Restraint Systems - General Diagnostics and Tests: Other Volvo S60 I

Checking the Power Supply And Ground Terminals

Power supply, supplemental restraint system module (SRS)

The supplemental restraint system module (SRS) is powered via two power inputs.

When the ignition is switched on, at least one of the power inputs is powered and the supplemental restraint system module (SRS) is in active mode.

1. Power input 1 terminal #55 is X-supplied via the ignition switch when it is in positions I and II. This power input is used to supply power to the supplemental restraint system module (SRS)
2. Power input 2 terminal #56 is supplied with +15 via the ignition switch when it is in positions II and III. This power input is used to power the supplemental restraint system module (SRS).

The two independent power supplies are used to facilitate supply of power to the supplemental restraint system module (SRS) for longer in the event of a collision. In the event of simultaneous open-circuits in both power supplies, the supplemental restraint system module (SRS) will not be active.

Checking the power supply

Check the power supply cable from the battery to the ignition switch. Check for an open-circuit. Check for loose connections. Check for contact resistance. Check for oxidation. Check the fuse.

Check the power supply cables from the ignition switch to supplemental restraint system module (SRS) terminals #55 and #56. Check for an open-circuit. Check for loose connections. Check for contact resistance. Check for oxidation.

1. The voltage to terminal #55 must be approximately battery voltage when the ignition is in positions I and II
2. The voltage to terminal #56 must be approximately battery voltage when the ignition is in positions II and III.

Ground terminal, supplemental restraint system module (SRS)

The supplemental restraint system module (SRS) is grounded when it is screwed into place in the car.

Checking the ground terminal

Check the ground connection between the supplemental restraint system module (SRS) and the ground terminal. Check for resistance. With the ignition off and the supplemental restraint system module (SRS) installed in the vehicle, the resistance measurement between the supplemental restraint system module (SRS) and the ground terminal must be approximately 0 ohms.

Take readings between the metal casing on the supplemental restraint system module (SRS) and the ground terminal.

Remedy as necessary.

Other information

1. See «Connecting the Breakout Box»(ref-415277-S13345697312011081500000)
2. See «Signal Specification»(ref-415383-S32911803732011081500000)
3. See the relevant wiring diagram for information about circuit and ground terminals in the bodywork
4. See «Wiring Harness Supplemental Restraint System (SRS)»(ref-415277-S00556335332011081500000)
5. See «Checking Wiring And Terminals»(ref-415229-S12487452032011081500000) .

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 color to color. 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

See Battery, Disconnecting

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

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.

Checking Power Supply And Ground Terminals

Checking the power supply

1. Check the fuse for the SRS control module in the fusebox in the passenger compartment. NOTE: If a fuse is blown, check the circuit after the fuse for a short-circuit to ground. See «Short-Circuit To Ground, Permanent Faults»(ref-445645-S03095448922012010600000) before replacing the fuse. Then replace the fuse. For further information about the circuit after the fuse, refer to the appropriate wiring diagram
2. Check the power supply cable between the X-supply from the ignition switch and control module terminal #27B (55). Check for an open-circuit. See «Open-Circuit, Permanent Faults»(ref-445645-S09104300882012010600000)
3. Check the power supply cable between the 15-supply and control module terminal #28B (56). Check for an open-circuit. See «Open-Circuit, Permanent Faults»(ref-445645-S09104300882012010600000) . Check for a short-circuit to ground. See «Short-Circuit To Ground, Permanent Faults»(ref-445645-S03095448922012010600000) .

Checking the ground terminal

1. The SRS control module is grounded when it is screwed into place in the car.

Remedy as necessary

Other information

1. To access and replace the SRS control module and the connector, see «Supplemental restraint system module (SRS), replacing»(ref-415382-S13556479412011081500000) .
2. To connect the breakout box, see «CONNECTING THE BREAKOUT BOX»(ref-415277-S07777720272011081500000)
3. The voltage to terminal #27B (55) must be battery voltage when the ignition is in positions I and II
4. The voltage to terminal #28B (56) must be battery voltage when the ignition is in positions I and II
5. With the ignition off and the SRS control module installed, the resistance between the control module casing and the ground terminal should be approximately 0 ohms.
6. For other values, see «Signal Specification»(ref-415383-S32911803732011081500000) .

Scheme 8

Scheme 9

Connecting the Breakout Box

Special tools

9512886

9511428

1. Switch off the ignition. Wait 10 seconds
2. To expose the supplemental restraint system module (SRS), see: «Supplemental restraint system module (SRS), replacing»(ref-415382-S13556479412011081500000) .

Connect one or two breakout boxes 9511428 to the adapter.

Supplemental restraint system module (SRS)

1. Connect adapter «9512886»(ref-403953-S24343994672011061500000) to the 84-pin connector on the control module (cable harness side)
2. For the 84-pin connector, terminals #1-#60 correspond to terminals #1-#60 on the breakout box which is connected to adapter terminal A. Terminals #61-#84 on the 84-pin connector correspond to terminals #1-#24 on the breakout box which is connected to adapter terminal B.