Signal Too Low. Permanent Fault

Signal too low. Permanent fault

Checking the relay




- Ignition off.
Check that relay 2/29 is installed correctly. At the same time check the relay connections, in particular 2/29 #2, for a short circuit to ground as described in Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Also check the relay circuit for any open circuits, as described in Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.

Additional information:
- To replace relay, see Central electronic module (CEM), replacing Central Electronic Module (CEM), Replacing.
- To connect the test box, see Connecting the breakout box Connecting the Breakout Box, Central Electronic Module (CEM).













Is there a fault?

Yes - Verification

No - Replacing the component

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Replacing the component
Replace relay as described in Central electronic module (CEM), replacing Central Electronic Module (CEM), Replacing.


Continue - Verification

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Verification




Verification

Verification

Hint: After the repair it is necessary to check that the fault has been rectified.








- Ignition off.
- Connect connectors, install components etc.
- Ignition on.
Activate the heater by clicking on the symbol for VCT 2000.

Additional information:
- For information on how the heater works in operation, see Engine coolant heater, test running Engine Coolant Heater, Test Running.
- For a description of the parameters, see Description of parameters Description of Parameters.
- For a description of activations, see Activating components/functions Activating Components/Functions.





Does it work?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFIED - Fault Found

VERIFICATION FAILED - Trouble-shooting information

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Trouble-shooting 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 relay

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