Signal Missing
Signal missing
Checking diagnostic trouble codes (DTCs) in the central electronic module (CEM)
If there are diagnostic trouble codes (DTCs) stored in the central electronic module (CEM) or in the transmission control module (TCM) for communication problems or for the back-up lamps, these must be fault traced first.
Are any diagnostic trouble codes (DTCs) stored in the central electronic module (CEM) or in the transmission control module (TCM) for communication problems or for the back-up lamps?
Yes - DONE
No - Checking the transmission
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Checking the transmission
Does the car have automatic transmission?
Yes - Checking the wiring and terminals (automatic transmissions)
No - Internal fault
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Checking the wiring and terminals (automatic transmissions)
- Ignition off.
Check the brake control module (BCM) and transmission control module (TCM) connectors. Check for damaged or bent terminal pins. Check for contact resistance. Check for oxidation.
Check the wiring for CAN communication. Check between the brake control module (BCM) terminal #11 (#A11) and terminal #2 (#B12) on the transmission control module (TCM). Check between the brake control module (BCM) terminal #6 (#A6) and terminal #8 (#A8) on the transmission control module (TCM). Check for an open-circuit. Check for a short-circuit to ground. Check for a short-circuit to supply voltage.
Remedy as necessary.
Other information
- To connect the breakout box, brake control module (BCM), see: Connecting the breakout box, B5254T7 Connecting the Breakout Box, Brake Control Module (BCM)
- To connect the breakout box to the transmission control module (TCM), see: Connecting the breakout box, AW55-50/51SN Connecting Breakout Box, Transmission Control Module (TCM)
- Checking wiring and terminals Checking Wiring and Terminals
Continue - Verification
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Internal fault
Replacing the component
The central electronic module (CEM) has registered an internal fault.
If the fault is intermittent, it has been registered previously but is no longer present. Intermittent faults can be caused by interference at start up of the central electronic module (CEM) or may be a different type of fault which occurs on different occasions. The fault is evaluated depending on how it occurs. Replace the central electronic module (CEM) if the fault recurs.
Replace the central electronic module (CEM) if the fault is permanent.
Remedy as necessary.
Other information
- Control module relay box passenger compartment Service and Repair
Continue - Fault-tracing information
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Fault-tracing information
Information
Fault-tracing information
In case of this defect, troubleshooting is not followed by verification.
The information can be displayed again or the fault-tracing for this fault can be interrupted.
Do you want to view the information again?
Yes - Attempt New Test
No - FAULT FOUND
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Attempt New Test - Replacing the component
FAULT FOUND - DONE
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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
- Reconnect the connectors, components, etc.
- Test drive the car according to: Test Drive Form (DSTC (dynamic stability and traction control) /brake control module), description Test Drive Form (DSTC (Dynamic Stability and Traction Control) /Brake Control Module), Description
- Ignition on.
Read off the status of the diagnostic trouble code (DTC).
Is the status of the diagnostic trouble code (DTC) intermittent?
Yes - VERIFIED
No - VERIFICATION FAILED
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VERIFICATION FAILED - Fault-tracing information
VERIFIED - FAULT FOUND
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Fault-tracing 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 - Exit fault-tracing
No - Attempt New Test
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Attempt New Test - Checking diagnostic trouble codes (DTCs) in the central electronic module (CEM)
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