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Diagnostic Manual, Body and Accessories,
Volume 4.1

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LOCATION:    13.2 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
ATA control module (N26)
Voltage supply
Circuit 30
Circuit 15


4

4
N26




2

18



Ignition: ON


11 - 14 V
11 - 14 V
Wiring,
1.1

2.0   Left front door lock
switch (S86/1, up to 01/94)
or
Activation via RCL


11






19
N26





N26




2






2
Ignition: OFF

Hold key in unlock position
or depress and hold IR
transmitter button (green
lamp flashes).


Hold key in lock position or
depress and hold IR
transmitter button (red
lamp flashes).
< 1 V

11 - 14 V








11 - 14 V

Wiring,
PSE control module (A37)
(see D.M., Body and Accessories,
Vol. 1.1, section 3.1 >23
),
RCL (see D.M., Body and
Accessories, Vol. 1, section 4.2
23
).


3.0   Right front door lock switch (S87/1, up to 01/94)
or
Activation via RCL


11






19
N26





N26






2






2
Ignition: OFF

Hold key in unlock position
or depress and hold IR
transmitter button (green
lamp flashes).


Hold key in lock position or
depress and hold IR
transmitter button (red
lamp flashes).
< 1 V

11 - 14 V








11 - 14 V
Wiring,
PSE control module (A37)
(see D.M., Body and Accessories,
Vol. 1, section 3.1 23
),
RCL (see D.M., Body and
Accessories, Vol. 1, section 4.2
>23
).

4.0   Trunk lid lock switch (S88/2, up to 01/94)
or
Activation via RCL



11






19

N26





N26



2






2

Ignition: OFF

Hold key in lock position or
depress and hold IR
transmitter button (red
lamp flashes).


Hold key in unlock position
or depress and hold IR
transmitter button (green
lamp flashes).
< 1 V

11 - 14 V







11 - 14 V
Wiring,
PSE control module (A37)
(see D.M., Body and Accessories,
Vol. 1, section 3.1 >23
),
RCL (see D.M., Body and
Accessories, Vol. 1, section 4.2
>23
).


5.0

Except Coupé
Left/right rear door switch (S17/5, S17/6) alarm circuit



25

N26




2

Close left/right rear door.

Open left/right rear door
and then close .

< 1 V


11 - 14 V
Wiring,
S17/5, S17/6,
PSE control module (A37)
(see D.M., Body and Accessories,
Vol. 1, section 3.1 >23
).
6.0 Left/right front door switch (S17/3, S17/4) alarm circuit


24
N26



2
Close left/right front door.

Open left/right front door
and then close .
< 1 V


11 - 14 V
Wiring,
S17/3, S17/4,
PSE control module (A37)
(see D.M., Body and Accessories,
Vol. 1, section 3.1 >23
).
7.0 Rotary tumbler/trunk lid microswitch (S88/1) alarm circuit

26
N26



2
Close rotary lock switch by
hand.

Open rotary lock switch by
hand.
< 1 V



11 - 14 V
Wiring,
PSE control module (A37)
(see D.M., Body and Accessories,
Vol. 1, section 3.1 >23
).
8.0 Engine hood switch (S62) alarm circuit


27
N26



2
Engine hood closed.

Engine hood open.
< 1 V

11 - 14 V
Wiring,
S62,
N26.
9.0 Stop lamp switch alarm circuit


4
N26



23
Ignition: ON

Apply service brakes.
< 1 V

11 - 14 V
Wiring,
Stop lamp switch (S9).
10.0 ATA contact connector (radio) alarm circuit
(running change during M.Y. 1996)


17
N26



2
Radio installed and
connector connected.

Radio removed.

11 - 14 V

< 1 V
Wiring,
ATA contact connector (X42/13),
Radio ground.
11.0 Ignition alarm circuit


4
N26



18
Ignition: OFF

Ignition: ON
< 1 V

11 - 14 V
Wiring,
Ignition/starter switch (S2/1).
12.0 Left front door
actuator (S47)


32

N26





2


Disconnect RCL control
module (N54) connector
(vehicles up to 01/94 only).

Unlock vehicle at driver's
door or via RCL.

Lock vehicle from driver's
door or via RCL.







< 1 V



11 - 14 V
Wiring,
S47
13.0   Alarm horn (H3) 1)

2
N26



13
Connect horn to circuit 30. Horn sounds. Wiring,
H3.
14.0   Diagnosis output


22

N26





2

Ignition: OFF
Disconnect N26 connector
Connect adapter for
impluse counter to X11/4.



1 23
Disconnect N26 connector
11 - 14 V Wiring,
N26.
15.0   Not applicable for U.S.A. vehicles
-
-
-
- - -
16.0   Headlamp alarm circuit 1)


2
N26



12
  Headlamps illuminate
(low beams).
Wiring,
Headlamp unit.
17.0   Left taillamp unit, backup lamp (E3e3)

2
N26



14
  Left backup lamp illuminates. Wiring,
E3e3
18.0   Right taillamp unit, backup lamp (E4e3)

2
N26



3
  Right backup lamp illuminates. Wiring,
E4e3
19.0


Not applicable for U.S.A. vehicles
-
-
-
- - -
20.0   ATA control module (N26)
Voltage supply
Circuit 30 output


15
N26



1
Connect to N26 11 - 14 V 1.0,
N26
21.0

Not applicable for U.S.A. vehicles
-
-
-
- - -
22.0


Not applicable for U.S.A. vehicles
-
-
-
- - -
23.0


Not applicable for U.S.A. vehicles -
-
-
- - -
24.0   Not applicable for U.S.A. vehicles
-
-
-
- - -
25.0
Starter lock-out relay module (K38) 1) 2)
Resistance


5
N26



18
Ignition: OFF
Disconnect N26 connector.
50 - 60 Wiring,
K38,
25.1
25.1   Circuit 15

4
N26



18
Ignition: ON
11 - 14 V Wiring,
Circuit 15,
25.2
25.2   Circuit 15
K38

4
Ignition: ON
11 - 14 V Wiring,
25.3
25.3   Control signal (circuit 31) from N26
5
K38

4
Ignition: ON
11 - 14 V Wiring,
N26,
25.4
25.4   K38
circuit 50

3
K38

1
Disconnect K38. Using a
2.5mm wire (12 AWG) ,
bridge K38, ignition switch
to position "3" (start)
Engine starts. Wiring,
K38,
Ignition/starter switch (S2/1),
Starter (M1).
26.0   ATA status indicator (E33) in Interior CL switch (S85)

8
N26

2
  ATA status indicator (E33) illuminates. Wiring,
2.0, 3.0, 4.0, 12.0,
S85,
N26
27.0   Not applicable for U.S.A. vehicles -
-
-
- - -
28.0   Not applicable for U.S.A. vehicles -
-
-
- - -
29.0   Not applicable for U.S.A. vehicles -
-
-
- - -
30.0   Not applicable for U.S.A. vehicles -
-
-
- - -
31.0   Not applicable for U.S.A. vehicles -
-
-
- - -
32.0   Not applicable for U.S.A. vehicles -
-
-
- - -
1) Can be activated using HHT.
2) As of 01/94, starter lock-out function controlled by central locking system (PSE control module).