Signal Missing. Intermittent Fault.

Signal missing. Intermittent fault.

Check connectors
Check connector 54/3R and central electronic module (CEM) connector for contact resistance and oxidation as described in Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults , and for a loose contact as described in Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Check especially for any damage.

Hint: If cause of fault is found, then install components, connect connector etc.
If cause of fault is not found do not install central electronic module (CEM) until you have completed the trouble-shooting.

Additional information:
- To access central electronic module (CEM) connector, see Central electronic module (CEM), replacing Central Electronic Module (CEM), Replacing.
- To connect the test box to the control unit, see Connecting the breakout box Connecting the Breakout Box, Central Electronic Module (CEM)
- For information about signals and other values, see Signal specification Signal Specification





Is there a fault?

Yes - DONE

No - Checking the wires

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Checking the wires
Check the wire between central electronic module (CEM) connector 20A and ignition lock connector 50 for an intermittent open circuit as described in Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults , and for a short circuit to ground as described in Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.

Additional information
- The voltage should be the same as the battery voltage with the key in position III.
- To access/replace the CEM connector, see Central electronic module (CEM), replacing Central Electronic Module (CEM), Replacing
- To connect a test box, see Connecting the breakout box Connecting the Breakout Box, Central Electronic Module (CEM)
- For information about signals and other values, see Signal specification Signal Specification













Continue - DONE

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