Signal Too Low

Signal too low

Checking the power supply




- Ignition off.

Check the voltage to ground at the following points:
Rear main fuse.
Rear fuse.
The voltage must be at least battery voltage minus 3 V.
Check that the fuses are intact.
Remedy as necessary.

Other information:
- For information about the fuses and ground terminals, see the applicable wiring diagram.









Was the fault found?

Yes - Verification

No - Checking the power supply and ground on the Accessory Electronic Module (AEM)

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Checking the power supply and ground on the Accessory Electronic Module (AEM)
Check the power supply to the Accessory Electronic Module (AEM). Check between the breakout box terminals for the power supply (#52) and ground (#51). The voltage must be at least battery voltage minus 3 V.
Check the control module connector. Check for contact resistance and oxidation. Check for loose connections. Check for damage carefully.
Check the wiring between the Accessory Electronic Module (AEM) (breakout box for ground terminal #51) and ground. Check for an open-circuit.
Remedy as necessary.

Other information:
- To connect the breakout box, see Connecting the breakout box. Accessory electronic module Connecting the Breakout Box, Accessory Electronic Module (AEM)
- To access or replace the Accessory Electronic Module (AEM) and connector, see Accessory electronic module (AEM), replacing Accessory Electronic Module (AEM)
- For information about signals, see Signal description. Accessory electronic module (AEM) Signal Description, Accessory Electronic Module (AEM)
- To fault-trace wiring and terminals see Checking wiring and terminals Checking Wiring And Terminals
- For information about the fuses and ground terminals, see the applicable wiring diagram.






Continue - Verification

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Verification




Verification

Verification

Hint: After carrying out the repair, check that the fault has been remedied.








- Ignition off
- Reconnect the components, connectors etc.
- Ignition on.
Read off the power supply for the accessory electronic module by clicking on the VCT2000 symbol.
The voltage must be at least battery voltage minus three volts.





Is the voltage 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




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 - FAULT-TRACING FAILED

No - Attempt New Test

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FAULT-TRACING FAILED - No Fault Found

Attempt New Test - Checking the power supply

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