Anti-theft alarm (ATA [EDW]) Diagnosis troubleshooting

AD80.50-P-5000D

Anti-theft alarm (ATA [EDW]) Diagnosis troubleshooting

1.2.12

I

Record customer complaint.

 For this purpose see also

Notes on anti-theft alarm (ATA [EDW])

AD80.50-P-2000-01D

II

Connect STAR DIAGNOSIS and read out fault memory

 Note fault code.

AD00.00-P-2000-04A

III

Call up and print out alarm source memory.

 The alarm source memory overview can be called up in Xentry Diagnostics under the function view:

- "Overall vehicle"

- "Security and locking system"

- "Anti-theft alarm system (ATA)"

- "Actual values"

- "Alarm sources"

- "Overview"

Call up the individual data records for specific details.

IV

Check whether there is a TIPS document for the customer complaint, fault code or alarm source.

 Follow instructions in TIPS document. Always observe the specified validity. If this does not lead to success or a TIPS document is not present, proceed on the basis of the available information.

Complaint

Cause (loud alarm source)

Notes

Remedy

Inadvertent activation of ATA [EDW]

(visual and acoustic alarm)

Contact switch

(engine hood, door, etc.)

- Associated hood, door or lid does not fit well so that contact switch is not actuated reliably.

Check installation position of affected components, correct if necessary

- Contact switch defective
(e.g. loose contact)

Check contact switch, replace if necessary

- Lines, connectors and contacts defective

Check lines and connectors, repair if necessary

- Ground contact faulty

Secure ground contact

Interior protection

(with code (882) Interior monitoring (with ATA only))

- Objects in vehicle can lead to reflections and thereby to erroneous alarm

 Objects, that led to triggering, have been removed from the vehicle by the customer.

Remove objects

- Insects in vehicle

- If a stationary heater has been retrofitted (as an accessory), air turbulence may lead to false alarms.

- Parameter record not updated

Update parameter record.:

"ATA [EDW]/Tow-away protection/interior protection"/ "Adaptations"/ "Start-up"

- Interior protection sensor not fastened properly

 Installation position:

The interior protection sensor is integrated into the ATA, which is integrated into the overhead control panel

Check whether overhead control panel is seated correctly

Tow-away protection

(with code (882) Interior monitoring (with ATA only))

- Tow-away protection sensor is not fastened correctly

The tow-away protection sensor is integrated into the ATA, which is integrated into the overhead control panel

Check whether overhead control panel is seated correctly

- Defects (e.g. leakage) can lead to level changes of the vehicle (with code (489) AIRMATIC (air suspension with continuous adjustment damping) when waking up the chassis CAN

Glass breakage loop

- Resistance value for glass breakage sensor too high
Nominal value to ground: R < 50 Ω (measured at connector on ATA control unit).

 The resistance can change due to jolts or depending on the temperature.

If the value is greater:

- Check glass breakage loops in windows individually (nominal value: R < 20 Ω)

Replace corresponding window

If the value for the glass breakage loops in the windows is okay:

- Check lines, connectors and ground connection

Repair lines, connectors and ground connection

Alarm siren

(siren self-alarm or interruption in communication with alarm siren)

(with code (882) Interior monitoring)

- Check by actuating with Xentry-Diagnostics

- Check power supply

- Check communication line

- Check signal with oscilloscope ("HMS")
(pass image: see A/C bus W203")

 It is necessary to actuate the alarm siren with Xentry diagnostics during testing.

Repair lines, connectors and ground connection

Panic alarm

(with code (763) Radio remote control with panic switch)

- Erroneous operation is possible (unintentional actuation of the transmitter key button, where applicable also be another transmitter key assigned to vehicle)

Repeats purely acoustic alarm

(with code (882) Interior monitoring)

No entry present

- Communication between alarm siren and ATA control unit interrupted sporadically