Lexus SC300 / Lexus SC400. Service manual — part 803

YES

No

HINT: If diagnostic trouble code 22 is output, perform the following troubleshooting:

1

Is diagnostic trouble code 22 output again?

C

P

Clear malfunction.

1.

Turn ignition switch LOCK, and wait at least 20 sec-
onds.

2.

Turn ignition switch ACC or ON, and wait at least 20
seconds.

3.

Using SST, connect terminals Tc and E

1

of DLC2.

SST 09843–18020

4.

Check diagnostic trouble code.

Using simulation method, reproduce malfunction symp-
toms (See page

RS–65

).

Replace center airbag sensor assembly.

–

SUPPLEMENTAL RESTRAINT SYSTEM

TROUBLESHOOTING

RS–107

DTC

31

Center Airbag Sensor Assembly Malfunction

CIRCUIT DESCRIPTION

The center airbag sensor assembly consists of center airbag sensor, safing sensors, ignition control and drive
circuit, diagnosis circuit, etc.
It receives signals from the airbag sensors, judges whether or not the SRS must be deploy, and diagnoses sys-
tem malfunction.
Diagnostic trouble code 31 is recorded when occurrence of a malfunction in the center airbag assembly is de-
tected.

DTC No.

Trouble Area

31

Center airbag sensor assembly malfunction.

DIAGNOSTIC CHART

DIAGNOSTIC CHART

HINT: When a malfunction code other than code 31 is displayed at the same time, first repair the malfunction
indicated by the malfunction code other than code 31.

(See page

RS–65

).

RS–108

–

SUPPLEMENTAL RESTRAINT SYSTEM

TROUBLESHOOTING

YES

NO

INSPECTION PROCEDURE

HINT: When a malfunction code other than code 31 is displayed at the same time, first repair the malfunction
indicated by the malfunction code other than 31.

1

Is diagnostic rouble code 31 output again?

C

P

Clear malfunction.

1.

Turn ignition switch LOCK, and wait at least 20 sec-
onds.

2.

Turn ignition switch ACC or ON, and wait at least 20
seconds.

3.

Repeat operation in step (1) and (2) at least 5 times.

4.

Using SST, connect terminals Tc and E

1

of DLC2.

SST 09843–18020

5.

Check diagnostic trouble code.

Using simulation method, reproduce malfunction symp-
toms (See page

RS–65

).

Replace center airbag sensor assembly.

–

SUPPLEMENTAL RESTRAINT SYSTEM

TROUBLESHOOTING

RS–109

ASSEMBLY REMOVAL AND
INSTALLATION

COMPONENTS

SA09A–07

–

SUSPENSION AND AXLE

REAR DIFFERENTIAL

SA–81