1997 MERCEDES-BENZ ML320 service indicator

GF54.30-P-3015A
Liquid crystal display (LCD), location/task/function
7.7.99

MODEL
129, 140 as of 1.6.96,

163, 168, 170,

202 as of 1.8.96,

208,

210 as of 1.6.96,

215, 220

P54.30-0523-06

Task

The liquid crystal displays (LCDs) can display

numbers, letters and other symbols. They are

therefore used as the output devices of

electronic systems. They are increasingly

used as a replacement for the conventional

analog indicating instruments and indicator

lamps.

Operating principle

The operating principle of the liquid crystal
display is explained using a seven-segment

display as an example (see illustration).

A spacer frame (d) which surrounds a thin

layer of liquid crystal (e) is sandwiched

between the glass plates (a) and (f).

Transparent electrodes (segments) are

attached to glass plate (a) in the shape of the

desired characters.

The transparent counter-electrode (h) is on glass plate (f). If a

voltage is applied between the contact (g) of the counter-electrode

(h) and one or more contacts (b) of the segmented electrodes (c), the

optical properties of the liquid crystal between the counter-electrode

(h) and the energized electrodes (c) change. If the LCD is viewed in

the direction of the arrow, the energized electrodes (c) appear dark

and are thus visible. By actuating the appropriate electrodes (c) it is

possible to display any number.

The liquid crystal display also has 2 polarization filters (i). These

types of display have a better contrast and require a lower supply

voltage (approx. 1.5 - 5 V).
Other characters can also be displayed if the appropriate electrode

layout or shape is selected. Strip-type electrodes are usually used in

the multifunction display (A1p13). Here strip-type electrodes are

attached to both of the glass plates (a) and (f). The strips on glass

plate (a) are arranged vertically to the strips on glass plate (f). This

arrangement allows individual dots (pixels) to be actuated. If different

dots are actuated repeatedly in sequence at a sufficiently high speed

, it is possible to produce almost any "image".

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GF54.30-P-4104A
Outside temperature display, location/function
8.7.99

MODEL
129

MODEL
140 as of 1.6.96

MODEL
170

MODEL
163, 202 with CODE (240a) Outside temperature display

MODEL
202 as of 1.8.96

MODEL
168

MODEL
208 up to 31.7.99,

210 as of 1.6.96 up to 30.6.99

To display the temperature, the
outside temperature indicator

A1p4
requires:

D
the outside temperature

D
the speed signal

D
the engine running time

and
D
the coolant temperature (model 129, and model 140 as of
1.6.96, model 170, model 202 as of 08/96 and model 163,

model 168, model 210)

The outside temperature is determined by the outside temperature

indicator temperature sensor B14. The temperature sensor is

installed at the front left of the vehicle under the bumper and

connected to the instrument cluster A1 via the 21 or 25-pin

connector, coding part A terminal 1 and 2.

The speed signal, engine running time and engine temperature are

determined internally by the instrument cluster A1.

Since the outside temperature display depends on the speed, engine

running time and coolant temperature, high temperatures (influenced

by the heat generated by the engine, for example) are not displayed

when the vehicle is stationary or moving slowly.
Function, model 202 until 08/95

When the ignition is switched on and off and at speeds below approx.

20 km/h, the last temperature measured is stored and displayed.

If the measured outside temperature drops below the stored value,

the current measured temperature is displayed.

If the outside temperature rises above the stored value, the current

measured outside temperature is displayed only after the following

delays:

D
When the engine is not running, the current outside

temperature is only displayed after 6 times the engine running

time. For example, if the preceding running time was 5 minutes,

the current temperature is not displayed until after 30 minutes.
The maximum delay, however, is 1 hour.

Up to 09.94

D
At vehicle speeds between 20-60 km/h, outside temperatures

are displayed after a delay of approx. 5 min.

D
At vehicle speeds over 60 km/h, outside temperatures are

displayed after a delay of approx. 2 minutes.

As of 09.94

D
At vehicle speeds between 20-45 km/h, outside temperatures

are displayed after a delay of approx. 3 min.

D
At vehicle speeds over 45 km/h, outside temperatures are

displayed after a delay of approx. 1.5 min.

