Signal Missing

Signal missing

Checking the wiring








- Ignition off
- Disconnect central electronic module (CEM) connector D.
The Diagnostic Trouble Code (DTC) indicates that the communication between the Central Electronic Module (CEM) and audio/telephone switch is not working.
This may be due to a fault in the signal cable between the control modules or a damaged communication device in one or all of the control modules.
Check the connectors for loose connections, damaged or bent terminal pins and oxidation.
Check the signal cable. Check for an open-circuit. Check for a short-circuit to ground.
Take readings between:
- The Central Electronic Module (CEM) #D58 (#58) and audio/telephone switch #2.
Also check the intermediate connectors.
Remedy as necessary.

Other information
- Connecting the breakout box Connecting The Breakout Box, Central Electronic Module (CEM)
- Signal specification Signal Description, Central Electronic Module (CEM)
- Location of components Locations
- Steering wheel module (SWM), replacing Service and Repair
- Keypad steering wheel, replacing, TF-80SC AWD, TF-80SC Keypad Steering Wheel, Replacing
- Checking wiring and terminals Checking Wiring And Terminals

Was a fault detected?

Yes - Verification

No - Replacing the control module

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Replacing the control module
Try a new audio/phone switch.
Remedy as necessary.

Other information
- Keypad steering wheel, replacing, TF-80SC AWD, TF-80SC Keypad Steering Wheel, Replacing

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.
Check that the function for the relevant button or switch is OK.

Is the function 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

Attempt New Test - Checking the wiring

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