Signal Missing or Too Low. Intermittent Fault

Signal missing or too low. Intermittent fault

Checking the control module for open-circuits




- Ignition off
- Remove relay 2/114
- Ignition on.
Check the driver circuit for the relay coil for an intermittent open-circuit as follows: activate the relay driver. Measure the voltage between terminals #1 and #2 on the relay base.

Hint: The voltage between terminals #1 and #2 should be battery voltage.
If the value deviates excessively, check the voltage between terminal #2 and the battery and between terminal #1 and ground. Both should equal battery voltage.
Do not forget to check that the power supply to the control module is OK.

Other information:
- To access the integrated relay / fusebox in the cargo compartment, see Integrated relay/fuse box cargo compartment/rear electronic module, replacing Integrated Relay/Fusebox Cargo Compartment/Rear Electronic Module (REM), Replacing
- Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.









Was a fault detected?

Yes - Fault Found

No - Checking the control module for short-circuits

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Checking the control module for short-circuits




- Ignition on.
Activate the relay driver.
Measure the resistance between terminal #2 and ground when the relay driver is active.
The resistance must be low when the relay driver is active.
Replace the control module if the resistance is high.

Other information:
- To access the integrated relay / fusebox in the cargo compartment, see Integrated relay/fuse box cargo compartment/rear electronic module, replacing Integrated Relay/Fusebox Cargo Compartment/Rear Electronic Module (REM), Replacing.






Continue - Fault-tracing information

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Fault-tracing information




Information

Fault-tracing information
If the fault is intermittent, do not verify fault-tracing if the fault does not recur.
It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).

Do you want to view the information again?

Yes - Attempt New Test

No - Fault Found

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Attempt New Test - Checking the control module for open-circuits

FAULT FOUND - Fault Found

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