![](../../../logos/other/rarrd.gif) |
![](../../../logos/mb/mbhht.gif) |
Test scope |
Test connection |
Test condition |
Nominal value |
Possible cause/Remedy |
1.0 |
|
Voltage supply
(circuit 30)
Ground (right wheelhousing in trunk) W7
Wiring (circuit 30)
Voltage supply
(circuit 15)
|
27
W7
F20-6
Cir. 30
27 ![](../../../logos/mb/sockr.gif) |
|
|
Disconnect ground wire from .
Ignition: ON |
11 - 14 V
< 1
< 1
11 - 14 V |
F20-6 (auxiliary fuse holder in trunk)
W7 loose,
Open circuit.
Open circuit.
F1-8 (fuse and relay box). |
2.0 |
![](../../../logos/mb/thrdg.gif) |
Control signal
to CL supply pump (M14/1, M14/2)
Check wiring for short to circuit 31.
|
27 ![](../../../logos/mb/sockr.gif) |
N54
![](../../../logos/mb/buc35.gif) ![](../../../logos/mb/ohmmm.gif)
|
![](../../../logos/mb/sockl.gif) 23
|
Unplug IRCL control
module (N54). |
> 20 k![](../../../logos/other/uomega.gif) |
M14/1, M14/2.
Open circuit in wiring from N54 to M14/1 or M14/2. |
2.1 |
![](../../../logos/mb/sixdg.gif) |
Control signal
CL supply pump (M14/1 or M14/2)
Check wiring for short to circuit 30.
|
9 ![](../../../logos/mb/sockr.gif) |
N54
![](../../../logos/mb/ohmmm.gif)
|
![](../../../logos/mb/sockl.gif) 23
|
Disconnect M14/1 or M14/2 and N54.
Disconnect ground wire from .
|
> 20 k![](../../../logos/other/uomega.gif) |
Open circuit in wiring from N54 to
M14/1 or M14/2. |
2.2 |
|
Taillamp harness connector (X18/9)
and wiring from IRCL control module (N54) to CL supply pump (M14/1, M14/2)
for open circuit
|
M14/17 ![](../../../logos/mb/sockr.gif) |
|
N54
![](../../../logos/mb/sockl.gif) 23
|
Disconnect N54 and M14/1 or M14/2. |
< 1 ![](../../../logos/other/uomega.gif) |
Connector (X18/9) interrupted,
Open circuit in wiring from N54 to M14/1 or M14/2. |
3.0 |
![](../../../logos/mb/foudg.gif) |
Left front door IR
receiver (A26/1)
Red indicator lamp,
wiring for short to circuit 31 |
27 ![](../../../logos/mb/sockr.gif) |
N54
![](../../../logos/mb/ohmmm.gif)
|
![](../../../logos/mb/sockl.gif) 1
|
Disconnect N54. |
> 20 k![](../../../logos/other/uomega.gif) |
A26/1,
Open circuit in wiring from N54 to A26/1.
|
|
|
|
27 ![](../../../logos/mb/sockr.gif) |
N54
![](../../../logos/mb/ohmmm.gif)
|
![](../../../logos/mb/sockl.gif) 1
|
Remove A26/1. |
> 20 k![](../../../logos/other/uomega.gif) |
Open circuit in wiring from N54 to A26/1.
|
3.1 |
|
Wiring for short to circuit 30 or
open circuit
|
9 ![](../../../logos/mb/sockr.gif) |
N54
![](../../../logos/mb/ohmmm.gif)
|
![](../../../logos/mb/sockl.gif) 1
|
Disconnect N54.
