Power Source Mode does not Change: Procedure

1. Clear the DTCs. Refer to DTC CHECK/CLEAR .

   HINT: 

   After all DTCs are cleared, check if the trouble occurs again 5 seconds after the engine switch is turned on (IG).

2. Check for DTCs again.

   OK

   No DTC is output.

NG → See step   11 

OK: Go to next step 

1. Ensure the key is inside the cabin.
2. Check that the engine switch indicator illuminates in green when the shift lever is in P or N and the brake pedal is depressed.

   OK

   Engine switch indicator illuminates in green.

NG → See step   13 

OK: Go to next step 

1. Use the Data List to check if the relay monitor is functioning properly.
   MAIN BODY
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   IG1 Relay Monitor (Outside)	D-IG1 outer relay monitor/ON or OFF	ON: Engine switch on (IG) OFF: Engine switch off	-
   IG2 Relay Monitor (Outside)	IG2 outer relay monitor/ON or OFF	ON: Engine switch on (IG) OFF: Engine switch off	-
   IG1 Relay Monitor(Inside)	D-IG1 inner relay monitor/ON or OFF	ON: Engine switch on (IG) OFF: Engine switch off	-
   IG2 Relay Monitor(Inside)	IG2 inner relay monitor/ON or OFF	ON: Engine switch on (IG) OFF: Engine switch off	-
   ACC Relay Monitor	D-ACC relay monitor/ON or OFF	ON: Engine switch on (ACC) OFF: Engine switch off	-

   OK

   ON is displayed on the Techstream screen.

NG → See step   7 

OK: Go to next step 

Fig 1: Identifying L13, DF And DA Main Body ECU Harness Connectors

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the L13, DF and DA main body ECU connectors.
2. Measure the resistance and voltage according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   L13-3 (IG1D) - DA-32	Always	Below 1 Ω
   L13-3 (IG1D) or DA-32 - Body ground	Always	10 kΩ or higher
   L13-22 (ACCD) - DA-19	Always	Below 1 Ω
   L13-22 (ACCD) or DA-19 - Body ground	Always	10 kΩ or higher
   DA-40 - Body ground	Always	Below 1 Ω

   Standard voltage

   Tester Connection	Condition	Specified Condition
   DF-1 - Body ground	Always	11 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Remove the IG2 relay from the engine room No. 2 junction block.
   Fig 2: Inspecting Starter Relay

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   3 - 5	When battery voltage is not applied to terminals 1 and 2	10 kΩ or higher
   3 - 5	When battery voltage is applied to terminals 1 and 2	Below 1 Ω

NG → REPLACE IGNITION RELAY NO. 2 (IG2) 

OK: Go to next step 

Fig 3: Checking Harness And Connector (No. 2 Relay Block -- Main Body ECU And Steering Lock ECU)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Remove the IG2 relay from the engine room No. 2 junction block.
2. Disconnect the L12 main body ECU connector.
3. Disconnect the L33 steering lock ECU connector.
4. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   L12-11 (IG2D) - Relay block IG2 relay terminal 1	Always	Below 1 Ω
   L12-11 (IG2D) or Relay block IG2 relay terminal 1 - Body ground	Always	10 kΩ or higher
   Relay block IG2 relay terminal 2 - Body ground	Always	Below 1 Ω
   L33-6 (IG2) - Relay block IG2 relay terminal 3	Always	Below 1 Ω
   L33-6 (IG2) or Relay block IG2 relay terminal 3 - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE MAIN BODY ECU 

1. Remove the engine switch. Refer to REMOVAL .
   Fig 4: Identifying Connector Terminals Of Engine Switch

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Switch Condition	Specified Condition
   7 (SS1) - 5 (GND)	Pushed	Below 1 Ω
   2 (SS2) - 5 (GND)	Pushed	Below 1 Ω
   7 (SS1) - 5 (GND)	Not pushed	10 kΩ or higher
   2 (SS2) - 5 (GND)	Not pushed	10 kΩ or higher

NG → See step   12 

OK: Go to next step 

Fig 5: Identifying Connector Terminals Of L36 Engine Switch And L13 Main Body ECU

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the L13 main body ECU connector.
2. Disconnect the L36 engine switch connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   L36-7 (SS1) - L13-17 (SSW1)	Always	Below 1 Ω
   L36-2 (SS2) - L13-16 (SSW2)	Always	Below 1 Ω
   L36-5 (GND) - Body ground	Always	Below 1 Ω
   L36-7 (SS1) or L13-17 (SSW1) - Body ground	Always	10 kΩ or higher
   L36-2 (SS2) or L13-16 (SSW2) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Remove the AM2 fuse from the passenger side junction block.
2. Check the resistance of the fuse.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   AM2 fuse	Always	Below 1 Ω

NG → REPLACE FUSE (AM2) 

OK: Go to next step 

Fig 6: Identifying L13, L12 And DA Main Body ECU Harness Connectors

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the L13, L12 and DA main body ECU connectors.
2. Measure the voltage and resistance according to the value(s) in the table below.

   Standard voltage

   Tester Connection	Condition	Specified Condition
   L13-6 (AM1) - Body ground	Always	11 to 14 V
   L12-1 (AM2) - Body ground	Always	11 to 14 V

   Standard resistance

   Tester Connection	Condition	Specified Condition
   DA-40 - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE MAIN BODY ECU