Faulty Signal

Faulty signal

Checking the status




- Ignition on.
Activate reading off the rear left-hand seat belt buckle.
Check if the fault is permanent or intermittent.
Lock and unlock the rear left-hand seat belt buckle.

Hint: The signal level in the rear left-hand seat belt buckle must be approximately 5 volts when unlocked and approximately 0 volts when locked. If the signal level is between 1.3 volts and 2.6 volts, the sensor is defective.

The fault is permanent if the signal level does not change between unlocked and locked status.
If the signal level changes, this is an indication that the fault was present previously but that it is not active at the moment, i.e. the fault is intermittent.





Continue - Checking the component and wiring

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Checking the component and wiring
Check central electronic module (CEM) connector F and the seat belt buckle connectors. Check for contact resistance. Check for oxidation. Check for damage. Check for loose connections. Also check the intermediate connector.
Check signal cable for an open-circuit and short-circuit to supply voltage.
Take readings between:
- Central electronic module (CEM) terminal #F1 (#1) and right rear seat belt buckle, connector terminal #2.
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 Component Location, Central Electronic Module (CEM)
- Control module relay box passenger compartment Service and Repair
- Checking wiring and terminals Checking Wiring and Terminals













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.
Activate reading off the status. Click the VCT2000 symbol.
Activate and deactivate the function.
Check that the function is OK.





Is the function OK?

Yes - Troubleshooting procedure complete

No - Fault-tracing information

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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 the component and wiring

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