Mercedes-Benz ML320. Manual — part 369

GF54.30-P-3028GH

Displaying coolant level, function

28.6.99

MODEL

163 as of 1.3.99

Function prerequisite
Engine: ON

Function
If the coolant level drops below the minimum mark the low ECL
indicator lamp (A1p11) is illuminated.

To record the coolant level the instrument cluster (A1) is connected
direct to the coolant level indicator electronic switch (S41) via two
cables. The coolant level indicator electronic switch (S41)
consists of two electrodes.
D

If the level is correct both electrodes are immersed in the
coolant. The coolant serves as a dielectric between the
electrodes.

D

If the coolant level is below the minimum mark the electrodes of
the sensor are no longer immersed in the coolant. There is only
air between the electrodes as a dielectric.

Evaluation

The instrument cluster (A1) sends test pulses to the sensor for
a period of one millisecond. These pulses are deformed
differently depending on the dielectric (air or coolant).
The instrument cluster (A1) evaluates the pulse shape and, if
the coolant level is below the minimum (electrodes are
completely in air), actuates the low ECL indicator lamp (A1p11)
after a delay of approx. 60 seconds.

The delay serves to prevent the indicator lamp flickering due to
the coolant moving from side to side on corners or off-road.

Diagnosis
Diagnosis is carried out, as described in the Diagnosis Manual, via
the simulation of the coolant level indicator electronic switch (S41)
by a resistance.

Coolant level switch,
location/task/design/function

GF54.30-P-4103GH

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GF00.20-P-2010B

Displaying service, function

25.3.99

MODEL

129 as of 1.8.99

MODEL

163 as of 1.1.00

MODEL

168 as of 1.9.99

MODEL

170 as of 1.12.99

MODEL

202 as of 1.8.99

Display of service to be performed
In addition to the various service displays, the service work to be
performed (A or B) also appears.
The service symbol (wrench) appears once or twice in the display for
this purpose.

The service symbol appears

D

once for service A

D

twice for service B.

A service A is always followed by a service B.
Following a service B, the next service must be calculated
taking into account the kilometer readings. If the distance of the
current service interval is less than 22 000 km, the next service
is service A, otherwise service B.
This calculation is now performed automatically in the
instrument cluster (A1).
The path of the service displayed A or B can be processed in
the service sheet without the need for a calculation.

There is no external difference in the instrument clusters with
and without the service display.
If service A (one service symbol) is displayed, it is then
necessary to ensure by means of the production date or the
control unit identifier, that the vehicle in question is in fact a
vehicle with service display. If this is not the case, the service
must be determined as specified in the service sheet.

The table below shows from which control unit identifier the
instrument cluster features the service display:

The control unit identifier can be read with the HHT under menu point
"Control unit version".

Model

Control unit identifier

129

2/04

163

3/04

168

3/20

170

2/23

202

0/20

Displaying remaining service function

GF00.20-P-2007A

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AR82.20-P-0110GH

Removing and installing front dome lamp

13.3.97

MODEL

163

P82.20-0400-11

1

Overhead control panel

2

Bulb

3

Socket

4

Dome lamp switch

5

Screws

6

Reflector housing

Removal, installation

1

Remove overhead control panel (1)

AR82.20-P-1100GH

2

Remove bulb (2)

3

Release socket (3) for bulb (2) by pressing in

The bulb socket is clipped to the overhead

control panel.

4

Pull dome lamp switch (4) off of reflector
housing (6)

5

Unscrew screws (5) from reflector housing (6)
on left and right on overhead control panel (1)

6

Pry reflector housing (6) out of overhead
control panel (1)

Avoid damaging reflector housing

7

Reinstall in opposite order

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AR72.10-P-2100GH

Remove/install door catch

11.2.97

MODEL

163.113 /128 /136 /154 /157 /172 /174 /175

P72.10-0483-01

1

Bolt

2

Mount for seal

3

Seal

4

Bracket

5

Door retaining strap

6

Nut

P72.10-0484-01

Removing, installing

1

Remove door lining

Front door

AR72.10-P-1000GH

Rear door

AR72.12-P-1010GH

2

Pull foil off of inner door panel in front area

Installation: Replace damaged foil.

3

Unscrew screw (1) on door retraining strap

Avoid damaging paint.

Installation: Apply glue to screw.

*BR00.45-Z-1013-02A

*BA72.10-P-1001-01D

*BA72.12-P-1003-01C

4.1

Pull seal (3) off of door retaining strap (5)

Up to 08/99.

5

Close crank window

6

Unscrew nuts (6) from door retaining strap

Hold door retaining strap to prevent it

from falling into the door

*BA72.10-P-1002-01D

7

Remove door retaining strap through
installation opening in inner door panel

Pull rubber out of retaining clip at bottom

of window guide rail and move along door
catch.

Installation: Install window guide rail

correctly.

8

Install in the reverse order

Front door

Number

Designation

MODEL
Series 163

BA72.10-P-1001-01D

Bolt, door catch at A-pillar

Nm

24

BA72.10-P-1002-01D

Nut for door restraining strap on
inside of door

Nm

10

Rear door

Number

Designation

MODEL
Series 163

BA72.12-P-1003-01C

Screw for door catch on B-pillar

Nm

24

Auxiliary repair materials

Number

Designation

Order number

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