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

1. Place the electrical key transmitter sub-assembly on the driver seat.
2. Depress the brake pedal.
3. Check that the power switch indicator light is green, and then press the power switch and check that the EV control system turns on (READY).

   OK

   Power source mode becomes on (READY).

NG → See step   2 

OK → END (EV CONTROL SYSTEM PERMISSION CONDITIONS WERE NOT SATISFIED) 

1. Measure the auxiliary battery voltage with the power switch off.

   Standard voltage

   11 to 14 V

   HINT: 

   • It may be possible to tell whether the auxiliary battery is discharged by operating the horn.
   • If the auxiliary battery voltage is less than 11 V, charge or replace it.

NEXT: Go to next step 

1. Using the Techstream, confirm the output of DTCs for all systems.

   OK

   No DTCs are output.

   NOTE:

   Make sure that no DTCs are output. If any DTCs are output, proceed to the Diagnostic Trouble Code Chart.

NG → GO TO DTC CHART 

OK: Go to next step 

1. If the problem occurs in certain locations or times of day, the possibility of wave interference is high.

   HINT: 

   Whether or not the problem is due to wave interference can be checked by holding the electrical key transmitter sub-assembly near the door control receiver (RF band).

NEXT: Go to next step 

1. Get into the vehicle while carrying an electrical key transmitter sub-assembly.
2. Move the shift lever to P.
3. With the brake pedal released, check that pressing the power switch causes the power source mode to change.
   RESULT
   
   

   Result	Proceed to
   Off → on (ACC) → on (IG) → off	A
   Power source mode does not change to on (ACC) and on (IG)	B
   Power source mode changes to on (IG) but not to on (ACC)	C
   Power source mode changes to on (ACC) but not to on (IG)	D

B → See step   21 

C → See step   22 

D → See step   23 

A: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Power Source Control / Data List.
5. According to the display on the Techstream, read the Data List.
   POWER SOURCE CONTROL
   
   

   Techstream Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Steering Unlock Switch	State of steering unlock sensor signal output from steering lock ECU (steering lock actuator assembly) / OFF or ON	OFF: Steering locked ON: Steering unlocked	When the shift lever is in P and the power switch is off, if any door is opened or closed, the steering is locked. When the electrical key transmitter sub-assembly is inside the vehicle and the power switch is turned on (ACC) or on (IG), the steering unlocks. The EV control system cannot be started when the steering unlock signal is off.

   OK

   The item in the Data List indicates "ON" (the steering is unlocked).

NG → See step   19 

OK: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Power Source Control / Data List.
5. According to the display on the Techstream, read the Data List.
   POWER SOURCE CONTROL
   
   

   Techstream Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Stop Light Switch1	State of brake pedal / OFF or ON	OFF: Brake pedal released ON: Brake pedal depressed	Use this item to determine whether the stop light switch assembly is malfunctioning. The EV control system cannot be started when this item is OFF. When this item is malfunctioning, the EV control system can be started by pressing and holding the power switch for a certain period of time.

   OK

   The item in the Data List changes when the brake pedal is depressed and released.

NG → See step   12 

OK: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Smart key / Data List.
5. According to the display on the Techstream, read the Data List.
   SMART KEY
   
   

   Techstream Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   L Code Check	Verification result between certification ECU (smart key ECU assembly) and steering lock ECU (steering lock actuator assembly) / OK or NG	OK: Verification result normal NG: Verification result abnormal	When NG is displayed: L code has not been registered for the certification ECU (smart key ECU assembly) or steering lock ECU (steering lock actuator assembly). Steering cannot be locked. Steering cannot be unlocked (the EV control system cannot be started).

   OK

   The Data List item changes to "OK" when the electrical key transmitter sub-assembly is inside the vehicle.

   HINT: 

   Reasons for verification failure:

   • The steering lock ECU (steering lock actuator assembly) is malfunctioning.
   • There is a problem with the communication between ECUs.
   • An ECU is replaced, but is not registered.
   • An ECU is replaced with an ECU which has a code already stored in it.

NG → See step   14 

OK: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Smart key/ Data List.
5. According to the display on the Techstream, read the Data List.
   SMART KEY
   
   

   Techstream Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   System Start Condition	Status of EV control system start permission signal determined by steering lock ECU (steering lock actuator assembly) and sent to certification ECU (smart key ECU assembly) / NG or OK	NG: EV control system start prohibited OK: EV control system start permitted	When Permitted is displayed, the certification ECU (smart key ECU assembly) receives an unlock confirmation signal from the steering lock ECU (steering lock actuator assembly) and starting of the EV control system possible. The EV control system cannot be started when Prohibited is displayed.

