Power Source Mode does not Change to ON (IG): Procedure

1. Disconnect the D48 certification ECU (smart key ECU assembly) connector.
2. Remove the IG2 relay from the engine room relay block.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D48-9 (IG2D) - IG2 relay terminal 2	Always	Below 1 Ω
   IG2 relay terminal 1 - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Inspect the IG2 relay. Refer to ON-VEHICLE INSPECTION [03/2012 - ] .

NG → REPLACE IG2 RELAY 

OK: Go to next step 

1. Disconnect the D41 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	Connection	Specified Condition
   D41-6 (IG1D) - 3A-15	Always	Below 1 Ω
   3A-12 - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Remove the instrument panel junction block assembly. Refer to REMOVAL [03/2012 - ] .
2. Remove the main body ECU (network gateway ECU) from the instrument panel junction block assembly.
3. Measure the resistance according to the value(s) in the table below.
   Fig 1: Inspecting Instrument Panel Junction Block Assembly ((IG1 NO. 1, IG1 NO. 2, IG1 NO. 3 Relay)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *a

   Component without harness connected (Instrument Panel Junction Block Assembly)

   -

   -

   Standard Resistance

   Tester Connection	Connection	Specified Condition
   3E-1 - 3C-35	Battery voltage not applied to terminals 3A- 15 and 3A-12	10 kΩ or higher
   	Battery voltage applied to terminals 3A- 15 and 3A-12	Below 1 Ω
   3E-1 - 3C-34	Battery voltage not applied to terminals 3A- 15 and 3A-12	10 kΩ or higher
   	Battery voltage applied to terminals 3A- 15 and 3A-12	Below 1 Ω
   3E-1 - 3A-32	Battery voltage not applied to terminals 3A- 15 and 3A-12	10 kΩ or higher
   	Battery voltage applied to terminals 3A- 15 and 3A-12	Below 1 Ω

NG → See step   7 

OK: Go to next step 

1. Reconnect the D41 and D48 certification ECU (smart key ECU assembly) connectors.
2. Measure the voltage according to the value(s) in the table below.
   Fig 2: Inspecting Certification ECU (Smart Key ECU Assembly)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *a

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

   -

   -

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   D41-6 (IG1D) - Body ground	Engine switch on (ACC) → Engine switch on (IG)	Below 1 V → 9 V or higher
   D48-9 (IG2D) - Body ground	Engine switch on (ACC) → Engine switch on (IG)	Below 1 V → 9 V or higher

NG → See step   6 

OK → CHECK RELAY CONTACT SIDE CIRCUIT