Fault In Power Supply

Fault in power supply

Checking the connectors




- Ignition on.
Activate the siren.
A short audible acknowledgement signal should be heard from the siren.









Is the function OK?

Yes - Intermittent fault

No - Checking the connectors

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Checking the connectors




- Ignition off.
- Check the control module and siren connectors for contact resistance and oxidation and remedy according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault.
- Reinstall the components and connectors etc.
- Ignition on.
Activate the siren.
A short audible acknowledgement signal should be heard from the siren.
If the function is now OK this indicates that the fault was caused by poor contact in the connectors.

Other information:
- To access / replace the control module see VGLA-control module VGLA-Control Module.
- To access / replace the siren, see Siren Replacing Siren.









Is the function OK?

Yes - FAULT FOUND

No - Checking the wiring

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Checking the wiring




- Ignition off.
Check passenger compartment fuse 17.

Hint: If the fuse is blown, check the circuit after fuse 17 for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault.

Check the cable between control module #B15 (#A41) and siren #5 for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault and for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault. Check the cable between passenger compartment fuse 17 and siren #4 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault.

Other information:
- The voltage between siren #4 and ground should be battery voltage.
- For further information about signals and other values, see Signal specification, lock and alarm, (VGLA) Signal Specification.
- To connect the breakout box, see Connecting the breakout box, lock and alarm (VGLA) Connecting The Breakout Box, Lock And Alarm (VGLA).
Remedy as necessary.









Select "Continue" when complete.

Continue - Verification

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Verification

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








- Reinstall the connectors, components etc.
- Ignition on.
Activate the siren.
A short audible acknowledgement signal should be heard from the siren.









Is the function OK?

Yes - FAULT FOUND

No - Fault-tracing information

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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 - FAULT-TRACING FAILED

No - Attempt New Test

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FAULT-TRACING FAILED - No Fault Found

Attempt New Test - Checking the connectors

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Intermittent fault
Check the cable between control module #B15 (#A41) and siren #5 for an intermittent short-circuit to ground according to Checking wiring and terminals. Intermittent faults Checking Wiring And Terminals. Intermittent Faults and an intermittent open-circuit according to Checking wiring and terminals. Intermittent faults Checking Wiring And Terminals. Intermittent Faults. Check the cable between fuse 17 and siren #4 for an intermittent open-circuit according to Checking wiring and terminals. Intermittent faults Checking Wiring And Terminals. Intermittent Faults.

Other information:
- For further information about signals and other values, see Signal specification, lock and alarm, (VGLA) Signal Specification.
- To connect the breakout box, see Connecting the breakout box, lock and alarm (VGLA) Connecting The Breakout Box, Lock And Alarm (VGLA).









Select Continue.

Continue - Fault-tracing information
No Fault Found

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Fault-tracing information




Information

Fault-tracing information
If the fault is intermittent, do not verify fault-tracing if the fault does not recur.
It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).

Do you want to view the information again?

Yes - Attempt New Test

No - FAULT FOUND

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FAULT FOUND - FAULT FOUND

Attempt New Test - Checking the connectors

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