Disconnect ground wire from .
|
> 20 k![](../../../logos/other/uomega.gif) |
A26/1,
Open circuit in wiring from N54 to A26/1. |
|
![](../../../logos/mb/sevdg.gif) |
|
9 ![](../../../logos/mb/sockr.gif) |
N54
![](../../../logos/mb/ohmmm.gif)
|
![](../../../logos/mb/sockl.gif) 1
|
Remove A26/1. |
> 20 k![](../../../logos/other/uomega.gif) |
Open circuit in wiring from N54 to A26/1.
|
|
|
|
A26/1
1 ![](../../../logos/mb/sockr.gif) |
|
N54
![](../../../logos/mb/sockl.gif) 1
|
|
< 1 ![](../../../logos/other/uomega.gif) |
Open circuit in wiring from N54 to A26/1. |
3.2 |
![](../../../logos/mb/fivdg.gif) |
Left front door IR
receiver (A26/1)
Green indicator lamp,
wiring for short to circuit 31 |
27 ![](../../../logos/mb/sockr.gif) |
N54
![](../../../logos/mb/ohmmm.gif)
|
![](../../../logos/mb/sockl.gif) 20
|
Disconnect N54. |
> 20 k![](../../../logos/other/uomega.gif) |
A26/1,
Open circuit in wiring from N54 to A26/1.
|
|
|
|
27 ![](../../../logos/mb/sockr.gif) |
N54
![](../../../logos/mb/ohmmm.gif)
|
![](../../../logos/mb/sockl.gif) 20
|
Remove A26/1. |
> 20 k![](../../../logos/other/uomega.gif) |
Open circuit in wiring from N54 to A26/1.
|
3.3 |
|
Wiring for short to circuit 30 or
open circuit |
9 ![](../../../logos/mb/sockr.gif) |
N54
![](../../../logos/mb/ohmmm.gif)
|
![](../../../logos/mb/sockl.gif) 20
|
Disconnect N54.
Disconnect ground wire from .
|
> 20 k![](../../../logos/other/uomega.gif) |
A26/1,
Open circuit in wiring from N54 to A26/1. |
|
|
|
9 ![](../../../logos/mb/sockr.gif) |
N54
![](../../../logos/mb/ohmmm.gif)
|
![](../../../logos/mb/sockl.gif) 20
|
Remove A26/1. |
> 20 k![](../../../logos/other/uomega.gif) |
Open circuit in wiring from N54 to A26/1.
|
|
|
|
A26/1
2 ![](../../../logos/mb/sockr.gif) |
|
N54
![](../../../logos/mb/sockl.gif) 20
|
|
< 1 ![](../../../logos/other/uomega.gif) |
Open circuit in wiring from N54 to A26/1. |
3.4 |
|
Left front door IR
receiver (A26/1)
Voltage supply |
3 ![](../../../logos/mb/sockr.gif) |
A26/1
![](../../../logos/mb/volmmc.gif)
|
![](../../../logos/mb/sockl.gif) 7
|
Connect N54. |
11 - 14 V |
N54,
Open circuit in wiring from N54 to A26/1.
|
3.5 |
|
Left front door IR
receiver (A26/1)
Signal wire |
27 ![](../../../logos/mb/sockr.gif) |
N54
![](../../../logos/mb/buc35.gif)
|
![](../../../logos/mb/sockl.gif) 18
|
Lock vehicle with IR transmitter at
left front door and keep button depressed.
After completion of the locking process, read value.
Afterwards, release button and read second value.
|
Difference of values between button
depressed and button released approx.
+0.3 - +0.5 V. |
A26/1. |
4.0 |
![](../../../logos/mb/foudg.gif) |
Right front door IR
receiver (A26/2)
Red indicator lamp,
wiring for short to circuit 31 |
27 ![](../../../logos/mb/sockr.gif) |
N54
![](../../../logos/mb/ohmmm.gif)
|
![](../../../logos/mb/sockl.gif) 3
|
Disconnect N54. |
> 20 k![](../../../logos/other/uomega.gif) |
A26/2,
Open circuit in wiring from N54 to A26/2.
|
|
|
|
27 ![](../../../logos/mb/sockr.gif) |
N54
![](../../../logos/mb/ohmmm.gif)
|
![](../../../logos/mb/sockl.gif) 3
|
Remove A26/2. |
> 20 k![](../../../logos/other/uomega.gif) |
Open circuit in wiring from N54 to A26/2.
|
4.1 |
![](../../../logos/mb/sevdg.gif) |
Wiring for short to circuit 30 or
open circuit
|
9 ![](../../../logos/mb/sockr.gif) |
N54
![](../../../logos/mb/ohmmm.gif)
|
![](../../../logos/mb/sockl.gif) 3
|
Disconnect N54.
