WARNING!!! SRS Airbag systems contain explosive devices. Do Not touch unless you have been trained and know what you are doing.
What Is The SRS Airbag System
SRS stands for Supplementary Restraint System, and is an addition to conventional seatbelts. It comprises of an ECU (Electronic Control Module), sensors, one or more airbags and sometimes seatbelt pretensioners. In event of an accident the module will detonate explosive charges inside the airbags and pretensioners. The pretensioners pull the seatbelts tight against the passengers and the airbags balloon out and protect the passengers from the hard surfaces inside the vehicle. The SRS module is constantly monitoring itself, the sensors, airbags and pretensioners. When the ignition is turned on SRS/Airbag light comes on and will only go out after it has completed a self check, and all is OK. If detects a fault when the ignition is switched on, or while driving, it will turn the light on and it will not go out until the module is reset and the fault is no longer present.
What To Do If The SRS Airbag Light Comes On
The first is step is to find out why the module has turned the light on. On most modern cars this involves plugging in a Scantool to the cars diagnostic port and communicating with the module. If the module is operating correctly then it will have logged a fault code or maybe multiple codes, which will indicate what part of the system the fault or faults have occured in.
Fault Diagnosis and Repair
The next stage is find exactly where the fault is in the faulty circuit. This usually involves using specialised test equipment, once located the faulty part can be replaced or the faulty wiring repaired. At Khandallah garage we have the test equipment and training to diagnose and repair SRS Airbag problems on most makes of car.
Common Faults
- Wiring Faults
- Flat Battery
- Pretensioners
- Clock Spring
- SRS Module
- Sensors
