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

1. Connect the Techstream to the DLC3.
2. Turn the Techstream on.
3. Turn on and off any of the door courtesy light switches repeatedly at 1.5 second intervals or less until communication between the Techstream and vehicle starts.
4. Enter the following menus: Body Electrical / All ECUs / Health Check.
5. Clear the DTC.
6. Check for DTCs again.

   OK

   DTCs are not output.

NG → GO TO DIAGNOSTIC TROUBLE CODE CHART 

OK: Go to next step 

1. Remove the battery of the electrical key transmitter. Refer to REPLACEMENT .
   Fig 1: Holding Key Close To Engine Switch

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Touch the logo side mark of the key or card key to the engine switch.
3. Check that the engine switch can be turned on (IG).

   OK

   Power source mode can be changed.

NG → See step   8 

OK: Go to next step 

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - POWER MANAGEMENT CONTROL ECU) 

OK: Go to next step 

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER MANAGEMENT CONTROL ECU - BODY GROUND) 

OK: Go to next step 

1. Reconnect the D42 connector to the power management control ECU.
2. Enter the following menus: Body Electrical / Power Source Control / Data List.
3. Read the Data List according to the display on the Techstream.
   POWER SOURCE CONTROL
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Start Switch1	Start switch 1/ON or OFF	ON: Engine switch pushed OFF: Engine switch not pushed	-
   Start Switch2	Start switch 2/ON or OFF	ON: Engine switch pushed OFF: Engine switch not pushed	-

   OK

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

NG → See step   6 

OK → See step   9 

1. Remove the engine switch. Refer to REMOVAL .
   Fig 2: Inspecting Engine Switch Connector Terminals

   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
   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

   TEXT IN ILLUSTRATION
   
   

   *1	Component without harness connected (Engine Switch)

3. Proceed to next step based on the inspection result.

   Result	Proceed to
   OK	A
   NG	B
   NG	C

B → See step   10 

C → See step   11 

A: Go to next step 

1. Disconnect the D43 connector from power management control ECU.
   Fig 3: Checking Engine Switch & Power Management Control ECU Connector Terminals

   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
   D13-7 (SS1) - D43-18 (SSW1)	Always	Below 1 Ω
   D13-7 (SS1) - Body ground	Always	10 kΩ or higher
   D13-2 (SS2) - D43-17 (SSW2)	Always	Below 1 Ω
   D13-2 (SS2) - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1

   Front view of wire harness connector (to Engine Switch)

   *2

   Front view of wire harness connector (to Power Management Control ECU)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE SWITCH - POWER MANAGEMENT CONTROL ECU OR BODY GROUND) 

OK → See step   12