Wiring Harness Supplemental Restraint System (SRS)
Wiring harness supplemental restraint system (SRS)
Special tools:
951 2620 Stripping tool 951 2620 Stripping Tool
951 2777 Hot-air gun 951 2777 Hot Air Gun
951 2785 Crimping tool 951 2785 Crimping Tool
Note! The illustrations in this service information are used for different model years and/or models. Some variation may occur. However, the essential information in the illustrations is always correct.
Caution! As the SRS system is a safety system, it is extremely important that these instructions are carefully followed when carrying out repairs in the cable harness.
Caution! Ensure that the new pin has the same type of surface treatment as the old.
Warning! Do not carry out any work on the cable for the SRS system until the connector has been disconnected from the relevant airbag or seat belt tensioner. There is otherwise a risk of static electricity deploying the component.
Preparatory work
Selection of repair kit, SRS system
Materials: SRS system repair kit for the selected car.
Note! Only special tools and materials from the SRS system repair kit for the selected car must be used. Choose a repair location where there is plenty of room to guarantee that work is of the highest quality.
The cables should always be connected colour to colour. If the repair terminal colors do not correspond with the vehicle, check with the wiring diagram for the vehicle in question. In the cases where the repair terminals have a completely orange cable then this is always fitted to terminal No. 1. In the cases where the repair terminals have a blue and a brown cable, then blue is No. 1 and brown is No. 2.
Removing the battery lead and the ignition cable
Disconnect the negative battery cable. See: Battery disconnecting and connecting Battery Disconnecting and Connecting
Disconnect the relevant ignition cable. See: Igniter wire connector Igniter Wire Connector
Assembly
Cutting and stripping pairs of cables
Release the cable from the cable harness so that you have plenty of room in which to work.
Note! The maximum permitted twinned length after splicing is 100 mm. This is to prevent interference problems.
Cut the cables so that there is approximately 40 mm between the splices (center to center) (A).
Strip off 5.0 mm of the insulation on the 4 cable ends. Use: 951 2620 Stripping tool 951 2620 Stripping Tool.
Twin the cable cores on the stripped ends of the cables.
Caution! Ensure that all the cores are twinned.
Crimping the sleeve
Install a crimp sleeve from the repair kit in the press tool: 951 2785 Crimping tool 951 2785 Crimping Tool
Squeeze the crimping tool a little to secure the crimping sleeve in the tool.
Insert the cable as far into the crimp sleeve as it will go.
Ensure that the cable insulation does not get into the crimping area or that stripped cable does not extend outside the sleeve.
Press the pliers' handles as far as they will go to ensure a proper joint. The pliers release automatically.
Check by hand that the crimping sleeve is secure.
Prepare the remaining cable ends in the same way.
Heating the crimping sleeve
Hold a putty knife or other suitable protection behind the heat-shrink tubing to shield the surrounding components from heat.
Heat the sleeve with hot air gun: 951 2777 Hot-air gun 951 2777 Hot Air Gun and a suitable nozzle. It is important that the heat-shrink tubing is shrunk around the cable. It should be possible to see some adhesive that has squeezed out around the cable.
Finishing
Securing the cable for the SRS system
Secure the new cable for the SRS system next to the old cable using a tie strap or similar. Reinstall the connectors.
Installing the battery cable
Install the battery negative lead. See Battery disconnecting and connecting Battery Disconnecting and Connecting
Checking and adjusting the SRS system
Turn the ignition to position 2.
Check the SRS system to ensure that the warning lamp comes on and stays on while the SRS system performs a self-test. The lamp must go out after a few seconds. If not, perform fault-tracing according to VIDA vehicle communication.
If everything is working, reinstall other components.
Test drive the vehicle.