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

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

   OK

   No DTCs are output.

   NOTE:

   • When using the Techstream with the engine switch off, perform either of the following: 1) Turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and vehicle begins, or 2) connect the Techstream to the vehicle, select the vehicle type under manual mode, and then enter the following menus: Body Electrical / Smart Key / Trouble Codes.
   • Make sure that no DTCs are output. If any DTCs are output, proceed to the Diagnostic Trouble Code Chart.

NG → See step   17 

OK: Go to next step 

1. Check that the wireless lock and unlock functions operate normally.

   OK

   Wireless lock and unlock functions operate normally.

   HINT: 

   If the wireless lock and unlock functions operate normally, it can be determined that some functions of the key and certification ECU operate normally.

NG → See step   11 

OK: Go to next step 

1. Remove the battery of the electrical key transmitter.
   Fig 1: Checking Smart Key System (For Start Function)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. With the brake pedal depressed, touch the key to the engine switch.
3. Depress and hold the engine switch for a maximum of 15 seconds and check if the engine can be started.

   OK

   The engine can be started.

   HINT: 

   • If the engine can be started, it is clear that the key is not being detected properly inside the vehicle. There may be a problem with the formation of the interior detection area, a problem with the indoor electrical key antenna (reception problem), or wave interference.
   • If the engine cannot be started, there is a problem with the engine switch, power management control ECU or a related wire harness.

NG → See step   4 

OK → See step   12 

1. Connect the Techstream to the DLC3.
2. Turn the Techstream on.
   NOTE:

   When using the Techstream with the engine switch off, perform the following: Turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and vehicle begins.

3. Enter the following menus: Body Electrical / Power Source Control / Data List.
4. According to the display on the Techstream, read the Data List.
   POWER SOURCE CONTROL
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Start Switch1	Condition of engine switch contact 1/ON or OFF	ON: Engine switch pressed OFF: Engine switch not pressed	If the engine switch is pressed for a short time, the display may not change. Use this item to determine whether the engine switch input signal is malfunctioning.
   Start Switch2	Condition of engine switch contact 2/ON or OFF	ON: Engine switch pressed OFF: Engine switch not pressed	This is the backup for engine switch 1. Behaves the same way as engine switch 1.

   OK

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

NG → See step   9 

OK: Go to next step 

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. Connect the Techstream to the DLC3.
2. Turn the Techstream on.
   NOTE:

   When using the Techstream with the engine switch off, perform the following: Turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and vehicle begins.

3. Enter the following menus: Body Electrical / Power Source Control / Data List.
4. Read the Data List and check that the display changes according to the changes in the power source mode when the engine switch is pushed.
   POWER SOURCE CONTROL
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Power Supply Condition	State of power supply/IG2 ON, ST ON, All OFF, IG1 ON or ACC ON	All OFF: Engine switch off (power supply off) ACC ON: Engine switch on (ACC) (ACC relay on) IG1 ON: Engine switch on (IG) (IG1 relay on) IG2 ON: Engine switch on (IG) (IG2 relay on) ST ON: Cranking engine (ST request signal on)	Since IG1 ON and IG2 ON turn "ON" at approximately the same time, IG2 ON may not be displayed.

   OK

   Display changes according to the changes in the power source mode when the engine switch is pushed.

5. Measure the voltage according to the value(s) in the table below.
   Fig 2: Inspecting A35 & D89 Power Management Control ECU Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *a

   Component with harness connected (Power Management Control ECU)

   -

   -

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   D89-20 (IG1D) - Body ground	Engine switch off	1 V or less
   	Engine switch on (ACC)*1
   	Engine switch on (IG)*2	9 V or higher
   A35-8 (IG2D) - Body ground	Engine switch off	1 V or less
   	Engine switch on (ACC)*1
   	Engine switch on (IG)*2	9 V or higher
   D89-19 (ACCD) - Body ground	Engine switch off	1 V or less
   	Engine switch on (ACC)*1	8.5 V or higher
   	Engine switch on (IG)*2	8.5 V or higher

   HINT: 

   • *1: To turn the engine switch on (ACC), carry the key and press the engine switch with the shift lever in P and the brake pedal released.
   • *2: To turn the engine switch on (IG), carry the key and press the engine switch twice with the shift lever in P and the brake pedal released.

NG → See step   13 

OK: Go to next step 

1. Check that the power source mode changes to on (ACC) and on (IG) when operating the engine switch.

   OK

   The power source mode changes to on (ACC) and on (IG) in response to the operation of the engine switch.

NG → CHECK RELAY CONTACT CIRCUIT 

OK → See step   14 

1. Remove the engine switch.
   Fig 3: Identifying 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	Switch Condition	Specified Condition
   7 (SS1) - 5 (GND)	Engine switch not pushed	10 kΩ or higher
   	Engine switch pushed	Below 1 Ω
   2 (SS2) - 5 (GND)	Engine switch not pushed	10 kΩ or higher
   	Engine switch pushed	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *a	Component without harness connected (Engine Switch)

NG → See step   15 

OK: Go to next step 

1. Disconnect the D89 power management control ECU connector.
2. Disconnect the D33 engine switch connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D89-17 (SSW2) - D33-2 (SS2)	Always	Below 1 Ω
   D89-18 (SSW1) - D33-7 (SS1)
   D89-17 (SSW2) - Body ground	Always	10 kΩ or higher
   D89-18 (SSW1) - Body ground
   D33-5 (GND) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   16