Caution: Accidental deployment of an airbag can cause serious injury, so only carry out the operations and use only the tools specified in this chapter.
1. To avoid injury due to inadvertent deployment of the airbag and inadvertent deployment of the pretensioner belt, when servicing these systems, you must carefully study and follow all the safety instructions in this chapter.
2. It is forbidden to use any electrical control devices when servicing directly or in the area where the elements of the SRS system are located, with the exception of those specified in this chapter.
3. Warning labels must be taken into account when servicing SRS elements.
4. Never attempt to repair the following items in the SRS system: SRS ECM, coiled wire, frontal airbag module (driver or passenger in the front seat), seat belt with pretensioner.
Attention: if a malfunction of any of the elements of the system is detected, they must be replaced exclusively in accordance with the methodology given in this chapter.
5. Do not repair SRS wiring connectors. If a defect is found in the connector, the entire wiring harness must be replaced. If a fault is found in the wire, replace or repair the wire harness according to the table "Checking the SRS ECM Wiring Harness".
Table for checking wiring harnesses of the SRS electronic control unit.
SRS electronic control unit connector (back view).
6. After disconnecting the cable from the negative battery terminal, wait at least 60 seconds before proceeding with further work. The SRS system is designed in such a way that after the battery is disconnected, sufficient voltage remains for a short time to deploy the airbag. Therefore, repairing the SRS system immediately after the battery has been disconnected may result in the airbags being unintentionally deployed and causing serious injury to service personnel.
7. Features of checking the wiring harness of the SRS electronic control unit:
To check, insert a thin probe from the back of the connector, as shown in the figure.
The connector pins have a special conductive coating that can be damaged if the front of the pins comes into direct contact with the probe.
8. When performing work in the areas of installation of elements of the SRS system (even if these works are not directly related to the SRS airbag) the following requirements must be met:
- A) When removing or installing parts, do not allow any shocks or impacts on the components of the SRS system.
Attention:
- SRS system components cannot withstand temperatures above 93° (SRS ECU, airbag modules and coiled wire), seat belts with pretensioners cannot withstand temperatures above 90°, therefore, before hot drying the car after painting, it is necessary to remove the above elements.
- Store SRS components removed from the vehicle in a clean and dry place. The airbag module should be stored on a flat surface with a pad (soft side) up. Do not place foreign objects on these parts.
- b) After reinstalling the SRS system components, check the operation of the SRS indicator and verify that the system is operating normally.
9. When connecting or disconnecting the scan tool, make sure the ignition key is in the "OFF" (OFF).