Function

Model 129, model 140 as of 1.6.96, model 170, model 202 as of

08/96, model 163, model 168, model 208 and model 210

D
When the ignition is turned on or off

and with an engine temperature < 60°C

the current temperature is always stored and displayed.

D
When the ignition is turned off

and with an engine temperature < 60°C

the temperature last measured is stored and displayed.

D
When the ignition is turned on

and when an engine temperature < 60(C

The stored temperature is displayed.
If the measured outside temperature drops below the stored value,

the current measured temperature is displayed.

If the outside temperature rises above the stored value, the current

measured outside temperature is displayed only after the following

delays:

D
When the engine is not running, the current outside

temperature is only displayed after 6 times the engine running

time. For example, if the preceding running time was 5 minutes,

the current temperature is not displayed until after 30 minutes.
The maximum delay, however, is 1 hour.

D
At vehicle speeds between 20-45 km/h, outside temperatures

are displayed after a delay of approx. 3 minutes.

D
At vehicle speeds above 45 km/h, outside temperatures are

displayed after a delay of approx. 1.5 minutes.

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Page 1

SI91.60-P-0002A
Service information on immobilization of a passenger-side airbag where a

rearward mounted (reboard) child seat is fitted
17.3.99

MODEL
124, 126, 129, 140, 163, 168, 170, 202, 203, 208, 210, 215, 220, 463

Modification notes

18.11.00

Supersedes Service Information SI91.60-P-0002A dated

15.11.00
Remove the SI SI91.60-P-0002A from your file

It is recommended to place the child seat in the rear area if

possible.

If, in exceptional cases, the owner wishes a rearward mounted child
seat to be expressly attached on the front passenger seat, the front

passenger airbag should be immobilized.


As a general rule, there is no approval for immobilizing the front

passenger airbag on models fitted with ACSR, which is visible from

the "airbag OFF" indicator light in the center console. On such

models, an MB child seat with ACSR should be used for safety and

cost reasons.

-----------------------------------------------------------------------------------------


On models fitted with seat belt force limiter, it is essential for

safety reasons to

D
program the front passenger ETR to "NO".

D
unplug the connector at the front passenger ETR.


No provision is made for immobilizing the seat occupied

recognition, the automatic child seat recognition (ACSR), as well as

the side airbag and window airbag.

In the event that it is necessary to immobilize the seat occupied

recognition and automatic child seat recognition (ACSR), for example

if a Recaro seat is installed, this can be carried out in exceptional

cases after agreement has been obtained from GSP/SPS, tel. 07031

/ 90 - 81815.

-----------------------------------------------------------------------------------------


After immobilizing the front passenger airbag or additionally the

ETR, it is essential to

D
have the customer sign the confirmation after immobilization.

D
affix a sticker at a clearly visible point in the area of the front

passenger airbag.

D
affix a sticker in the Owner's Manual, in the section Airbag.

Carry out the remaining procedure as stated below.

-----------------------------------------------------------------------------------------
Deactivation can be reversed at any time.

Immobilization and re-activation must be entered in the

vehicle documents!

The vehicle should be presented in such a case to a technical

inspection center (DEKRA, TÜV). The completed confirmation

should be submitted to the vehicle registration authorities for

entry.

-----------------------------------------------------------------------------------------

Perform version coding / procedure
Model

Version
Coding with HHT
2)

or STAR Diagnosis tool (DAS)
Unplug

connector of

passenger side

airbag
3)

Unplug

connector of

passenger side

emergency
tensioning
retractor
Insert

replacement resistor
3)

