Toyota Sequoia (2005). Manual - part 485

–

DIAGNOSTICS

BODY CONTROL SYSTEM

DI–1735

1929

INSPECTION PROCEDURE

HINT:
When using the hand–held tester, start the inspection from step 1 and when not using the hand–held tester,
start from step 2.

1

Check theft deterrent horn using hand–held tester.

PREPARATION:
(a)

Connect the hand–held tester to the DLC3.

(b)

Turn the ignition switch ON.

CHECK:
According to the display on the tester, perform the ”ACTIVE TEST”.
BODY ECU:

Item

Test Details

Diagnostic Note

SECURITY HORN

Turn theft horn ON/OFF

This test is available only for vehicles equipped

with security horn.

OK:

The theft deterrent horn sounds or stops correctly when operating it through the hand–held tes-
ter.

OK

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

DI–1686

).

NG

2

Check theft deterrent horn (See page 

BE–92

).

NG

Replace theft deterrent horn.

OK

DI–1736

–

DIAGNOSTICS

BODY CONTROL SYSTEM

1930

3

Check wire harness and connector between theft deterrent horn and body ECU,
theft deterrent horn and body ground (See page 

IN–35

).

NG

Repair or replace wire harness or connector.

OK

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

DI–1686

).

I24356

3

2

1J

1E

W–R

Body ECU

RDA

ECU–B

4

5

2D

5

4

B5

PRG

B

O

W–R

B5

5

IG

1

Battery

SHORT PIN

Engine Room J/B

1

2C

8

Sub J/B No. 3

3A

2

3A

1

RDA

PRG

W2
Wireless Door
Control Receiver

+B

E

V

R–G

3

2

W–R

Instrument Panel J/B

F10
Fusible
Link
Block

B

W–R

A

J43
J/C

O

A

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DIAGNOSTICS

BODY CONTROL SYSTEM

DI–1737

1931

Wireless door lock receiver circuit

CIRCUIT DESCRIPTION

The signal from the transmitter is sent to the body ECU through RDA line of the wireless door control receiver.
RDA line is diagnosed by the body ECU, check DTC also in case of the failure of the wireless function.

WIRING DIAGRAM

DI6LV–13

DI–1738

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DIAGNOSTICS

BODY CONTROL SYSTEM

1932

INSPECTION PROCEDURE

1

Check that DTC B1242 is not indicated (See page 

DI–1829

).

OK:

DTC B1242 is not indicated.

NG

Go to multiplex communication system 
(See page 

DI–1892

).

OK

2

Check wire harness and connector (PRG circuit).

PREPARATION:
Disconnect the connectors of the wireless door lock receiver and body ECU.
CHECK:
Check continuity between terminal W2–3 (PRG) of the wireless door lock receiver and terminal B5–5 (PRG)
of the body ECU.
OK:

Continuity

NG

Repair or replace wire harness or connector.

OK

3

Check voltage between terminals +B and E of wireless door lock receiver.

CHECK:
Measure the voltage between terminals W2–5 (+B) and W2–1 (E) of the wireless door lock receiver.
OK:

Voltage: 10 to 14 V

NG

Repair or replace harness or connector.

OK