Toyota Sequoia (2005). Manual - part 516

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DIAGNOSTICS

BACK DOOR CONTROL SYSTEM

DI–1859

2053

*1: When the ignition key is not in the key cylinder and the back door is locked, turning and holding the back
door key in the lock position for 1.5 seconds or more activates the back door ECU to operate the power win-
dow motor and close the power window.
Similarly, turning and holding the back door key in the unlock position for 1.5 seconds or more when the back
door is unlocked will open the power window.
2.

ACTIVE TEST

HINT:
Performing the ACTIVE TEST using the hand–held tester allows the relay, VSV, actuator and so on to oper-
ate without parts removal. Performing the ACTIVE TEST as a first step of troubleshooting is one of the meth-
ods to shorten labor time.
It is possible to display the DATA LIST during the ACTIVE TEST.
(a)

Connect the hand–held tester to the DLC3.

(b)

Turn the ignition switch ON.

(c)

According to the display on the tester, perform the ACTIVE TEST.

BACK–DOOR:

Item

Test details

Diagnostic note

P/W UP/DOWN

Operate the back door power window motor UP/

DOWN

During this ACTIVE TEST, jam protection caught

detection can be monitored.

(Refer to the DATA LIST for details)

DOOR LOCK

Operate the door lock motor at rear door LOCK/

UNLOCK

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REAR WIPER

Operate the rear wiper motor ON/OFF

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DI57F–07

I28390

Engine Room J/B

 ECU–B Fuse

Back Door ECU

Back Door Power Window Regulator Assembly

Rear Wiper Motor

Instrument Panel J/B

 ECU–IG Fuse

 AM1 Fuse

 PWR No. 5 Fuse

 Back Door Power Window Motor

 Power Window Pulse Sensor

Back Door Lock Assembly

 Back Door Courtesy Light Switch

 Unlock Detection Switch

 Back Door Lock Motor

(Located inside of the back door trim board)

Luggage Room Light

Back Door Key Lock and 
Unlock Switch

DI–1860

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DIAGNOSTICS

BACK DOOR CONTROL SYSTEM

2054

PARTS LOCATION

DI57I–08

I28430

SIG

6

15

B11

1F

ECU–IG

W–L

B

I18
Ignition SW

2

F10
Fusible Link Block

1

4

Back Door ECU

B–R

B–R

B–R

B–R

J37
J/C

A

A

11

BD2

BF1

5

B–R

BDR

BECU

GND

1C

4

B–Y

AM1

IG1

1L

1

1C

6

1G

1

2

AM1

1

2

PWR No. 5

B

4

8

5

L–W

L–W

L–W

L–W

4

B11

10

BF1

BD1

3

2D

1

2C

8

1J

3

1E

2

W–R

ECU–B

SHORT PIN

W–R

3A

1

3C

2

W–R

10

BD2

BF1

1

5

B11

3

B11

W–R

W–R

W–R

W–B

W–B

W–B

W–B

J19
J/C

BD1

2

12

BF1

J22
J/C

B

B

BJ

Battery

ALT

A

Engine Room J/B

Instrument Panel J/B

Sub J/B No. 3

Instrument Panel J/B

W

W–R

11

IN1

2

IC4

12

IN1

B–R

3C

3A

8

8

Sub J/B No. 3

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DIAGNOSTICS

BACK DOOR CONTROL SYSTEM

DI–1861

2055

CIRCUIT INSPECTION

Power source circuit

CIRCUIT DESCRIPTION

This circuit provides power to operate the back door ECU.

WIRING DIAGRAM

DI–1862

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DIAGNOSTICS

BACK DOOR CONTROL SYSTEM

2056

INSPECTION PROCEDURE

1

Check PWR No. 5, ECU–B, AM1 and ECU–IG fuse.

CHECK:
Check continuity of the PWR No. 5, ECU–B, AM1 and ECU–IG fuse.
OK:

Continuity

NG

Replace the faulty fuse.

OK

2

Check voltage between terminals, SIG, BDR, BECU and GND of back door ECU
connector.

PREPARATION:
(a)

Turn the ignition switch ON.

(b)

Disconnect the back door ECU connector.

CHECK:
Measure the voltage between terminals SIG, and GND of the back door ECU of the wire harness connector.
OK:

Voltage: 10 to 14V

PREPARATION:
Turn the ignition switch OFF.
CHECK:
Measure the voltage between terminals BDR, BECU and GND of the back door ECU of the wire harness
connector.
OK:

Voltage: 10 to 14V

OK

Proceed to next circuit inspection shown in
problem symptoms table (See page 

DI–1854

).

NG