Toyota Venza: No Answer-Back

Toyota Venza Service Manual / Door Lock / Wireless Door Lock Control System(w/ Smart Key System) / No Answer-Back

DESCRIPTION

In some cases, wireless door lock control functions are normal but the hazard warning light and/or wireless door lock buzzer answer-back function(s) does not operate. In such cases, the main body ECU (driver side junction block assembly) hazard warning light and wireless door lock buzzer signal outputs may be malfunctioning.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Troubleshooting should be started after confirming that the customize status of the answer-back function has been switched on.

PROCEDURE

1.	READ VALUE USING TECHSTREAM (DOOR LOCK POSITION SWITCH)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Main Body / Data List.

(e) Read the Data List according to the display on the Techstream.

Main Body (Main Body ECU (Driver Side junction Block Assembly))

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
D-Door Lock Pos SW	Driver door lock position switch signal/LOCK or UNLOCK	ON: Driver side door is unlocked OFF: Driver side door is locked	-
P-Door Lock Pos SW	Front passenger side door lock position switch signal/ON or OFF	ON: Front passenger side door is unlocked OFF: Front passenger side door is locked	-
RR-Door Lock Pos SW	Rear right side door lock position switch signal/ON or OFF	ON: Rear right side door unlocked OFF: Rear right side door locked	-
RL-Door Lock Pos SW	Rear left side door lock position switch signal/ON or OFF	ON: Rear left side door unlocked OFF: Rear left side door locked	-

OK:

On the Techstream screen, the display changes between ON and OFF as shown in the chart above.

Result	Proceed to
OK	A
NG (for Driver Side)	B
NG (for Front Passenger Side)	C
NG (for Rear LH Side)	D
NG (for Rear RH Side)	E

GO TO LIGHTING SYSTEM (Proceed to Door Unlock Detection Switch Circuit)

2.	CHECK WIRELESS DOOR LOCK CONTROL FUNCTION

(a) Check the wireless door lock control functions by operating the transmitter switches.

Result	Proceed to
Wireless door lock functions are normal but hazard warning light answer-back does not occur.	A
Wireless door lock functions are normal but wireless door lock buzzer answer-back does not occur.	B
Doors cannot be locked or unlocked with transmitter.	C

GO TO STEP 6

GO TO PROBLEM SYMPTOMS TABLE

3.	CHECK HAZARD WARNING LIGHT

(a) Check that the hazard warning lights flash continuously when the hazard warning signal switch is pressed.

OK:

Hazard warning lights flash continuously.

GO TO LIGHTING SYSTEM

4.	PERFORM ACTIVE TEST USING TECHSTREAM (TURN SIGNAL FLASHER)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Perform the Active Test according to the display on the Techstream.

Main Body (Main Body ECU (Driver Side Junction Block Assembly))

Tester Display	Test Part	Control Range	Diagnostic Note
Hazard	Turn Signal Flasher	ON/OFF	-

OK:

Hazard warning lights turn on/off.

REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)

5.	CHECK HARNESS AND CONNECTOR (TURN SIGNAL FLASHER - MAIN BODY ECU)

(a) Disconnect the D34 turn signal flasher connector.

(b) Disconnect the D48 main body ECU connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
D34-8 (HAZ) - D48-4 (HAZ)	Always	Below 1 Ω
D34-8 (HAZ) - Body ground	Always	10 kΩ or higher

Text in Illustration

Front view of wire harness connector

(to Turn Signal Flasher)

Front view of wire harness connector

(to Main Body ECU (Driver Side Junction Block Assembly))

REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.	PERFORM ACTIVE TEST USING TECHSTREAM (WIRELESS DOOR LOCK BUZZER)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Perform the Active Test according to the display on the Techstream.

Main Body (Main Body ECU (Driver Side Junction Block Assembly))

Tester Display	Test Part	Control Range	Diagnostic Note
Wireless Buzzer	Turns the wireless door lock buzzer	ON/OFF	-

OK:

Wireless buzzer turns on/off.

REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)

7.	CHECK HARNESS AND CONNECTOR (WIRELESS DOOR LOCK BUZZER - MAIN BODY ECU)

(a) Disconnect the D51 main body ECU connector.

(b) Disconnect the A28 buzzer connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
D51-7 (BZR) - A28-1	Always	Below 1 Ω
A28-2 - Body ground	Always	Below 1 Ω
A28-1 - Body ground	Always	10 kΩ or higher

Text in Illustration

Front view of wire harness connector

(to Main Body ECU (Driver Side Junction Block Assembly))

Front view of wire harness connector

(to Wireless Door Lock Buzzer)

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.	REPLACE WIRELESS DOOR LOCK BUZZER

(a) Temporarily replace the wireless door lock buzzer with a new one (See page ).

9.	CHECK WIRELESS DOOR LOCK BUZZER OPERATION

(a) Check the operation of the wireless answer-back function.

OK:

Wireless answer-back function operates normally.

END (WIRELESS DOOR LOCK BUZZER WAS DEFECTIVE)

REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)

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