Disconnect ground wire from .
|
> 20 k![](../../../logos/other/uomega.gif) |
A26/2,
Open circuit in wiring from N54 to A26/2. |
|
|
|
9 ![](../../../logos/mb/sockr.gif) |
N54
![](../../../logos/mb/ohmmm.gif)
|
![](../../../logos/mb/sockl.gif) 3
|
Remove A26/2. |
> 20 k![](../../../logos/other/uomega.gif) |
Open circuit in wiring from N54 to A26/2.
|
|
|
|
A26/2
6 ![](../../../logos/mb/sockr.gif) |
|
N54
![](../../../logos/mb/sockl.gif) 3
|
|
< 1 ![](../../../logos/other/uomega.gif) |
Open circuit in wiring from N54 to A26/2. |
4.2 |
![](../../../logos/mb/fivdg.gif) |
Right front door IR
receiver (A26/2)
Green indicator lamp,
wiring for short to circuit 31 |
27 ![](../../../logos/mb/sockr.gif) |
N54
![](../../../logos/mb/ohmmm.gif)
|
![](../../../logos/mb/sockl.gif) 10
|
Disconnect N54. |
> 20 k![](../../../logos/other/uomega.gif) |
A26/2,
Open circuit in wiring from N54 to A26/2.
|
|
|
|
27 ![](../../../logos/mb/sockr.gif) |
N54
![](../../../logos/mb/ohmmm.gif)
|
![](../../../logos/mb/sockl.gif) 10
|
Remove A26/2. |
> 20 k![](../../../logos/other/uomega.gif) |
Open circuit in wiring from N54 to A26/2.
|
4.3 |
![](../../../logos/mb/eigdg.gif) |
Wiring for short to circuit 30 or
open circuit
|
9 ![](../../../logos/mb/sockr.gif) |
N54
![](../../../logos/mb/ohmmm.gif)
|
![](../../../logos/mb/sockl.gif) 10
|
Disconnect N54.
Disconnect ground wire from .
|
> 20 k![](../../../logos/other/uomega.gif) |
A26/2,
Open circuit in wiring from N54 to A26/2. |
|
|
|
9 ![](../../../logos/mb/sockr.gif) |
N54
![](../../../logos/mb/ohmmm.gif)
|
![](../../../logos/mb/sockl.gif) 10
|
Remove A26/2. |
> 20 k![](../../../logos/other/uomega.gif) |
Open circuit in wiring from N54 to A26/2.
|
|
|
|
A26/2
5 ![](../../../logos/mb/sockr.gif) |
|
N54
![](../../../logos/mb/sockl.gif) 10
|
|
< 1 ![](../../../logos/other/uomega.gif) |
Open circuit in wiring from N54 to A26/2.
|
4.4 |
|
Right front door IR
receiver (A26/2)
Voltage supply |
7 ![](../../../logos/mb/sockr.gif) |
A26/2
![](../../../logos/mb/volmmc.gif)
|
![](../../../logos/mb/sockl.gif) 3
|
Connect N54. |
11 - 14 V |
N54,
Open circuit in wiring from N54 to A26/2.
|
4.5 |
|
Right front door IR
receiver (A26/2)
Signal wire |
27 ![](../../../logos/mb/sockr.gif) |
N54
![](../../../logos/mb/volmmc.gif)
|
![](../../../logos/mb/sockl.gif) 8
|
Lock vehicle with IR transmitter at
right front door and keep button depressed.
After completion of the locking process, read value.
