Toyota Sequoia (2005). Manual - part 413

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DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–1447

1641

DTC

B1835/58 Short in Curtain Shield Airbag (LH) Squib

Circuit

DTC

B1836/58 Open in Curtain Shield Airbag (LH) Squib

Circuit

DTC

B1837/58 Short in Curtain Shield Airbag (LH) Squib

Circuit (to Ground)

DTC

B1838/58 Short in Curtain Shield Airbag (LH) Squib

Circuit (to B+)

CIRCUIT DESCRIPTION

The curtain shield airbag LH squib circuit consists of the airbag sensor assembly and the curtain shield air-
bag assembly LH.
The circuit instructs the SRS to deploy when deployment conditions are met.
These DTCs are recorded when a malfunction is detected in the curtain shield airbag LH squib circuit.

DTC No.

DTC Detection Condition

Trouble Area

B1835/58

The airbag sensor assembly receives a line short circuit

signal 5 times in the curtain shield airbag LH squib circuit

during primary check.

Curtain shield airbag LH squib malfunction

Airbag sensor assembly malfunction

Curtain shield airbag assembly LH

(curtain shield airbag LH squib)

Airbag sensor assembly

Floor wire No. 2

B1836/58

The airbag sensor assembly receives an open circuit sig-

nal in the curtain shield airbag LH squib circuit for 2 se-

conds.

Curtain shield airbag LH squib malfunction

Airbag sensor assembly malfunction

Curtain shield airbag assembly LH

(curtain shield airbag LH squib)

Airbag sensor assembly

Floor wire No. 2

B1837/58

The airbag sensor assembly receives a short circuit to

ground signal in the curtain shield airbag LH squib circuit

for 0.5 seconds.

Curtain shield airbag LH squib malfunction

Airbag sensor assembly malfunction

Curtain shield airbag assembly LH

(curtain shield airbag LH squib)

Airbag sensor assembly

Floor wire No. 2

B1838/58

The airbag sensor assembly receives a short to B+ circuit

signal in the curtain shield airbag LH squib circuit for 0.5

seconds.

Curtain shield airbag LH squib malfunction

Airbag sensor assembly malfunction

Curtain shield airbag assembly LH

(curtain shield airbag LH squib)

Airbag sensor assembly

Floor wire No. 2

DIDHP–01

H01454

C11
Curtain Shield Airbag
LH Squib

Airbag Sensor Assembly

A19

4

ICL+

Y–B

1

2

Y

A19

3

ICL–

DI–1448

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DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

1642

WIRING DIAGRAM

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DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–1449

1643

INSPECTION PROCEDURE

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.

1

Check DTC.

CHECK:
(a)

Proceed to each step according to how to read DTC.
(1)

If using the hand–held tester (read the 5–digit of DTC):
Using the hand–held tester, check the DTCs (see page 

DI–1147

).

RESULT:

DTC B1835 is output.

A

DTC B1836 is output.

B

DTC B1837 is output.

C

DTC B1838 is output.

D

(2)

If not using the hand–held tester (read the 2–digit of DTC):
Check the DTCs (see page 

DI–1147

).

RESULT:

DTC 58 is output.

E

HINT:
Codes other than DTC B1835, B1836, B1837, B1838 and DTC 58 may be output at this time, but they are
not related to this check.

B

Go to step 4.

C

Go to step 5.

D

Go to step 6.

E

Go to step 7.

A

H01019

H16275

H23590

Airbag 
Sensor 
Assembly

ICL+

ICL–

Floor Wire No. 2

A

B

C

D

Curtain Shield 
Airbag LH Squib

C11

DI–1450

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DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

1644

2

Check connector.

CHECK:
Check that the floor wire No. 2 connector (on the curtain shield airbag assembly LH side) is not damaged.
OK:

The lock button is not disengaged, or the claw of the lock is not deformed or damaged.

NG

Repair or replace floor wire No. 2.

OK

3

Check floor wire No. 2 (short).

PREPARATION:
Release the activation prevention mechanism built into con-
nector ”B” (see page 

DI–1137

).

CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:

Tester Connection

Condition

Specified Condition

C11–1 (ICL+) – 

C11–2 (ICL–)

Always

1 M

Ω

 or higher

NG

Repair or replace floor wire No. 2.

OK

Go to step 10.