Keyless Entry - Door Handle Touch Sensor(s) Inoperative
57 Door handle touch sensors (Advanced key) inoperative
57 11 52
2027353/1
August 17, 2011.
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Affected Vehicles
Condition
The exterior door handle touch sensors (Advanced key) are inoperative on one or several doors.
The key blade can be used mechanically (driver door or trunk) or remote electrically (key remote buttons) to unlock and lock the vehicle.
^ Any or all of the following DTC 03285, 03286, 00192, or 00193 (Outside door handle touch sensor - short to ground or incorrect signal) may be
stored in the Access and Start Authorization Control Module J393 (address word 05).
- OR -
^ No relevant DTC stored.
Technical Background
Concept-related restrictions
1. Advanced key functions can temporarily be disabled by interference from transmitters in close proximity to remote key, using the same frequency
range (e.g. cell phones, wireless headphones, other vehicle keys etc.) as no positive identification is possible.
2. If the customer reaches into the door handle while touching the lock sensor to lock the vehicle it will not be locked. This is because the unlocking
command from the sensor is sent at the same time and has a higher priority.
3. The Advanced key system needs a short response time for the key identification. When grabbing and pulling the door handle very quickly, the key
may not yet be identified and the vehicle does not unlock.
4. Unlocking the door after locking it is not possible for a brief period. This allows the customer to check that the door is locked by pulling the
handle.
5. To reduce power consumption the door handle touch sensors are deactivated after the vehicle has been parked for a few days. It is then necessary
to first wake the vehicle by pulling the door handle once and then a second time to open the vehicle.
6. If the vehicle battery is discharged the energy management system gradually deactivates unnecessary convenience functions. It is possible that you
will temporarily not be able to unlock your vehicle using Advance key.
Advanced Key System Component Issues
1. The magnet under the cap of the door handle may not be installed.
2. After driving through a car wash or in the rain the advanced key system is intermittently inoperative as water may enter the door handle touch
sensor rubber sleeve and prevent proper operation.
3. Incorrect touch sensors installed.
Tip: If a DTC for any one of the door handle touch sensors is permanently stored into the Access and Start Authorization Control Module J393
(address word 05), the advance key feature will not work for all the doors.
Production Solution
Optimized door handle touch sensors
Service
1. Explain the concept related-restrictions to the customer. If the customer is not experiencing these issues proceed with the following steps.
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2. Check Measured Value Block 43 in Access and Start Authorization Control Module J393. If the second bit from the right (Hall sensor) of the
affected door handle is always 1 the handle must be checked for an installed magnet.
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3. Pull the affected door handle open and check if the magnet is installed (indicated as position 8 in ETKA illustrations and seen in Figures 3-5).
If the magnet is missing, install the magnet.
4. If the second bit from the right of the affected door handle is 0, using Guided Fault Finding check the wiring of each door handle for which a DTC
is logged in the Access and Start Authorization Control Module J393. If there are no problems with the wiring, procedure with step 5.
5. Check in Measured Value Block 43 the locking and unlocking function using Advanced key for every door handle. If a door handle does not
respond properly proceed to step 6.
6. Remove the touch sensors from the door handles to check the part number. During the removal make sure that the sensor is pried out using a
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screwdriver according to the repair manual.
7. Replace all door handle sensors with part number 8K0 927 753 or 8K0 927 753A. Part numbers 8K0 927 753B and 8K0 927 753C are optimized
- do not replace them.
Warranty
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Required Parts and Tools
Additional Information
All parts and service references provided in this TSB are subject to change and/or removal. Always check with your Parts Department and service
manuals for the latest information.
