Signal Too Low

Signal too low

Checking the function





Checking the rain sensor

Checking the function




- Ignition on
- Activate the rain sensor.

Hint: The wiper blades make a reference stroke to determine the cleanliness and condition of the windshield when the rain sensor is activated. The rain sensor is deactivated when the ignition is switched off. To reactivate the rain sensor with the ignition on, move the stalk to position "0" and then to intermittent wiping.

Spray water on the windshield where the rain sensor is positioned.
The wiper blades must now wipe the windshield clean.

Hint: In cars equipped with the rain sensor it replaces the intermittent function. One way of checking the function of the rain sensor is to twist the collar on the lever. This changes the sensitivity of the rain sensor. The windshield wiper should make one stroke. If the intermittent or high speed functions are activated it indicates that the rain sensor function is missing.


Continue - ANOTHER TEST

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ANOTHER TEST - Checking the wiring

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Checking the wiring




Hint: The wiring between the upper electronic module (UEM) and the rain sensor consists of two cables.

- Windshield wiper stalk in position "0".
Check the cable between upper electronic module (UEM) terminal #13 (#A13) and rain sensor terminal #1. Check for a short-circuit to ground.

Hint: The upper electronic module (UEM) terminal #20 (#A20) is signal ground.

Remedy as necessary.

Other information:
- Upper electronic module (UEM) rear view / door mirror, replacing Service and Repair
- Rain sensor Service and Repair
- Signal specification Signal Specification, Upper Electronic Module (UEM)
- Connecting the breakout box Connecting the Breakout Box
- Checking wiring and terminals Checking Wiring And Terminals.














Continue - Verification

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Verification




Verification

Verification

Note! After carrying out the repair, check that the fault has been remedied.








- Ignition off
- Reinstall the connectors, components etc.
- Ignition on
- Activate the rain sensor.

Hint: The wiper blades make a reference stroke to determine the cleanliness and condition of the windshield when the rain sensor is activated. The rain sensor is deactivated when the ignition is switched off. To reactivate the rain sensor with the ignition on, move the lever to position 0 and then to intermittent wiping.

Spray water on the windshield where the rain sensor is positioned.
The wiper blades must now wipe the windshield clean.

Is the rain sensor functioning?

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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Attempt New Test - Checking the function

FAULT-TRACING FAILED - No Fault Found

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