Afterwards, release button and read second value.
|
Difference of values between button
depressed and button released approx.
+0.3 - +0.5 V. |
A26/2. |
5.0 |
![](../../../logos/mb/foudg.gif) |
Trunk lid IR
receiver (A26/3)
Red indicator lamp,
wiring for short to circuit 31 |
27 ![](../../../logos/mb/sockr.gif) |
N54
![](../../../logos/mb/ohmmm.gif)
|
![](../../../logos/mb/sockl.gif) 21
|
Disconnect N54. |
> 20 k![](../../../logos/other/uomega.gif) |
A26/3,
Open circuit in wiring from N54 to A26/3.
|
|
|
|
27 ![](../../../logos/mb/sockr.gif) |
N54
![](../../../logos/mb/ohmmm.gif)
|
![](../../../logos/mb/sockl.gif) 21
|
Remove A26/3. |
> 20 k![](../../../logos/other/uomega.gif) |
Open circuit in wiring from N54 to A26/3.
|
5.1 |
![](../../../logos/mb/sevdg.gif) |
Wiring for short to circuit 30 or
open circuit
|
9 ![](../../../logos/mb/sockr.gif) |
N54
![](../../../logos/mb/ohmmm.gif)
|
![](../../../logos/mb/sockl.gif) 21
|
Disconnect N54.
Disconnect ground wire from .
|
> 20 k![](../../../logos/other/uomega.gif) |
A26/3,
Open circuit in wiring from N54 to A26/3. |
|
|
|
9 ![](../../../logos/mb/sockr.gif) |
N54
![](../../../logos/mb/ohmmm.gif)
|
![](../../../logos/mb/sockl.gif) 21
|
Remove A26/3. |
> 20 k![](../../../logos/other/uomega.gif) |
Open circuit in wiring from N54 to A26/3.
|
|
|
|
A26/3
6 ![](../../../logos/mb/sockr.gif) |
|
N54
![](../../../logos/mb/sockl.gif) 21
|
|
< 1 ![](../../../logos/other/uomega.gif) |
Open circuit in wiring from N54 to A26/3.
|
5.2 |
![](../../../logos/mb/fivdg.gif) |
Trunk lid IR receiver (A26/3)
Green indicator lamp,
wiring for short to circuit 31 |
27 ![](../../../logos/mb/sockr.gif) |
N54
![](../../../logos/mb/ohmmm.gif)
|
![](../../../logos/mb/sockl.gif) 2
|
Disconnect N54. |
> 20 k![](../../../logos/other/uomega.gif) |
A26/3,
Open circuit in wiring from N54 to A26/3.
|
|
|
|
27 ![](../../../logos/mb/sockr.gif) |
N54
![](../../../logos/mb/ohmmm.gif)
|
![](../../../logos/mb/sockl.gif) 2
|
Remove A26/3. |
> 20 k![](../../../logos/other/uomega.gif) |
Open circuit in wiring from N54 to A26/3.
|
5.3 |
![](../../../logos/mb/eigdg.gif) |
Wiring for short to circuit 30 or
open circuit
|
9 ![](../../../logos/mb/sockr.gif) |
N54
![](../../../logos/mb/ohmmm.gif)
|
![](../../../logos/mb/sockl.gif) 2
|
Disconnect N54.
Disconnect ground wire from .
|
> 20 k![](../../../logos/other/uomega.gif) |
A26/3,
Open circuit in wiring from N54 to A26/3. |
|
|
|
9 ![](../../../logos/mb/sockr.gif) |
N54
![](../../../logos/mb/ohmmm.gif)
|
![](../../../logos/mb/sockl.gif) 2
|
Remove A26/3. |
> 20 k![](../../../logos/other/uomega.gif) |
Open circuit in wiring from N54 to A26/3.
