Signal Missing or Too Low. Intermittent Fault

Signal missing or too low. Intermittent fault

Checking the wiring
- Remove relay 2/115.
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.
For further information about intermittent open-circuits, see Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.

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.
Check for an intermittent open-circuit according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
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 Relay/fuse box cargo compartment/Rear electronic module (REM), replacing Integrated Relay/Fusebox Cargo Compartment/Rear Electronic Module (REM), Replacing.









Was a fault detected?

Yes - Fault-tracing information

No - Checking the control module for short-circuits

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Checking the control module for short-circuits
Measure the resistance between terminal #2 and ground when the relay driver is active.
The resistance should be high when the relay driver is active.
Replace the control module if the resistance is low.

Other information:
- To access the integrated relay / fusebox in the cargo compartment, see Relay/fuse box cargo compartment/Rear electronic module (REM), 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 wiring

FAULT FOUND - Fault Found

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