Toyota Sequoia (2005). Manual - part 535

I26946

Airbag Sensor Assembly

Body ECU

A20

18

GSW

16

B6

GSW

Instrument Panel J/B

1A

7

1B

3

GR–R

B

–

DIAGNOSTICS

MULTIPLEX COMMUNICATION SYSTEM

DI–1935

2129

DTC

B1243

GSW terminal circuit malfunction

CIRCUIT DESCRIPTION

This DTC is indicated when open or ground short of the GSW terminal is detected.

DTC No.

DTC Detection Condition

Trouble Area

B1243

Open or ground short of GSW circuit

Airbag sensor assembly

Wire harness

Body ECU

WIRING DIAGRAM

DI1T3–09

DI–1936

–

DIAGNOSTICS

MULTIPLEX COMMUNICATION SYSTEM

2130

INSPECTION PROCEDURE

1

Check for open and short in wire harness and connector between body ECU and
airbag sensor assembly.

PREPARATION:
Disconnect connector ”A20” of the airbag sensor assembly and connector ”B6” of the body ECU.
CHECK:
Check for an open or short circuit in the harness and connector between the airbag sensor assembly and
body ECU.
OK:

There is no open or short circuit in the wire harness.

NG

Repair or replace wire harness or connector.

OK

2

Check the body ECU.

PREPARATION:
Check that DTC B1243 is indicated when another body ECU in good condition is installed.
CHECK:
Check if DTC B1243 is indicated after replacing the body ECU.
OK:

DTCs B1243 is not indicated.

NG

Replace the airbag sensor assembly.

OK

Replace the body ECU (Original body ECU is
failure).

I24369

A27
Automatic Light Control
Sensor

B6

12

CLTB

CLTS

CLTE

Body ECU

R–G

Y

1

4

3

4

3

BR

B6

B6

CLTB

CLTS

CLTE

–

DIAGNOSTICS

MULTIPLEX COMMUNICATION SYSTEM

DI–1937

2131

DTC

B1244

Light sensor circuit malfunction

CIRCUIT DESCRIPTION

This DTC is indicated when failure of the light sensor circuit is detected.

DTC No.

DTC Detecting Condition

Trouble Area

B1244

Malfunction of automatic light control sensor

Open or short in automatic light control sensor circuit

Automatic light control sensor

Wire harness

Body ECU

WIRING DIAGRAM

DI639–08

DI–1938

–

DIAGNOSTICS

MULTIPLEX COMMUNICATION SYSTEM

2132

INSPECTION PROCEDURE

1

Check automatic light control sensor.

Using hand–held tester:
PREPARATION:
(a)

Connect the hand–held tester to the DLC3.

(b)

Turn the ignition switch ON and hand–held tester main switch ON.

BODY ECU:

Item

Measurement Item/Display

(Range)

Normal Condition

Diagnostic Note

ILLUMINATE RATE

Illumination rate information/

MIN: 0 MAX: 99.99

Condition value will be displayed

Normal value: 0.8 ms to 22.0 ms

CHECK:
The value of the illumination rate should change in the following range when the light sensor is exposed to
the light or covered by a hand.
OK:

0.8 ms to 22.0 ms

HINT:
This is the time to be taken for the light sensor to generate one cycle of frequency according to the brightness.
When not using hand–held tester (See page 

BE–27

):

NG

Replace the automatic light control sensor.

OK