How to Troubleshoot the SRS

DTC (Diagnostic Trouble Codes)


The self-diagnostic function of the SRS system allows it to locate the causes of system problems and then store this information in memory. For easier troubleshooting, this data can be retrieved via a data link circuit.


Precautions

Reading the DTC


1.Make sure the ignition switch is OFF.

2.Connect the HDS to the DLC (A).

 

3.Turn the ignition switch ON (II).

4.Make sure the HDS communication with the vehicle and the SRS unit. If does not, troubleshoot the DLC circuit.

5.Use the HDS to check for DTCs.

6.Read the DTC.

7.Turn the ignition switch OFF, and wait for 10 seconds.

8.Disconnect the HDS from the DLC.

9.Do the troubleshooting procedure for the DTC.

Erasing the DTC Memory


1.Make sure the ignition switch is OFF.

2.Connect the HDS to the DLC (A).

 

3.Turn the ignition switch ON (II).

4.Make sure the HDS communication with the vehicle and the SRS unit. If it does not, troubleshoot the DLC circuit.

5.In the SRS MENU of the HDS, select SRS, then DTC to erase DTC(s).

6.Turn the ignition switch OFF, and wait for 10 seconds.

7.Disconnect the HDS from the DLC.

Troubleshooting Intermittent Failures


If there was a malfunction, but it does not recur, it will be stored in the memory as an intermittent failure, and the SRS indicator comes on.

After checking the DTC, troubleshoot as follows:

1.Read the DTC (see ‘‘Reading the DTC'').

2.Erase the DTC memory (see ‘‘Erasing the DTC Memory'').

3.Set the parking brake, and start the engine, and let it idle.

4.The SRS indicator will come on for about 6 seconds and then go off.

5.Shake the related wire harness and connectors, and look for loose connections, poor pinfits, and poor grounds.

6.Take a test-drive (quick acceleration, quick braking, and cornering), turn the steering wheel fully left and right, hold it there for 5 to 10 seconds. If the problem recurs, the SRS indicator will come on.

NOTE: A faulty cable reel can cause intermittent connections related to the driver's airbag.

7.If you cannot duplicate the intermittent failure, the system is OK at this time.