Checking the Collision Cable

Checking the collision cable

Checking the cable

Note! Applies only to carphones with Volvo On Call.




- Ignition off
- Other units shut off.

Note! The test may make the central electronic module (CEM) activate the safety measures carried out when the airbag system has been activated. This is noticeable because the doors unlock, the interior lighting comes on and the engine will not start.

The collision cable runs from the SRS control module to the carphone module and the central electronic module (CEM). If the cable is defective, there is a risk that the safety measures in the central electronic module (CEM) and the emergency call from the carphone module will fail if the airbag system is activated.
Activate the voltage level read off by clicking on the VCT2000­symbol.
If the voltage level is:
1. between 0­0.1 V, there is a short-circuit to ground in the collision cable
2. between 0.2­0.6 V, the collision cable is OK
3. between 0.65­4.4 V, there is an open-circuit in the collision cable
4. above 4.8 V, there is a short-circuit to +12V in the collision cable.





Select one of the above options.

1 - Checking the cable

2 - DONE

3 - Checking the cable

4 - Checking the cable

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Checking the cable




- Ignition off
- Disconnect the battery negative terminal
- Disconnect central electronic module (CEM) connector D, carphone module connector A and the SRS control module connector.
Check the collision cable for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Take resistance readings between body ground and one of the following connectors:
- carphone module connector terminal A17 (#17)
- central electronic module (CEM) connector terminal 5D (#B5)
- SRS control module connector terminal 30 (#2B).
The resistance between a fault free cable and body ground should be infinite.
Remedy as necessary.

Other information:
- To repair the collision cable, see Cable harness Volvo on Call, repair Cable Harness Volvo On Call, Repair
- To connect the breakout box to the carphone module, see the relevant procedure.
- To connect the breakout box to the central electronic module (CEM), see Connecting the breakout box Connecting the Breakout Box, Central Electronic Module (CEM)
- To connect the breakout box to the SRS module, see Connecting the breakout box Connecting the Breakout Box, Supplemental Restraint System Module (SRS).






Continue - Verification

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Checking the cable




- Ignition off
- Disconnect the battery negative terminal
- Disconnect central electronic module (CEM) connector D, carphone module connector A and the SRS control module connector.
Check the connectors for loose connections according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check the collision cable for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Take resistance readings between body ground and one of the following connectors:
- carphone module connector terminal A17 (#17)
- central electronic module (CEM) connector terminal 5D (#B5)
- SRS control module connector terminal 30 (#2B).
The resistance for a fault free cable is approximately 0 ohms.
Remedy as necessary.

Other information:
- To repair the collision cable, see Cable harness Volvo on Call, repair Cable Harness Volvo On Call, Repair
- To connect the breakout box to the carphone module, see the relevant procedure.
- To connect the breakout box to the central electronic module (CEM), see Connecting the breakout box Connecting the Breakout Box, Central Electronic Module (CEM)
- To connect the breakout box to the SRS module, see Connecting the breakout box Connecting the Breakout Box, Supplemental Restraint System Module (SRS).






Continue - Verification

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Checking the cable




- Ignition off
- Disconnect the battery negative terminal
- Disconnect central electronic module (CEM) connector D, carphone module connector A and the SRS control module connector
- Ignition on
- Connect the battery negative terminal.

Caution! There must not be anyone inside the passenger compartment when the battery is connected.

Check the collision cable for a short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Use a voltmeter to take readings between battery ground and one of the following connectors:
- carphone module connector terminal A17 (#17)
- central electronic module (CEM) connector terminal 5D (#B5)
- SRS control module connector terminal 30 (#2B).
The voltage should be 0 V for a fault free cable.
Remedy as necessary.

Other information:
- To repair the collision cable, see Cable harness Volvo on Call, repair Cable Harness Volvo On Call, Repair
- To connect the breakout box to the carphone module, see the relevant procedure.
- To connect the breakout box to the central electronic module (CEM), see Connecting the breakout box Connecting the Breakout Box, Central Electronic Module (CEM)
- To connect the breakout box to the SRS module, see Connecting the breakout box Connecting the Breakout Box, Supplemental Restraint System Module (SRS).






Continue - Verification

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Verification




Verification

Verification

Hint: After carrying out the repair, check that the fault has been remedied.








- Ignition off
- Reinstall the connectors, components etc.
- Ignition on
- Connect the battery negative terminal.

Caution! There must not be anyone inside the passenger compartment when the battery is connected.

- Switch on the carphone.
Click the VCT2000 symbol to test the collision cable and verify that the fault has been remedied.
If the voltage level is:
1. between 0­0.1 V, there is a short-circuit to ground in the collision cable
2. between 0.2­0.6 V, the collision cable is OK
3. between 0.65­4.4 V, there is an open-circuit in the collision cable
4. above 4.8 V, there is a short-circuit to +12V in the collision cable.





Has the fault been remedied?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFIED - Fault Found

VERIFICATION FAILED - Info

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Info




Information

Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Do you want to exit fault-tracing?

Yes - FAULT-TRACING FAILED

No - Attempt New Test

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FAULT-TRACING FAILED - FAULT-TRACING FAILED

Attempt New Test - Checking the cable

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