|
|
|
|
A26/3
5 ![](../../../logos/mb/sockr.gif) |
|
N54
![](../../../logos/mb/sockl.gif) 2
|
|
< 1 ![](../../../logos/other/uomega.gif) |
Open circuit in wiring from N54 to A26/3. |
5.4 |
|
Trunk lid IR receiver (A26/3)
Voltage supply |
7 ![](../../../logos/mb/sockr.gif) |
A26/3
![](../../../logos/mb/volmmc.gif)
|
![](../../../logos/mb/sockl.gif) 3
|
Connect N54. |
11 - 14 V |
N54,
Open circuit in wiring from N54 to A26/3.
|
5.5 |
|
Trunk lid IR receiver (A26/3)
Signal wire |
27 ![](../../../logos/mb/sockr.gif) |
N54
![](../../../logos/mb/buc35.gif)
|
![](../../../logos/mb/sockl.gif) 4
|
Lock vehicle with IR transmitter at
trunk lid and keep button depressed.
After completion of the locking process, read value.
Afterwards, release button and read second value.
|
Difference of values between button
depressed and button released approx.
+0.3 - +0.5 V. |
A26/3. |
6.0 |
![](../../../logos/mb/nindg.gif) |
ATA/CF microswitch (S86s1, S87s1,
S88s1)
wiring for short to circuit 30 |
9 ![](../../../logos/mb/sockr.gif) |
N54
![](../../../logos/mb/ohmmm.gif)
|
![](../../../logos/mb/sockl.gif) 11
|
Disconnect N54.
Disconnect ground wire from . |
> 20 k![](../../../logos/other/uomega.gif) |
Open circuit in wiring to S86s1, S87s1, S88s1 (vehicles up to 11/93),
M14/1 or M14/2 short to circuit 30,
ATA control module (N26),
CF control module (N57).
|
6.1 |
![](../../../logos/mb/nindg.gif) |
|
9 ![](../../../logos/mb/sockr.gif) |
N54
![](../../../logos/mb/ohmmm.gif)
|
![](../../../logos/mb/sockl.gif) 11
|
Disconnect M14/1 or M14/2.
|
> 20 k![](../../../logos/other/uomega.gif) |
Open circuit in wiring to S86s1, S87s1, S88s1 (vehicles up to 11/93),
ATA control module (N26),
CF control module (N57).
|
6.2 |
![](../../../logos/mb/nindg.gif) |
|
9 ![](../../../logos/mb/sockr.gif) |
N54
![](../../../logos/mb/ohmmm.gif)
|
![](../../../logos/mb/sockl.gif) 11
|
Disconnect N26. |
> 20 k![](../../../logos/other/uomega.gif) |
Open circuit in wiring to S86s1, S87s1, S88s1 (vehicles up to 11/93),
M14/1 or M14/2 short to circuit 30,
ATA control module (N26),
CF control module (N57). |
6.3 |
|
Vehicles up to 11/93 only
Right front door rotary tumbler microswitch (S87s2) |
27 ![](../../../logos/mb/sockr.gif) |
N54
![](../../../logos/mb/ohmmm.gif)
|
![](../../../logos/mb/sockl.gif) 7
|
Close door to first detent.
|
< 1
|
S87s2,
Adjustment.
|
|
|
|
27 ![](../../../logos/mb/sockr.gif) |
N54
![](../../../logos/mb/ohmmm.gif)
|
![](../../../logos/mb/sockl.gif) 7
|
Close door completely.
|
> 20 k![](../../../logos/other/uomega.gif) |
S87s2,
Adjustment.
|
6.4 |
|
Vehicles up to 11/93 only
Rotary tumbler/trunk lid microswitch (S88/1) |
27 ![](../../../logos/mb/sockr.gif) |
N54
![](../../../logos/mb/ohmmm.gif)
|
![](../../../logos/mb/sockl.gif) 26
|
Trunk lid open.
|
< 1
|
S88/1.
|
|
|
|
27 ![](../../../logos/mb/sockr.gif) |
N54
![](../../../logos/mb/ohmmm.gif)
|
![](../../../logos/mb/sockl.gif) 26
|
Trunk lid closed.