   NOTE:

   Make sure that the power switch indicator is illuminated in green before pressing the power switch.

   OK

   The display changes in response to the operation of the power switch.

NG → See step   24 

OK: Go to next step 

1. Measure the voltage according to the value(s) in the table below.
   Fig 1: Measuring Voltage Of Power Management Control ECU Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (Power Management Control ECU)

   1. Waveform 1
      Fig 2: Identifying Waveform 1

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION
      
      

      *a

      Approximately 160 ms

      *b

      Approximately 510 ms

      MEASUREMENT CONDITION
      
      

      Item	Content
      Tester Connection	C21-21 (IMO) - C21-24 (E1)
      Tool Setting	2 V/DIV., 200 ms./DIV.
      Condition	Within 3 seconds of EV control system start or within 3 seconds of power switch turned on (IG) after auxiliary battery cable disconnected and reconnected

   2. Waveform 2
      Fig 3: Identifying Waveform 2

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION
      
      

      *a

      Approximately 160 ms

      *b

      Approximately 510 ms

      MEASUREMENT CONDITION
      
      

      Item	Content
      Tester Connection	C21-20(IMI) - C21-24 (E1)
      Tool Setting	2 V/DIV., 200 ms./DIV.
      Condition	Within 3 seconds of EV control system start or within 3 seconds of power switch turned on (IG) after auxiliary battery cable disconnected and reconnected

      OK

      The waveform is displayed as shown in illustration.

NG → See step   16 

OK: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Power Source Control / Data List.
5. According to the display on the Techstream, read the Data List.
   POWER SOURCE CONTROL
   
   

   Techstream Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Starter Request Signal	EV control system start request signal status / OFF or ON	OFF: After approx. 1 sec. has elapsed, the power switch is released ON: With the shift lever in P and brake pedal depressed, the power switch is pressed and held	When the EV control system cannot be started due to a start request signal malfunction, OFF is displayed. When the power switch is pressed, the duration of time that ON is displayed will be extremely short. As such, the power switch needs to be pressed and held for a certain amount of time.

   NOTE:

   Make sure that the power switch indicator is illuminated in green before pressing the power switch.

   OK

   The display changes in response to the operation of the power switch.

NG → See step   26 

OK → See step   25 

1. Disconnect the A22 power management control ECU connector.
2. Disconnect the A34 stop light switch assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A22-10 (STP) - A34-1 (L)	Always	Below 1 Ω
   A22-10 (STP) or A34-1 (L) - Body ground	Always	10 kΩ or higher

4. Reconnect the A22 power management control ECU connector.
5. Measure the voltage according to the value(s) in the table below.
   Fig 4: Measuring Voltage Of Stop Light Switch Assembly Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   A34-2 (B) - Body ground	Power switch off	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Stop Light Switch Assembly)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

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

NG → See step   20 

OK → See step   28 

1. Replace the steering lock ECU (steering lock actuator assembly) with a new one. Refer to DISASSEMBLY .
2. Perform the registration procedures. Refer to REGISTRATION .

NEXT: Go to next step 

1. Place the electrical key transmitter sub-assembly on the driver seat.
2. Depress the brake pedal.
3. Check that the power switch indicator light is green, and then press the power switch and check that the EV control system turns on (READY).

   OK

   Power source mode becomes on (READY).

NG → See step   27 

OK → END (STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY) WAS DEFECTIVE) 

1. Disconnect the C21 power management control ECU connector.
2. Disconnect the C19 certification ECU (smart key ECU assembly) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   C21-21 (IMO) - C19-34 (EFII)	Always	Below 1 Ω
   C21-20 (IMI) - C19-35 (EFIO)	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Replace the power management control ECU with a new one. Refer to REMOVAL .

NEXT: Go to next step 

1. Place the electrical key transmitter sub-assembly on the driver seat.
2. Depress the brake pedal.
3. Check that the power switch indicator light is green, and then press the power switch and check that the EV control system turns on (READY).

   OK

   Power source mode becomes on (READY).

NG → See step   27 

OK → END (POWER MANAGEMENT CONTROL ECU WAS DEFECTIVE)