Toyota 4Runner: No Answer-Back

Toyota 4Runner Service Manual / Vehicle Interior / Door Lock / Wireless Door Lock Control System(w/o Smart Key System) / No Answer-Back

DESCRIPTION

In some cases, the 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, hazard warning light and wireless door lock buzzer signal outputs from the main body ECU may be malfunctioning.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Start troubleshooting 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 ignition switch ON.

(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

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
FR Door Lock Pos	Front RH side door lock position switch signal / UNLOCK or LOCK	UNLOCK: Front RH side door unlocked LOCK: Front RH side door locked	-
FL Door Lock Pos	Front LH side door lock position switch signal / UNLOCK or LOCK	UNLOCK: Front LH side door unlocked LOCK: Front LH side door locked	-
RR-Door Lock Pos SW	Rear RH side door lock position switch signal / ON or OFF	ON: Rear RH side door unlocked OFF: Rear RH side door locked	-
RL-Door Lock Pos SW	Rear LH side door lock position switch signal / ON or OFF	ON: Rear LH side door unlocked OFF: Rear LH side door locked	-

OK:

The Techstream should display as shown in the table according to door lock operation.

Result

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

GO TO POWER DOOR LOCK CONTROL SYSTEM (Proceed to Only Passenger Door Lock/Unlock Functions do not Operate)

GO TO POWER DOOR LOCK CONTROL SYSTEM (Proceed to Only Driver Door Lock/Unlock Functions do not Operate)

GO TO POWER DOOR LOCK CONTROL SYSTEM (Proceed to Only Rear Door RH Lock/Unlock Functions do not Operate)

GO TO POWER DOOR LOCK CONTROL SYSTEM (Proceed to Only Rear Door LH Lock/Unlock Functions do not Operate)

2.	CHECK WIRELESS ANSWER-BACK OPERATION

(a) Check the wireless answer-back operation by the wireless door lock control function.

Result

Result	Proceed to
Only hazard warning light answer-back does not occur	A
Only wireless door lock buzzer answer-back does not occur	B

GO TO STEP 6

3.	CHECK HAZARD WARNING LIGHT OPERATION

(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 (HAZARD WARNING LIGHT)

(a) Operate the Techstream according to the steps on the display and select "Active Test" (See page ).

Main Body

Tester Display	Test Part	Control Range	Diagnostic Note
Hazard	Turn signal flasher relay	ON/OFF	-

OK:

The hazard warning lights can be turned on and off using the Techstream.

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

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

(a) Disconnect the F11 flasher connector.

(b) Disconnect the F9 ECU connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
F11-12 (HAZ) - F9-3 (HAZ)	Always	Below 1 Ω
F11-12 (HAZ) - Body ground	Always	10 kΩ or higher

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

(a) Operate the Techstream according to the steps on the display and select "Active Test" (See page ).

Main Body

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

OK:

The wireless door lock buzzer can be turned on and off using the Techstream.

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

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

(a) Disconnect the A5 buzzer connector.

(b) Remove the main body ECU (See page ).

Standard Resistance:

Tester Connection	Condition	Specified Condition
A5-1 - A-21 (BZR)	Always	Below 1 Ω
A5-2 - Body ground	Always	Below 1 Ω
A5-1 - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.	REPLACE WIRELESS DOOR LOCK BUZZER

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

9.	CHECK WIRELESS DOOR LOCK BUZZER OPERATION

(a) Check that the wireless door lock buzzer sounds by operating the wireless door lock function.

OK:

Wireless door lock buzzer sounds.

END (WIRELESS DOOR LOCK BUZZER IS DEFECTIVE)

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

Only Wireless Control Function is Inoperative

DESCRIPTION The door control receiver receives signals from the transmitter and sends these signals to the main body ECU. The main body ECU then controls all the doors by sending lock/unlock sign ...

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