Signal Missing

Signal missing

Checking the power supply and ground terminal




- Ignition off.
Check that the fuse for the rain sensor in the central electronic module (CEM) is intact. If the fuse is blown, check the subsequent circuit for a short-circuit to ground. Then replace the fuse.
Check the power supply cable between rain sensor module (RSM) terminal #A1 and central electronic module (CEM) terminal #H7. Check for an open-circuit.
Check the ground lead between rain sensor module (RSM) terminal #A2 and central electronic module (CEM) terminal #D10. Check for an open-circuit.
Check the signal cable between central electronic module (CEM) terminals #H23 (#37) and rain sensor module (RSM) terminal #A3. Check for an open-circuit. Check for a short-circuit to supply voltage.
Remedy the cables as necessary.
Switch on the ignition. Check that the relay for extended X-supply is activated.
Click the VCT2000 symbol to read the relay status.

Other information
- Connecting the breakout box Connecting the Breakout Box, Central Electronic Module (CEM)

- Checking wiring and terminals Checking Wiring and Terminals













Was a fault detected?

Yes - Verification

No - Checking communication

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Checking communication




- Ignition on.
Check that communications with the rain sensor module (RSM) are working by reading out the control module part number.
Click the symbol for VCT2000 to begin reading off.





Can the serial number be read off?

Yes - Verification

No - Replacing the control module

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Replacing the control module




- Ignition off.
If no fault is discovered on the cables for the control module, the rain sensor module (RSM) will probably need to be replaced.

Other information
- Rain sensor Service and Repair

Continue - Verification

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Fault-tracing information

Attempt New Test - Checking the power supply and ground terminal

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Verification




- Ignition off
- Reconnect cables and switches
- Ignition on.
Check rain sensor communication by reading out the control module part number.
Click the symbol for VCT2000 to begin reading off.





Can the control module ID be read out?

Yes - FAULT FOUND

No - Fault-tracing information

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