Signal Missing

Signal missing

Checking the power supply and ground




- Ignition off.
Check fuse F4 in the fusebox in the engine compartment. Also check the circuit after the fuse. Check for an open-circuit. Check for a short-circuit to ground.
Check the fuse for the power socket in the cargo compartment on the central electronic module (CEM). Also check the circuit after the fuse. Check for an open-circuit. Check for a short-circuit to ground.
Check the cable between the accessory electronic module (AEM) and the ground terminal. Check for an open-circuit. Check for a short-circuit to ground. Check for a short-circuit to supply voltage.
Connect a voltmeter between the power supply cable and ground at the accessory electronic module (AEM). The voltage must be approximately 12V with the ignition switched off.
Check the ground terminal for the accessory electronic module (AEM). Check for contact resistance and oxidation.

Other information
- Connecting the breakout box Connecting the Breakout Box, Central Electronic Module (CEM)
- Connecting the breakout box Connecting the Breakout Box, Accessory Electronic Module (AEM)
- Signal specification Signal Specification, Accessory Electronic Module (AEM)
- Control module relay box passenger compartment Service and Repair
- Accessory control module (AEM) Accessory Electronic Module (AEM), Replacing
- Checking wiring and terminals Checking Wiring and Terminals









Was a fault detected?

Yes - Verification

No - Checking communication

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Checking communication

Hint: The CAN communication with the control module is OK if the control module ID can be read off. In that case the fault is probably intermittent and will then be more difficult to trace.

Try to communicate with the accessory electronic module (AEM) by reading off the control module ID.
Click the symbol for VCT2000 to begin reading off.









Continue - Signal missing

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Signal missing

No Fault Found - No Fault Found

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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.
- Switch on the ignition for at least 10 seconds.
Read off the control module ID from the accessory electronic module (AEM) by clicking on the VCT2000 symbol.





Could the control module ID be read off?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFIED - FAULT FOUND

VERIFICATION FAILED - Fault-tracing information

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Fault-tracing information

Attempt New Test - Checking the power supply and ground

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