|
> 20 k![](../../../logos/other/uomega.gif) |
S88/1.
|
7.0 |
![](../../../logos/mb/uidg.gif) ![](../../../logos/mb/zerdg.gif) |
Vehicles up to 11/93 only
Ignition/starter
switch (S2/1), Interior/taillamp harness connector (X18/3), Taillamp
harness connector (X18/9)
Wiring for open circuit
|
27 ![](../../../logos/mb/sockr.gif) |
N54
![](../../../logos/mb/ohmmm.gif)
|
![](../../../logos/mb/sockl.gif) 16
|
Disconnect N54.
Remove key from ignition.
|
< 1
|
S2/1,
X18/3 open circuit,
X18/9 open circuit,
Open circuit, wire:
from S2/1 to X18/3,
from S2/1 to W1,
from N54 to X18/9,
from M14/1 to X18/9,
from M14/1 to X18/3.
|
7.1 |
![](../../../logos/mb/uidg.gif) ![](../../../logos/mb/uidg.gif) |
Vehicles up to 11/93 only
Wiring for short to circuit 31 |
27 ![](../../../logos/mb/sockr.gif) |
N54
![](../../../logos/mb/ohmmm.gif)
|
![](../../../logos/mb/sockl.gif) 16
|
Ignition key in position "1".
|
> 20 k
|
S2/1,
X18/3 open circuit,
X18/9 open circuit,
Open circuit, wire:
from S2/1 to X18/3,
from S2/1 to W1,
from N54 to X18/9,
from M14/1 to X18/9,
from M14/1 to X18/3.
|
8.0 |
![](../../../logos/mb/uidg.gif) ![](../../../logos/mb/twodg.gif) |
Actuation of left front door actuator
(S47) |
27 ![](../../../logos/mb/sockr.gif) |
N54
![](../../../logos/mb/volmmc.gif)
|
![](../../../logos/mb/sockl.gif) 6
|
Unlock the driver's door. |
11 - 14 V |
Open circuit in:
Connector X18/9,
Wire from N54 to X18/9,
Wire from M14/1 to X18/9.
|
9.0 |
![](../../../logos/mb/uidg.gif) ![](../../../logos/mb/thrdg.gif) |
Vehicles up to 11/93 only
Actuation of right front door actuator (S48) |
27 ![](../../../logos/mb/sockr.gif) |
N54
![](../../../logos/mb/volmmc.gif)
|
![](../../../logos/mb/sockl.gif) 17
|
Unlock the passenger door.
|
11 - 14 V
|
Open circuit in:
Connector X18/9,
Wire from N54 to X18/9,
Wire from M14/1 to X18/9.
|
10.0 |
![](../../../logos/mb/uidg.gif) ![](../../../logos/mb/foudg.gif) |
Vehicles up to 11/93 only
Actuation of trunk lid lock actuator (S49)
|
27 ![](../../../logos/mb/sockr.gif) |
N54
![](../../../logos/mb/volmmc.gif)
|
![](../../../logos/mb/sockl.gif) 25
|
Unlock the trunk. |
11 - 14 V |
Open circuit in:
Connector X18/9,
Wire from N54 to X18/9,
Wire from M14/1 to X18/9.
|
11.0 |
![](../../../logos/mb/uidg.gif) ![](../../../logos/mb/fivdg.gif) |
Vehicles as of 12/93 only
Immobilization output
|
27 ![](../../../logos/mb/sockr.gif) |
N54
![](../../../logos/mb/volmmc.gif)
|
![](../../../logos/mb/sockl.gif) 9
|
Unlock vehicle by pointing IR transmitter
toward one of the three IR receivers.
Open driver's window.
Lock vehicle by pointing IRCL transmitter toward one of the three IR receivers.
Ignition: ON
|
11 - 14 V
< 1 V |
Wiring,
1.0, 3.0 - 5.0,
N54. |