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

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR IN CIRCUIT CONNECTED TO POWER SOURCE 

OK: Go to next step 

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Reconnect the A23, A24, C21 and C22 power management control ECU connectors.
2. Connect the Techstream to the DLC3.
3. Turn the power switch on (IG).
4. Turn the Techstream on.
5. Enter the following menus: Body Electrical / Power Source Control / Data List.
6. According to the display on the Techstream, read the Data List.
   POWER SOURCE CONTROL
   
   

   Techstream Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Key Certif Wait T-Out	Key verification malfunction / No or Yes	No: Verification normal Yes: Verification error (detected due to the electrical key transmitter sub-assembly ID code and the ID code stored in the certification ECU (smart key ECU assembly) not matching)	When the EV control system cannot be started due to a key verification error, Yes is displayed.

   OK

   When more than 1 second elapses after the power switch is turned from off to on (IG), No is displayed in the Data List.

NG → See step   9 

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
   Start Switch1	Power switch 1 status / OFF or ON	OFF: Power switch not pressed ON: Power switch pressed	If the power switch is pressed for a short time, the display may not change. Use this item to determine whether the power switch input signal is malfunctioning.
   Start Switch2	Power switch 2 status / OFF or ON	OFF: Power switch not pressed ON: Power switch pressed	Backup for power switch 1. However, when the power switch is pressed and held, the control functions only when both power switch 1 and 2 are normal. Behaves the same way as power switch 1.

   OK

   ON (power switch is pushed) and OFF (power switch is not pushed) appear on the screen.

NG → See step   7 

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
   Power Supply Condition	Power supply state / All OFF, ACC ON, IG1 ON, IG2 ON, ST ON	ALL OFF: Power switch off ACC ON: Power switch on (ACC) IG1 ON: Power switch on (IG) (IG1 relay on) IG2 ON: Power switch on (IG) (IG2 relay on) ST ON: Sending EV control system start request signal	Since the IG1 and IG2 relays turn on at approximately the same time, IG1 ON may not be displayed (the IG1 relay turns on for a very short time).

6. Measure the voltage while checking the Data List on the Techstream.
   Fig 1: Measuring Voltage Of Power Management Control ECU Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   C21-15 (IG1D) - Body ground	Power switch off	Below 1 V
   	Power switch on (ACC)	Below 1 V
   	Power switch on (IG)	9 V or higher
   A24-2 (IG2D) - Body ground	Power switch off	Below 1 V
   	Power switch on (ACC)	Below 1 V
   	Power switch on (IG)	9 V or higher
   C21-16 (ACCD) - Body ground	Power switch off	Below 1 V
   	Power switch on (IG)	9 V or higher
   	Power switch on (ACC)	9 V or higher

   TEXT IN ILLUSTRATION
   
   

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

NG → See step   10 

OK: Go to next step 

1. Check that the power source mode becomes on (ACC) and on (IG) when the power switch is operated.

   OK

   Power source mode becomes on (ACC) and on (IG) when the power switch is operated.

NG → CHECK RELAY CONTACT SIDE CIRCUIT 

OK → See step   13 

1. Remove the power switch. Refer to REMOVAL .
2. Inspect the power switch. Refer to INSPECTION .

NG → See step   11 

OK: Go to next step 

1. Disconnect the C22 and C21 power management control ECU connectors.
2. Disconnect the C15 power switch connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   C21-19 (SSW2) - C15-2 (SS2)	Always	Below 1 Ω
   C22-21 (SSW1) - C15-7 (SS1)	Always	Below 1 Ω
   C15-5 (GND) - Body ground	Always	Below 1 Ω
   C21-19 (SSW2) or C15-2 (SS2) - Body ground	Always	10 kΩ or higher
   C22-21 (SSW1) or C15-7 (SS1) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   12 

1. Enter the following menus: Body Electrical / Power Source Control and Smart Key / DTC.
2. Check for DTCs.

   Result

   Result	Proceed to
   The following DTCs are not output: B2785 B2287 B2784	A
   DTC B2785 is not output but DTC B2287 is output.	B
   DTCs other than B2287 are output.	C

B → See step   15 

C → GO TO DIAGNOSTIC TROUBLE CODE CHART 

A → See step   14