Faulty Signal

Faulty signal

Checking the function




- Ignition on.
Check whether the alarm LED lights constantly. If so, there is a short-circuit to supply voltage in the cable from the central electronic module (CEM).
If the alarm LED does not light, check the operation of the alarm LED by activating it.
Click on the symbol for VCT2000 to begin activation.









Is the function OK?

Yes - Checking connectors and wiring

No - Checking the connector

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Checking the connector




- Ignition off
- Check central electronic module (CEM) connector B and the connector to the alarm LED. Check for contact resistance. Check for oxidation. Check for damage carefully.
Remedy as necessary.

Other information
- Connecting the breakout box Connecting the Breakout Box, Central Electronic Module (CEM)
- Signal specification Signal Description, Central Electronic Module (CEM)
- Location of components Component Location, Central Electronic Module (CEM)
- Sun sensor Service and Repair
- Checking wiring and terminals Checking Wiring and Terminals





Was a fault detected?

Yes - Verification

No - Checking the component and wiring

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Checking the component and wiring
Check the signal cable between the central electronic module (CEM) and the alarm LED. Check for an open-circuit. Check for a short-circuit to supply voltage.
Take readings between:
- Central electronic module (CEM) terminal #B5 (#5) and alarm LED terminal #3.
Check the ground lead between the central electronic module (CEM) and the alarm LED. Check for an open-circuit. Check for a short-circuit to supply voltage.
Take readings between:
- Central electronic module (CEM) terminal #B28 (#28) and alarm LED terminal #5.
Replace the sun sensor/alarm LED if no fault is found in the wiring.
Remedy as necessary.

Other information
- Connecting the breakout box Connecting the Breakout Box, Central Electronic Module (CEM)
- Signal specification Signal Description, Central Electronic Module (CEM)
- Location of components Component Location, Central Electronic Module (CEM)
- Sun sensor Service and Repair
- Checking wiring and terminals Checking Wiring and Terminals













Select "Continue" when the fault has been remedied.

Continue - Verification

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Checking connectors and wiring
Check central electronic module (CEM) connector B and the connector to the alarm LED. Check for contact resistance. Check for oxidation. Check for damage carefully.
Check the signal cable between the central electronic module (CEM) and the alarm LED. Check for an open-circuit. Check for a short-circuit to supply voltage.
Take readings between:
- Central electronic module (CEM) terminal #B5 (#5) and alarm LED terminal #3.
Check the ground lead between central electronic module (CEM) terminal and the alarm LED. Check for an open-circuit. Check for a short-circuit to supply voltage.
Take readings between:
- Central electronic module (CEM) terminal #B28 (#28) and alarm LED terminal #5.
Remedy as necessary.

Other information
- Connecting the breakout box Connecting the Breakout Box, Central Electronic Module (CEM)
- Signal specification Signal Description, Central Electronic Module (CEM)
- Location of components Component Location, Central Electronic Module (CEM)
- Sun sensor Service and Repair
- Checking wiring and terminals Checking Wiring and Terminals













Continue - Fault-tracing information

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Verification




Verification

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








- Ignition off
- Reinstall the connectors, components etc.
- Ignition on.
Check the function of the alarm LED by activating it. Click the VCT2000 symbol to start activation.





Can the alarm LED be activated?

Yes - Troubleshooting procedure complete

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 - Exit Fault-Tracing

No - Attempt New Test

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Attempt New Test - Checking the function

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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 - Exit Fault-Tracing

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Attempt New Test - Checking the function

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