Toyota 4Runner manuals

Toyota 4Runner: Only Back Door cannot be Opened

DESCRIPTION

When the back door is unlock and the multiplex network door ECU (back door P/W) receives the ON signal from the back door opener switch, it sends the signal to the main body ECU (multiplex network body ECU) which then activates the back door lock motor.

WIRING DIAGRAM


CAUTION / NOTICE / HINT

HINT:

Since the power door lock control system has functions that use LIN communication, first confirm that there is no malfunction in the communication system by inspecting the LIN communication functions in accordance with the "How to Proceed with Troubleshooting" procedures. Then, conduct the following inspection procedure.

PROCEDURE

1.

READ VALUE USING TECHSTREAM (BACK DOOR OPENER SWITCH ASSEMBLY)

(a) Use the Data List to check if the back door opener switch is functioning properly (See page ).


Back Door P/W

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Back Door Handle Switch

Back door opener switch signal / ON or OFF

ON: Back door opener switch pushed

OFF: Back door opener switch not pushed

-

OK:

On tester screen, item changes between ON and OFF according to above chart.


NG

GO TO STEP 6


OK

2.

PERFORM ACTIVE TEST USING TECHSTREAM (BACK DOOR LOCK ASSEMBLY)

(a) Select the Active Test and check that the back door lock operates (See page ).


Main Body

Tester Display

Test Part

Control Range

Diagnostic Note

Trunk and Back-Door Open

Operate back door lock motor

ON/OFF

-

OK:

The back door lock motor operates normally.


NG

GO TO STEP 4


OK

3.

CHECK MULTIPLEX NETWORK DOOR ECU (BACK DOOR P/W)

(a) Measure the voltage according to the value(s) in the table below.


Standard Voltage:

Tester Connection

Tool Setting

Switch Condition

Specified Condition

W10-24 (HSW+) - W10-7 (HSW-)

5 V/DIV., 10 ms/DIV.

Back door opener switch off

Pulse generation (See waveform 1 or 2)


OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)


NG

REPLACE MULTIPLEX NETWORK DOOR ECU (BACK DOOR P/W)

4.

INSPECT BACK DOOR LOCK ASSEMBLY

(a) Set the back door lock to the full-latch position.


(b) Apply battery voltage to the door lock motor connector and check the operation of the door lock motor.

OK:

Measurement Condition

Specified Condition

Battery positive (+) → 1 (ACT+)

Battery negative (-) → 4 (ACT-)

Moves to open-latch position

Text in Illustration

Full-latch

Open-latch


NG

REPLACE BACK DOOR LOCK ASSEMBLY


OK

5.

CHECK HARNESS AND CONNECTOR (BACK DOOR LOCK ASSEMBLY - MAIN BODY ECU AND BODY GROUND)

(a) Disconnect the W8 back door lock connector.

(b) Disconnect the 2F main body ECU connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

W8-1 (ACT+) - 2F-9 (TR+)

Always

Below 1 Ω

W8-4 (ACT-) - Body ground

Always

Below 1 Ω

W8-1 (ACT+) - Body ground

Always

10 kΩ or higher


OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.

INSPECT BACK DOOR OPENER SWITCH ASSEMBLY

(a) Remove the back door opener switch (See page ).



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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

1 (UL) - 2 (E)

Free

10 kΩ or higher

Pushed

Below 1 Ω


NG

REPLACE BACK DOOR OPENER SWITCH ASSEMBLY


OK

7.

CHECK HARNESS AND CONNECTOR (BACK DOOR OPENER SWITCH ASSEMBLY - MULTIPLEX NETWORK DOOR ECU)

(a) Disconnect the back door opener switch connector.

(b) Disconnect the W10 multiplex network door ECU connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

W10-24 (HSW+) - W3-1 (UL)

Always

Below 1 Ω

W10-7 (HSW-) - W3-2 (E)

Always

Below 1 Ω


OK

REPLACE MULTIPLEX NETWORK DOOR ECU (BACK DOOR P/W)


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

Data List / Active Test
DATA LIST / ACTIVE TEST 1. DATA LIST HINT: Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any p ...

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