Collision Avoidance and Parking Assist Systems: Testing and Inspection
Eliminating symptoms on body exterior: Reworking sensor for ParkAssist (front warning signal when there is no obstacle)
Tools
General information
Symptom.
Front ParkAssist warning signal sounds when there is no obstacle in the way at a speed of < 16 km/h (< 10 mph).
Causes and remedial action
Causes
- Unapproved number plate covers are fitted (e.g. covers with advertising text).
- The fastening screws used to secure the number plate are too long.
- The isolating ring on the sensor for ParkAssist is damaged (deformed) or not fitted correctly.
- Replacement sensors in the dealer organisation are painted fully or are not painted correctly.
Remedial action
In the event of a complaint, correct the malfunction in accordance with the procedure described below and replace defective components.
Tools and materials
Tools
PIWIS Tester 9718
Materials
955.606.659.01. - Isolating ring
955.606.275.03. - Sensor for ParkAssist
Procedure for correcting front ParkAssist malfunction
Correcting causes of fault on the number plate cover (number plate)
1. Check that the country-specific number plate cover is fitted.
INFORMATION: To prevent ParkAssist malfunctions, the country-specific number plate cover must always be used.
1.1. If this is not OK: Install country-specific number plate cover.
1.2. If this is OK: ( Step 2
2. Check to see if an additional number plate cover -1- (with or without advertising text -2- ) is fitted.
INFORMATION:
- Covers (with or without advertising text) that are fitted in addition to the country-specific number plate cover are not permitted on vehicles with front ParkAssist (the sensor detects these as an interfering contour).
- Please pass this information on to your customers.
2.1. If this is not OK: Remove the number plate cover (with or without advertising text -2- ) and use the country-specific number plate cover -1- instead. Continue ( Step 3
2.2. If this is OK: ( Step 3
3. Check to see if there is an air gap -A-A- between the front apron -1- and the country-specific number plate cover -2-.
INFORMATION:
- An air gap is created if the number plate is secured using fastening screws that are too long.
- The tip of the screw is supported on the front apron. As a result, the secured number plate cover shifts away from the front apron (air gap) and triggers the ParkAssist warning.
3.1. If this is not OK: Secure the number plate -3- using suitable (shorter) fastening screws -4-. Continue ( Step 4
3.2. If this is OK: ( Step 4
4. Perform a visual inspection of all sensors.
INFORMATION:
Possible fault entry in the fault memory due to environmental conditions:
- A fault can occur if the sensors are heavily soiled or iced-up, for example.
4.1. If sensors are heavily soiled or iced-up: Clean the surface of the sensors using suitable cleaning agent. Continue ( Step 5
4.2. If this is OK: ( Step 5
5. Check sensors for faults using the PIWIS Tester.
INFORMATION:
- During the system test, it is essential to guarantee the power supply for the PIWIS Tester using a battery charger (with a current rating of at least 40 A).
- The PIWIS Tester instructions take precedence and in the event of a discrepancy, these are the instructions that must be followed (deviations can occur with higher software versions for example).
5.1. Connect the PIWIS Tester to the vehicle and start the Tester. Switch on the ignition and press >> to continue.
5.2. Select - 'Vehicle type'.
5.3. Press (| to switch to - 'Control units'. Perform an automatic control unit search.
5.4. Select - 'ParkAssist' and confirm your selection by pressing >>.
5.5. Select - 'Fault memory' and confirm your selection by pressing >>.
6. Assess the fault memory.
6.1. If this is not OK (= fault entry): Refer to procedure below ( 'Correcting causes of fault on sensor for ParkAssist'.
6.2. If this is OK (= no fault entry): Disconnect the PIWIS Tester from the vehicle and carry out a test drive.End of remedial action.
Correcting causes of fault on sensor for ParkAssist
1. Select - 'Fault memory' and confirm your selection by pressing >>.
2. >> must then be pressed before selecting - 'Extended fault memory'.
3. Evaluate the fault type in the extended fault memory.
4. Remove the problematic sensor.
CAUTION:
Incorrect handling of sensor
- Sensor malfunction
- Risk of squashing
- Repainting of sensors is not permitted.
- Replace the sensor if the paint is damaged.
- Follow guidelines for painting sensor for ParkAssist.
5. Visually check the removed sensor -1- and isolating ring -2-.
5.1. If the isolating ring -2- is not OK (= deformed): Replace the isolating ring.
5.2. If the isolating ring is OK: Install a new sensor -1-.
6. Erase the fault memory.
6.1. Select - 'Erase fault memory' and confirm by pressing >>.
7. Disconnect the PIWIS Tester from the vehicle and carry out a test drive. End of remedial action.