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Home >> Volvo >> 2000 >> C70 Convertible L5-2.4L Turbo VIN 56 B5244T >> Repair and Diagnosis >> Accessories and Optional Equipment >> Antitheft and Alarm Systems >> Keyless Entry >> Testing and Inspection >> Component Tests and General Diagnostics >> Checking Communication With Control Module >> Checking Communication With Control Module

Checking Communication With Control Module






Checking communication with control module

Checking power supply




- Ignition on.
Connect VCT 2000 and Check that the LED flashes.





Does the LED flash?

Yes - Checking SRS communication

No - Checking VCT 2000

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Checking SRS communication




- Ignition on.
Check that VCT 2000 is connected.
Try to establish communication with the SRS system.





Is there communication with SRS system?

Yes - Check function

No - Checking communication cable to data link connector (DLC)

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Check function
Remove the key from the ignition switch.
Try to lock and unlock the car with the key.

Can the car be locked and unlocked?

Yes - Checking for an open-circuit

No - Checking contact resistance and oxidation

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Checking for an open-circuit
Check cable between data link connector (DLC) terminal 7 and VGLA control module #B19 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.










Continue - Verification

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Checking VCT 2000





Fault-tracing information

Information
Fault-tracing is under development.
For further information about this diagnostic trouble code (DTC), select Information, then DTC information.

Continue - DONE

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Checking contact resistance and oxidation




- Check VGLA control module connector for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
- Ignition on.
VCT 2000 connected.
Try to establish communication with the VGLA system by reading out the status for the driver's door door switch.





Has communication with the VGLA system been established?

Yes - FAULT FOUND

No - Checking cables

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Checking cables








- Ignition off.
- Disconnect VGLA control module.
Check fuse 6.

Hint: If fuse 6 has blown, fault-trace the circuit after fuse 6 for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.

Check circuit before fuse 6 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Check cable between fuse 6 and VGLA control module #B1 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Check cable between VGLA control module #A1 and ground for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.

Other information:
- The voltage between VGLA control module #B1 and ground should be battery voltage.
Remedy as necessary.






Continue - Verification

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Checking communication cable to data link connector (DLC)








- Ignition off.
- VGLA control module disconnected.
- Disconnect VCT 2000 from the data link connector (DLC).
Connect an ohmmeter between data link connector (DLC) terminal 7 and VGLA control module connector #B19.





The ohmmeter should read approximately 0 ohms.

Not OK - Checking for an open-circuit

OK - Checking the communication cable

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Checking the communication cable








- Ignition off.
- Connect control module.
- Ignition on.
Connect a voltmeter between data link connector (DLC) terminal 7 and ground.





The voltmeter should read approximately 9-11 V

Low - Checking for a short-circuit

High - Checking for a short-circuit

OK - Checking communication with VGLA

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Checking for a short-circuit
Check cables between data link connector (DLC) terminal 7 and control modules connected to this cable for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.





Select Continue when the fault has been remedied.

Continue - Verification

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Checking for a short-circuit
Check cables between data link connector (DLC) terminal 7 and control modules connected to this cable for a short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.





Select Continue when the fault has been remedied.

Continue - Verification

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Checking communication with VGLA




- Ignition on.
VCT 2000 connected to data link connector (DLC).
Try to establish communication with the VGLA system.





Has communication with the VGLA system been established?

Yes - Fault cause and checking for contact resistance and oxidation

No - Checking VCT 2000

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Fault cause and checking for contact resistance and oxidation
The cause of the fault has been loose connections in the data link connector (DLC) or VGLA control module connectors.
Check data link connector (DLC) and VGLA control module connectors for contact resistance and oxidation and remedy according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.





Select Continue when the fault has been remedied.

Continue - Verification

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Verification

Hint: After carrying out the repair, check that the fault has been remedied as follows
that the fault is corrected as follows:








- Ignition off.
- Reconnect connectors, reinstall components etc.
- VGLA control module connected.
- Ignition on.
- VCT 2000 connected to data link connector (DLC).
Try to establish communication with the VGLA system by reading out the status for the driver's door door switch.





Has communication with the VGLA system been established?

Yes - FAULT FOUND

No - Fault-tracing information
No Fault Found

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Fault-tracing information




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 - Exit fault-tracing

No - Attempt New Test

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Attempt New Test - Checking power supply

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