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Volume 4.1

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LOCATION:    13.6 Anti-Theft Alarm (ATA)   >   23 Electrical Test Program - Test


Electrical Test Program - Test

Test scope Test connection
Test condition Nominal value Possible cause/ remedy
1.0
PSE control module (A37)
Voltage supply
Circuit 30



3
(2)
A37





4
(2)

-


11 - 14 V

Wiring.
    Circuit 30 3
(2)
2
(2)

-
11 - 14 V Wiring.
2.0 Left front door
switch (S17/3)
Alarm circuit
A37

60
(1.14)



A37
4
(2)
Left front door:
closed
open

< 1 V
11 - 14 V
Wiring,
S17/3
3.0 Right front door
switch (S17/4)
Alarm circuit
A37

62
(1.16)



A37
4
(2)
Right front door:
closed
open

< 1 V
11 - 14 V
Wiring,
S17/4
4.0 Trunk lock/trunk illuumination rotary latch selector switch (S69/12)
Alarm circuit
A37

59
(1.13)



A37
4
(2)
Trunk lid:
closed
open

< 1 V
11 - 14 V
Wiring,
S69/12
5.0 Engine hood (S62)
Alarm circuit
A37

5



A37
4
(2)
Engine hood:
closed
open

< 1 V
11 - 14 V
Wiring,
S62
6.0   Glove box switch
(ATA) (S62/7)
Alarm circuit
A37

16



A37

4
(2)

Glove box:
closed
open

< 1 V
11 - 14 V
Wiring,
S62/7
7.0 Stop lamp switch (S9/1) Alarm circuit A37

3
(2)


A37

12

Ignition: ON
Apply service brake:
< 1 V
11 - 14 V
Wiring,
S9/1
8.0   Alarm horn (H3)
(only )
As of 06/97: all vehicles until
06/98
A37
3
(4)




A37
4
(2)
Insert bridge.

Use bridges with 124 589 37 63 00 safety cables only.
Alarm sounds.
Wiring,
H3
9.0   Alarm siren with auxiliary battery (H3/1)
Function
(as of 06/98)
 


 
HHT activation:
Alarm siren test.
Siren emits short acoustic signal for .2 sec seconds.
9.1
9.1   Voltage supply
2
H3/1


1
Disconnect connector at
H3/1
11 - 14 V Wiring.
9.2   Trigger alarm
 


 


 
Activate ATA.
Wait 15 seconds.
Disconnect connector at
H3/1

To interrupt alarm, reconnect H3/1 connector and deactivate ATA.
Acoustical
and
Optical
alarm function.
H3/1

Wiring,
A37
10.0   Not applicable for U.S.A. vehicles  


 
     
11.0   Headlamp
Alarm circuit
A37
1
(2)

A37
4
(4)
Insert bridge.

Use bridges with 124 589 37 63 00 safety cables only.
Headlamps are illuminated continuosly. Wiring,
Illumination control module (N7-1)
12.0   Taillamp
Alarm circuit
A37
1
(2)

4
(2)




A37
4
(4)

4
(4)
Insert bridge.

Use bridges with 124 589 37 63 00 safety cables only.
Left/right taillamps are illuminated continuosly. Wiring,
Illumination control module (N7-1)
13.0   ATA status/towing protection switch (S85/3)
Deactivate anti-tow protection
A37
6
(3)

A37
3
(2)
Press top part of S85/3 switch.
< 1
Wiring,
S85/3
14.0   ATA status indication via:
Interior switch (S6/1s1)
or
ATA status/towing protection switch (S85/3)
A37
11
(3)

A37
4
(2)

Use bridges with 124 589 37 63 00 safety cables only.
LED in switch illuminates. Wiring,
S85/3 or S6/1s2
15.0
ATA tow sensor (B33)
Voltage supply
(only with anti-tow protection)

5
B33

2
Activate ATA. 11 - 14 V
Wiring.
15.1   Trigger alarm
(simulation)

1
B33

5
Disconnect connector at B33.
Insert bridge.

Use bridges with 124 589 37 63 00 safety cables only.
Alarm is triggered.
Wiring,
A37
If values are OK:
B33

Connector Layout - Pneumatic control module (A37)

1 Connector 1 (PSE control lines)
1 Connector 2 (PSE voltage supply)
3 Connector 3 (ATA control lines)
4 Connector 4 (ATA electrical consumer connections)
 
    P80.20-2037-10

Connector Layout - ATA tow sensor (B33)

1 Data
2 Voltage supply (+)
5 Ground
 
    P80.50-2017-01

Connector Layout - Alarm siren with auxiliary
battery (H3/1)

1 Voltage supply +
2 Ground
3 Data
 
    P80.50-2019-01