Signal Too Low

Signal too low

Checking the status




- Ignition on.
Instrument lighting
Activate the instrument lighting.
Check if the fault is permanent or intermittent.
The instrument lighting lights at full strength when activated.
The fault is permanent if the instrument lighting does not activate.
If the instrument lighting is activated, 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 the voltage on the light switch module (LSM) connector terminal #12 to the output on the central electronic module (CEM). The voltage must be approximately 12 V when the instrument lighting is activated.
Check the control signal cable. Check for a short-circuit to ground.
Take readings between:
- Central electronic module (CEM) terminal #A1 (#1) and light switch module (LSM) connector terminal #12.
Remedy as necessary.

Other information
- Connecting the breakout box Connecting the Breakout Box, Central Electronic Module (CEM)
- 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.
Click the VCT2000 symbol to activate and deactivate the instrument lighting.
Check that the function 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 component and wiring

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