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

1. Open and close the driver door when the power switch is OFF.
2. Check that the engine (hybrid) starts.

   OK

   Engine (hybrid) starts.

   HINT: 

   After the battery runs out, the engine (hybrid) may not start if the steering lock ECU has not been initialized (lock / unlock may not be recorded) through the procedure described above.

OK → END (SYSTEM IS OK) 

NG: Go to next step 

1. Delete the DTCs.

   HINT: 

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

2. Check for DTCs again.
   RESULT
   
   

   Result	Proceed to
   DTC is not output	A
   DTC is output	B

   HINT: 

   "Each system" means the hybrid control system, engine immobilizer system, electrical steering lock, SFI system and smart access system.

B → GO TO DTC CHART (EACH SYSTEM) 

A: Go to next step 

1. Ensure the electrical key is inside the cabin.
2. Check that the power source mode changes as shown below each time the power switch is pushed.

   OK

   OFF → ON (ACC) → ON (IG) → OFF

NG → GO TO POWER SOURCE MODE DOES NOT CHANGE 

OK: Go to next step 

1. Check the DATA LIST for proper functioning of the steering lock condition.
   POWER SOURCE CONTROL ECU
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Code
   Steering Unlock SW	Steering lock condition / ON or OFF	ON: Steering is unlocked OFF: Steering is locked	-

   OK

   ON (steering is unlocked) appears on screen.

NG → GO TO ELECTRIC STEERING LOCK 

OK: Go to next step 

1. Check the DATA LIST for proper functioning of the stop light switch.
   POWER SOURCE CONTROL ECU
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Code
   Stop Light SW	Stop light switch signal / ON or OFF	ON: Brake pedal depressed OFF: Brake pedal released	-

   OK

   ON (brake pedal depressed) appears on screen.

NG → See step   12 

OK: Go to next step 

1. When the power switch is ON (ACC), check that the steering lock can be released.

   OK

   Steering lock can be released.

NG → GO TO ELECTRIC STEERING LOCK 

OK: Go to next step 

1. Measure the output voltage of the power source control ECU.
   Fig 1: Identifying Terminals Of Power Source Control ECU Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard voltage

   Tester Connection	Condition	Specified Condition
   39 (STSW) - Body ground	Power switch pressed with brake pedal depressed → After approx. 1 sec. has passed, release power switch	10 to 14 V → Below 1 V

NG → See step   15 

OK: Go to next step 

1. Check the DATA LIST for proper functioning of the L code check.
   CERTIFICATION ECU
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Code
   L Code Check	L code check / OK or NG	OK: L code certification result is normal NG: L code certification result is abnormal	-

   OK

   OK (L code check result is normal) appears on screen.

NG → See step   16 

OK: Go to next step 

1. Check the DATA LIST for proper functioning of the engine (hybrid) start request.
   CERTIFICATION ECU
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Code
   Start Request	Engine (hybrid) start request signal / YES or NO	YES: Engine (hybrid) start NO: Engine (hybrid) stop	-

   OK

   Start request is OK.

NG → See step   17 

OK: Go to next step 

1. Check the DATA LIST for proper functioning of the S code check.
   CERTIFICATION ECU
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Code
   S Code Check	S code check / OK or NG	OK: S code certification result is normal NG: S code certification result is abnormal	-

   OK

   OK (S code check result is normal) appears on screen.

NG → See step   17 

OK: Go to next step 

1. Temporarily replace the ID code box with a new or normally functioning one.
2. Check that the engine (hybrid) starts normally.

   OK

   Engine (hybrid) starts normally.

NG → GO TO HYBRID CONTROL SYSTEM 

OK → END (ID CODE BOX IS FAULTY) 

1. Remove the STOP SW fuse from main body ECU RH.
2. Measure the resistance of the fuse.

   Standard resistance

   Below 1 Ω

NG → REPLACE FUSE 

OK: Go to next step 

1. Inspect the stop light switch. Refer to INSPECTION .

NG → REPLACE STOP LIGHT SWITCH 

OK: Go to next step 

1. Disconnect the K73 ECU connector.
   Fig 2: Identifying K73 ECU Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the voltage of the wire harness side connector.

   Standard voltage

   Tester Connection	Condition	Specified Condition
   K73-1 (STP) - Body ground	Brake pedal depressed	10 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE POWER SOURCE CONTROL ECU 

1. Disconnect the K73 ECU connector.
   Fig 3: Identifying Power Source Control ECU And HV Control ECU Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the A54 ECU connector.
3. Measure the resistance of the wire harness side connectors.

   Standard resistance

   Tester Connection	Specified Condition
   K73-39 (STSW) - A54-22 (ST2)	Below 1 Ω
   K73-39 (STSW) or A54-22 (ST2) - Body ground	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE POWER SOURCE CONTROL ECU 

1. Temporarily replace the steering lock ECU with a new or normally functioning one.
2. Check that the engine (hybrid) starts normally.

   OK

   Engine (hybrid) starts normally.

NG → REPLACE ID CODE BOX 

OK → END (STEERING LOCK ECU IS FAULTY) 

1. Temporarily replace the certification ECU with a new or normally functioning one.
2. Check that the engine (hybrid) starts normally.

   OK

   Engine (hybrid) starts normally.

NG → REPLACE ID CODE BOX 

OK → END (CERTIFICATION ECU IS FAULTY)