Toyota 4Runner manuals

Toyota 4Runner: 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.

(c) Turn the Techstream 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


B

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


C

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


D

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


E

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


A

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


B

GO TO STEP 6


A

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.


NG

GO TO LIGHTING SYSTEM


OK

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.


OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)


NG

5.

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

(a) Disconnect the F11 flasher connector.

(b) Disconnect the F9 ECU connector.

(c) Measure the resistance according to the value(s) in the table below.

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


OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)


NG

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.


OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)


NG

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 ).


(c) Measure the resistance according to the value(s) in the table below.

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


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

8.

REPLACE WIRELESS DOOR LOCK BUZZER

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



NEXT

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.


OK

END (WIRELESS DOOR LOCK BUZZER IS DEFECTIVE)


NG

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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