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

AD80.50-P-5000CW

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-2000-01CW

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 and printed out in Xentry Diagnostics under the following path.::

- "rear SAM control unit"

- "Actual values"

- "ATA [EDW] 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 On model 172, 207.4, 231 metallic objects should not be present in the center console compartment.

 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 set not updated
(on model 204, 207.3, 212, 218)

Update parameter record.:

"IRS interior protection and tow-away protection"/"Adaptation"/"Startup"

(code only when an optimized set of parameters is available)

- Interior protection sensor not fastened properly

 Installation position:

Model 204, 207.3, 212, 218:
The interior protection sensor is integrated into the interior protection control unit and tow-away protection, which is clipped directly into the overhead control panel control unit.

Check whether overhead control panel is seated correctly

Model 172, 207.4, 231:
The interior protection sensor is installed in the center console

Check whether the interior protection sensor is seated correctly.

Model 172:
The 2nd interior protection sensor (slave) is installed in the rear center console

Check whether 2nd interior protection sensor is seated correctly

Model 231:
The 2nd interior protection sensor (slave) is installed in the right door

Check whether 2nd interior protection sensor is seated correctly

Tow-away protection

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

- Tow-away protection sensor is not fastened correctly

 Installation location:
Model 204.0 up to 14.9.09:
The tow-away protection sensor is integrated into the alarm siren.

Check whether alarm siren is fastened correctly.

Model 172, 207.4, 231:
The tow-away protection sensor is integrated into the interior protection sensor, which is installed in the center console

Check whether interior protection control unit and tow-way protection are seated correctly

Model 204.0 as of 15.9.09, model 204.2/3/9, 212, 218:
interior protection sensor is integrated into interior protection sensor control unit and tow-away protection, which is clipped directly into the overhead control panel.

Check whether overhead control panel is seated correctly

- Defects (e.g. leakage) can lead to changes in the vehicle level when the vehicle CAN is woken up (with code (489) AIRMATIC (pneumatic suspension with continuously adjustable damping) or code (488) Steel/pneumatic suspension)

Glass breakage loop

(on model 204.2/9, 212.2)

- Resistance value for glass breakage sensor too high
Nominal value to ground: R < 50 Ω (measured at connector on interior protection and tow-away protection 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)

(on model 172, 207.4, 218, 231 except , ;

on model 204, 207.3, 212 up to 31.5.10;

on model 204, 207.3, 212 as of 1.6.10 except ,)

- 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

(model 172, 207.4, 218, 231 except , ;

Model 204, 207.3, 212 up to 31.5.10 or as of 1.6.10 except , )

No entry present

- Communication between alarm siren and rear SAM control unit interrupted sporadically.