Toyota Sequoia (2005). Manual - part 358

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–1227

1421

DTC

B1660/43 Passenger Airbag ON/OFF Indicator 

Malfunction

CIRCUIT DESCRIPTION

The passenger airbag ON/OFF indicator circuit consists of the airbag sensor assembly and the integration
control and panel.
This circuit indicates the operation condition of the front passenger airbag assembly, the side airbag assem-
bly RH and seat belt pretensioner RH.
DTC B1660/43 is recorded when a malfunction is detected in the passenger airbag ON/OFF indicator circuit.

DTC No.

DTC Detecting Condition

Trouble Area

B1660/43

The airbag sensor assembly receives a line short circuit

signal, an open circuit signal, a short circuit to ground sig-

nal or a short

 

circuit to B+ signal in the passenger airbag

ON/OFF indicator circuit for 2 seconds.

Passenger airbag ON/OFF indicator malfunction

Airbag sensor assembly malfunction

Integration control and panel

(Passenger airbag ON/OFF indicator)

Airbag sensor assembly

Cowl wire

DIDH1–01

H23994

Airbag Sensor
Assembly

PAON

A20

IM1

IGN1

23

4

L

16

I19
Passenger Airbag ON/OFF Indicator
(Integration Control and Panel)

3E

Sub J/B No. 3

5

P–AB

A20

17

IG2

A20

21

E1

A20

25

E2

A20

26

V

IM1

3

17

2

PAON

P–AB

IG+

3A

15

L

V

R–L

R–L

GAUGE

1C

2

1A

3

1E

7

1C

4

B

B–Y

I18
Ignition SW

IG1

AM1

IG2

AM2

2

6

5

1

Instrument Panel J/B

W–L

W–R

Instrument Panel J/B

Instrument Panel J/B

1A

1A

6

8

1F

1F

9

10

W–B

W–B

A

A

J8
J/C

W–B

W–B

1C

3

1C

6

1J

7

1L

1

AM1

W

W–R

Engine Room J/B

2C

1

2D

1

AM2

F10
Fusible Link Block

8

4

5

B

Battery

ALT

IE

B–R

2

1

B

DI–1228

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DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

1422

WIRING DIAGRAM

H22552

Ignition Switch

Passenger Airbag 
ON/OFF Indicator
(”ON”)

Passenger Airbag 
ON/OFF Indicator
(”OFF”)

ON

OFF

A

B

C

4 sec.

2 sec.

4 sec.

2 sec.

ON/OFF condition depends on the 
front passenger detection results.

ON

OFF

ON

OFF

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DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–1229

1423

INSPECTION PROCEDURE

1

Check passenger airbag ON/OFF indicator.

CHECK:
(a)

Turn the ignition switch to the ON position.

(b)

Check the passenger airbag ON/OFF indicator operation.

HINT:
Refer to the normal condition of the passenger airbag ON/OFF indicator (see page 

DI–1137

).

RESULT:

A:
During period ”A” in the illustration, even if both the ”ON” and ”OFF” passenger airbag ON/OFF
indicators normally come on, both of them do not go off during period ”B”.
During periods ”A” and ”B” in the illustration, even if both the ”ON” and ”OFF” passenger air-
bag ON/OFF indicators normally come on, both of them come on during period ”C”.
B:
During period ”A”, neither the ”ON” nor ”OFF” passenger airbag ON/OFF indicators come on,
or either of them does not come on.
During period ”C”, even if the front passenger seat is occupied, neither the ”ON” nor ”OFF”
passenger airbag ON/OFF indicators come on.

B

Go to step 7.

A

H24023

DI–1230

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DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

1424

2

Check integration control and panel (passenger airbag ON/OFF indicator).

PREPARATION:
(a)

Turn the ignition switch to the LOCK position.

(b)

Disconnect the negative (–) terminal cable from the bat-
tery, and wait for at least 90 seconds.

(c)

Disconnect the connectors from the airbag sensor as-
sembly.

(d)

Connect the negative (–) terminal cable to the battery,
and wait for at least 2 seconds.

CHECK:
(a)

Turn the ignition switch to the ON position.

(b)

Check the passenger airbag ON/OFF indicator operation.

OK:

Neither the ”ON” nor ”OFF” passenger airbag ON/
OFF indicators come on.

NG

Go to step 3.

OK

Replace airbag sensor assembly (see page 

RS–82

).

3

Prepare for inspection.

PREPARATION:
CAUTION:
Be sure to perform the following procedures before troubleshooting to avoid unexpected airbag de-
ployment.
(a)

Turn the ignition switch to the LOCK position.

(b)

Disconnect the negative (–) terminal cable from the battery, and wait for at least 90 seconds.

(c)

Disconnect the connectors from the airbag sensor assembly.

(d)

Disconnect the connectors from the steering wheel pad.

(e)

Disconnect the connectors from the front passenger airbag assembly.

(f)

w/ Side and curtain shield airbag:
Disconnect the connectors from the side airbag assembly LH and RH.

(g)

w/ Side and curtain shield airbag:
Disconnect the connectors from the curtain shield airbag assembly LH and RH.

(h)

Disconnect the connectors from the front seat outer belt LH and RH.

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