Airbag Warning Light 2004 Toyota Celica

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Airbag

Warning Light

CbmA Connecte*

Canler AfcbOfl Senear A&samblv

AKSIO

INSPECTION PROCEDURE

D Preparation Check

2

Check connection of center airbag sensor assembly connector.

OK

NG Repair.

^ Preparation.

HUH

Q (1) Disconnect battery negative (-j terminal cable, and wait at least 20 seconds. (2) Remove steering wheel pad (See page AB-15) .

When storing steering wheel pad, keep upper surface of pad facing upward.

Check airbag warning light circuit.

0h| Center Airiwg SftnstN" As&emtoty

0h| Center Airiwg SftnstN" As&emtoty

(1) Disconnect center airbag sensor assembly connector.

(2) Connect negative (-) terminal cable to battery.

(3) Turn ignition switch ACC or ON.

Measure voltage LA terminal of harness side connector of center airbag sensor assembly.

Voltage: Battery voltage.

Repair airbag warning light circuit.

Does airbag warning light come on ?

Canter Airliag Sirtjor Assembly

Spiral Cable

ScMilnj Wheel Pad LSqui b)

A irb&cf Wiirlins Light itwn tw IT

(1) Disconnect negative (-) terminal cable from bat tery.

(2) Connect center airbag sensor assembly connec tor.

(3) Connect negative (-) terminal cable to battery.

(4) Turn ignition switch ACC or ON.

Check operation of airbag warning light.

Check terminal LA of center airbag sensor assembly and electrical connection check mechanism. If normal, replace center airbag sensor assembly. _ _

From the results of the above inspection, the malfunctioning part can now be considered normal. To make sure of this, use the simulation method to check.

6

Is new ECU-B fuse burnt out again?

YES

^ '. Using simulation method, reproduce mal. function symptoms (see page AB-32).

Check harness between ECU-B fuse and airbag warning light, and ECU-B fuse and center airbag sensor assembly.

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

1

Is diagnostic code 22 output again?

Cul* ZI

'SÚ1I4 *M11 b *HH *nnnn

O Clear malfunction code 41 stored in memory (See page AB-31).

13 (1) Turn ignition switch LOCK, and wait at least 2 seconds.

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

(3) Using SST, connect terminals Tc and E 1 of check connector. SST 09843-18020

(4) Check diagnostic code.

Ï.

Li

:u h

YES

H^rt '■. Using simulation method, reproduce malfunction symptoms (See page AB-32).

Replace center airbag sensor assembly.

Diag. Code

Center Airbag Sensor Assembly Malfunction

^ CIRCUIT DESCRIPTION

The center airbag sensor assembly consists of a 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 airbag must be activated, and diagnoses system malfunction.

Diagnostic code 31 is recorded when occurrence of a malfunction in the center airbag sensor assembly is detected.

Code No.

Diagnosis

31

• Center airbag sensor assembly malfunction.

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. . , NO Using simulation method,

Is diagnostic code 31 output again?

Using simulation method, reproduce malfunction symptoms

Replace center airbag sensor assembly.

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 code 31.

Preparation

Check

Is diagnostic code 31 output again ?

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5h I hi I MlIIH

Clear malfunction code 41 stored in memory (See page AB-31).

(1) Turn ignition switch LOCK, and wait at least

20 seconds.

(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 check connector. SST 09843-18020

(5) Check diagnostic code.

Using simulation method, reproduce malfunction symptoms (See page AB-32).

Replace center airbag sensor assembly.

Diag . Code 41

Malfunction Stored in Memory

If a malfunction occurs in the airbag system, malfunction codes 11 to 31 may be output, and when the battery is disconnected after the malfunction is repaired, malfunction codes 11 to 31 will be cleared, but code 41 will be output instead.

So long as the cancellation operation for a malfunction recorded in memory (See page AB-31) is not performed, code 41 recorded in the center airbag sensor assembly and the airbag warning light remains lit up.

Code No.

Diagnosis

41

• Malfunction recorded in memory.

• Center airbag sensor assembly malfunction.

DIAGNOSTIC CHART

Perform troubleshooting according to malfunction code output. .

1

Check operation of airbag warning light.

NG

2

Is diagnostic code 41 output again?

System is normal.

Check harness"between ECU-6 fuse and center airbag sensor assembly. I f normal, replace center airbag sensor assembly.

WIRING DIAGRAM.

Center Aklwg Sensor AssamtHy

Center Aklwg Sensor AssamtHy

INSPECTION PROCEDURE

Preparation

Check

Check operation of airbag warning light.

ACC ON

Clear malfunction code 41 stored in memory (See page AB-31).

(1) Turn ignition switch LOCK, and wait at least

2 seconds.

(2) Turn ignition switch ACC or ON, and wait at least

20 seconds.

(3) Check operation of airbag warning light. Airbag warning light turns off.

OK ; System is normal.

Is diagnostic code 41 output again?

ACC ON

MiUUL

|(1) Turn ignition switch ACC or ON, and wait at least 20 seconds.

(2) Using SST, connect terminals Tc and E, of check connector. SST 09843-18020

(3) Check diagnostic code.

Check harness between ECU-13 fuse and YES center airbag sensor assembly. If normal, replace center airbag sensor assembly._

Perform troubleshooting according to malfunction code output.

Airbag Warning Light System (Always Lit Up)

CIRCUIT DESCRIPTION ---

The airbag warning.light is located on the combination rneter.

When the airbag system is normal, the airbag warning light lights up for approx.6 seconds after the ignition switch is turned from LOCK position to ACC or ON position, and then turns off automatically. If there is a malfunction in the airbag system, the airbag warning light lights up to inform the driver of the abnormality.

When terminals Tc and E1 of the check connector are connected, the diagnostic code is displayed by the blinking of the airbag warning light.

DIAGNOSTIC CHART

A

Does airbag warning light turn off?

NO

Check airbag warning light circuit or terminal AB circuit of check

1

connector.

YES

Replace center airbag sensor assembly.

Center Airtias SoraOr Assembly /-

Fusibla

Lin*

Belter

ECU-B

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