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

Toyota Venza Service Manual / Theft Deterrent / Keyless Entry / Smart Key System(for Start Function) / Power Source Mode does not Change to ON (IG and ACC)

DESCRIPTION

When the engine switch is pushed with the electrical key in the cabin, the power management control ECU receives signals to change the power source mode.

HINT:

To allow use of the Techstream to inspect the push-button start function when the power source mode is off, repeat opening and closing any of the doors. Opening and closing a door establishes communication between the Techstream and the power management control ECU. (Opening and closing a door can also be simulated by operating a door courtesy light switch.)

WIRING DIAGRAM

PROCEDURE

CHECK DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the Techstream on.

(c) 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.

(d) Enter the following menus: Body Electrical / All ECUs / Health Check.

(e) Clear the DTC.

(f) Check for DTCs again.

OK:

DTCs are not output.

GO TO DIAGNOSTIC TROUBLE CODE CHART

2.	CHECK SMART KEY SYSTEM

(a) Remove the battery of the electrical key transmitter (See page ).

(b) Touch the logo side mark of the key or card key to the engine switch.

OK:

Power source mode can be changed.

GO TO DIAGNOSIS PROCEDURE (Room Oscillator does not Recognize Key)

3.	CHECK HARNESS AND CONNECTOR (BATTERY - POWER MANAGEMENT CONTROL ECU)

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

4.	CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - BODY GROUND)

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

5.	READ VALUE USING TECHSTREAM

(a) Reconnect the D42 connector to the power management control ECU.

(b) Enter the following menus: Body Electrical / Power Source Control / Data List.

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	-

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.

REPLACE POWER MANAGEMENT CONTROL ECU

6.	INSPECT ENGINE SWITCH

(a) Remove the engine switch (See page ).

(b) 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)

Result	Proceed to
OK	A
NG	B
NG	C

REPLACE ENGINE SWITCH (for 2ZR-FE)

REPLACE ENGINE SWITCH (for 1AR-FE)

7.	CHECK HARNESS AND CONNECTOR (ENGINE SWITCH - POWER MANAGEMENT CONTROL ECU AND BODY GROUND)

(a) Disconnect the D43 connector from power management control ECU.

(b) 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

Front view of wire harness connector

(to Engine Switch)

Front view of wire harness connector

(to Power Management Control ECU)

REPLACE POWER MANAGEMENT CONTROL ECU

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

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