No Communication

No communication

Checking the component and wiring
The diagnostic trouble code indicates that communication between central electronic module and Siren control module (SCM) (optional equipment) or Remote Receiver Module (RRX) is not working. This may be due to a fault in the signal cable between the control modules or a defective communication device in one or all of the control modules.
Check the signal cable between the central electronic module (CEM) and the Siren control module (SCM). Check for an open-circuit. Check for a short-circuit to ground. Check for a short-circuit to supply voltage.
Take readings between:
- Central electronic module (CEM) terminal #G1 (#1) and siren (SCM) terminal #2.
Check the cable between the central electronic module (CEM) and the Remote Receiver Module (RRX). Check for an open-circuit. Check for a short-circuit to ground. Check for a short-circuit to supply voltage.
Take readings between:
- Central electronic module (CEM) connector terminal #A35 (#35) and Remote Receiver Module (RRX) terminal #5.

Other information
- Connecting the breakout box Connecting the Breakout Box, Central Electronic Module (CEM)
- Signal description Central Electronic Module (CEM) Signal Description, Central Electronic Module (CEM)
- Location of components Component Location, Central Electronic Module (CEM)
- Control module relay box passenger compartment Service and Repair
- Checking wiring and terminals Checking Wiring and Terminals









Was a fault detected?

Yes - Verification

No - Checking communication

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Checking communication
To check whether all the units are communicating, part numbers for the units can be read off.
Click on the VCT2000 symbol to start reading off the part no.





Do all the units respond?

Yes - Verification

No - Replacing the control module

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Replacing the control module
Try replacing the control module that did not respond with its part number.

Other information:
- Anti-theft protection siren, L.H.D Service and Repair

Was a fault detected?

Continue - Verification

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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.
Activate the alarm.
Activate the siren.
Check that the functions are OK.

Are the functions OK?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFIED - FAULT FOUND

VERIFICATION FAILED - 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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FAULT-TRACING FAILED - No Fault Found

Attempt New Test - Checking the component and wiring

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