How to Proceed With Troubleshooting

Malfunction symptoms of the supplemental restraint system are difficult to confirm, so the diagnostic trouble codes become the most important source of information when troubleshooting. Perform troubleshooting of the supplemental restraint system in accordance with the following procedure:

HINT: Do not disconnect the battery negative (-) terminal cable until step [3], Diagnostic Trouble Code Check and Recording, has been completed.

[1] Customer Problem Analysis
Using the CUSTOMER PROBLEM ANALYSIS CHECK SHEET for reference, ask the customer in as much detail as possible about the problem.

[2] Warning Light Check
Check the SRS warning light. If the light remains on, a malfunction is stored in the center airbag sensor, assembly, so proceed to step [3]. If the SRS warning light is not on, a malfunction has occurred in the SRS warning light circuit, so perform troubleshooting for 22.

HINT: 22 is recorded when a malfunction occurs in the SRS warning light system.

If an open malfunction occurs in the SRS warning light system, the SRS warning light does not light up, so that until the malfunction is repaired, the diagnostic trouble codes (including 22) cannot be confirmed.

[3] Diagnostic Trouble Code Check And Recording
Check the diagnostic trouble codes and make a note of any malfunction codes which are output. If a normal code is output, an abnormality in the power source circuit may have occurred, so perform troubleshooting for source voltage in step [8].
If 22 is output, skip steps [4] and [5] and proceed to step [7].

[4] Malfunction Code Clearance
Clear the malfunction code.

HINT: The malfunction code output in step [3] indicates that a malfunction has occurred in the circuit designated by the malfunction code, but does not indicate whether the malfunction is still occurring or whether it was in the past.

Accordingly, it is necessary to find out the present condition of the malfunction occurrence by clearing the malfunction code and performing the diagnostic code check again. If this operation is neglected and troubleshooting is performed using only the malfunction code confirmed in step [7], isolating the problem component becomes difficult and invites mistaken diagnosis.

[5] Diagnostic Trouble Code Check And Recording
After repeating ignition switch ON-OFF operation (ON: wait 20 seconds, OFF: wait 20 seconds.) 5 times, check the diagnostic trouble codes. If any code is output, the malfunction is still occurring, so proceed to step [7].

[6] Symptom Simulation
Bearing in mind that a malfunction code was registered in step [3], provided that the normal code is presently output, use the methods described in step [6] to simulate the malfunction.

NOTICE: When connecting the battery after clearing the malfunction code, always do it with the ignition switch in LOCK position. When the battery has been reconnected, turn the ignition switch to ACC or ON position after at least 2 seconds have elapsed. If the battery is reconnected with the ignition switch in ACC or ON position, or the ignition switch is turned to ACC or ON within 2 seconds of connecting the battery. it is possible that the diagnosis system will not operate normally.

[7] Diagnostic Trouble Code Chart
Proceed to the appropriate flow chart in step [8] in accordance with the malfunction code found in step [5] or [6].

[8] Circuit Inspection Repair

HINT: The following illustrations for CIRCUIT INSPECTION show each connector for the SRS squib circuit.

SRS Connector (Squib Circuit) Diagram:

(1) Steering Wheel Pad (Squib):

(2) Spiral Cable:

(3) Center Airbag Sensor Assembly:

(4) Front Passenger Airbag Assembly:

[9] Repair
Find out if the problem lies in a sensor, actuator or wire harness and connector, and repair the problem. After the problem part is repaired, re-install the disassembled parts. Do not start work until at least 90 secondsafter the ignition switch is turned to the LOCK position and the negative (-) terminal cable is disconnected.

CAUTION: If incorrect procedure is used, a malfunction may occur in the system or there is the danger that airbag may be accidentally deploy during the repair operation. Carefully read the GENERAL DESCRIPTION and the cautions for each operation, and perform repairs in the correct order using the correct methods.

[10] Malfunction Code Clearance
When all the malfunction codes found in steps [5] and [6] have been repaired, clear the malfunction codes.

[11] Diagnostic Trouble Code Check
After repeating ignition switch ON-OFF operation (ON: wait 20 seconds, OFF: wait 20 seconds.) 5 times, check the diagnostic trouble codes. If a code is displayed, return to step [7] and troubleshoot the displayed malfunction code.

NOTICE: When connecting the battery after clearing the malfunction code, always do it with the ignition switch in LOCK position. When the battery has been reconnected, turn the ignition switch to ACC or ON position after at least 20 seconds have elapsed.
If the battery is reconnected with the ignition switch in ACC or ON position, or the ignition switch is turned ACC or ON within 20 secondsof connecting the battery, it is possible that the diagnosis system will not operate normally.

[12] Confirmation Test
Check the warning light again and confirm that all the malfunctions have been repaired. If the warning light indicates an abnormality, repeat the operation again from step [2].