RELAY CONTACT SIDE CIRCUIT 

Result:  NG

NG 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 

(Refer to REMOVAL (07/2015 -) )