Passenger-side

airbag
NO

Passenger side
emergency
tensioning

retractor NO

124
All
--X-X

126
All
--X-X

129
up to 06/93
--X-X

129
as of 07/93 without ACSR
X-X--

140
up to 06/93
--X-X

140
as of 07/93 without ACSR
X-X--

140
as of 07/93 with ACSR
1)
-----

163
up to VIN 145263
--X-X

163
as of VIN 145264
-----

168
All
-----

170
without ACSR
XXXX-

170
with ACSR
1)
-----

202
without seat belt force limiter
X-X--

202
as of 06/97
4)
XXXX-

202
with ACSR
1)
-----

203
All
-----

208
All
-----

210
without ACSR
XXXX-

210
with ACSR
1)
-----

215
All
-----

220
All
-----

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Page 1

SI18.00-P-0010A
Service Information: oil sludge
26.3.01

ENGINE
111 in MODELS 124, 163, 170, 202, 203, 208, 210

ENGINE
112 in MODELS 129, 163, 170, 202, 203, 208, 210, 220

ENGINE
112, 113 in MODEL 463

ENGINE
113 in MODELS 129, 163, 202, 208, 210, 215, 220

ENGINE
137 in MODEL 215, 220

ENGINE
166 in MODEL 168

Oil sludging in gasoline engines with ASSYST maintenance

system

Recently we have determined that time and time again oil

sludging occurs in gasoline engines with an ASSYST maintenance

system.

Oil sludging can lead to the following complaints:
D
engine oil consumption

D
engine smoke (white/blue)

D
influencing of oil level indicator

D
clogged oil filter, engine oil thickened like jelly

D
Check engine lamp illuminated

D
oil sludge visible during assembly job, e.g. in oil filter, in cylinder

head covers, condensation sludging
(engine 166) etc.

-----------------------------------------------------------------------------------------
The following list of causes may lead individually or as a combination
to engine oil sludging:

D
Crankcase ventilation inoperable, function orifices, bores,

passages in cylinder head cover, cylinder head, crankcase etc.

are mechanically sealed. A nonfunctioning crankcase

ventilation boosts loads on the engine oil through organic

nitrates. The risk of oil sludging increases.

The mechanical condition of the engine is always to be

checked, i.e. all engine oil drain orifices on the cylinder head

and crankcase and all crankcase ventilation ducts must be free

of obstacles. Crankcase breather lines may not be kinked.
Check the ventilation bores in the cylinder head covers.

-----------------------------------------------------------------------------------------

D
The engine oil used does not comply with the specifications in

Sheet 229.1 or 229.3 of the Specifications for Service Products.

The additive process, e.g. dirt-carrying capability, neutralization

capability and oxidation resistance as well as the quality of the

base stock influence sludging time.

Use of engine oils with best possible resistance to formation of

sludge, i.e. use only tested and approved engine oils (from

Sheet 229.1 or 229.3). The best protection is afforded by the

engine oils on Sheet 229.3, which fulfill more stringent

specifications with regard to preventing sludge and deposits
(see Sheet 221.0, page 11). These oils have a distinctly better

anti-sludge characteristic than other engine oils.

D
Sludging after adding a fuel or engine oil special additive.

Do not use fuel or engine oil special additives. More information

hereto is available on Sheet 219.0 of the Specifications for

Service products. Reference to customer not to use special

additives.

D
Engine oil change not performed according to ASSYST

specifications. At driven distances

exceeding > approx. 3000 km, engine oil sludging may occur.

-----------------------------------------------------------------------------------------
Comply with engine oil and filter change as under ASSYST

specifications. Observe remaining distance.

D
Fuel grade lies outside standard (regionally contingent). If

contaminated, deficient fuel is used, then engine oil sludging

may occur even where approved engine oil is used.

Operation with fuel, e.g. as under DIN EN 228. Clarify refueling

behavior of customer. If engine operation regional, is

temporarily possible with deficient oil only, then the startup

distance has to be individually reduced, i.e. the oil change

temporarily performed at an interval of, e.g. 10,000 km.

D
Radiator antifreeze penetration into engine oil, e.g. through an

internal engine leak (cylinder head gasket, casting porosity).

The engine oil sludges within a short period. The crankcase

ventilation clogs up and stops functioning. Condensation

sludging clogs up the oil separator cells

(engine 166).
Rectify coolant leakage. Clean all sludged engine parts, in

particular the crankcase ventilation parts. If the occurrence

repeats, and casting porosity is suspected, e.g. replace

crankcase.

-----------------------------------------------------------------------------------------

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Page 1

5
Remove key and engage steering lock

6
Unscrew bolt (32c)

Hold the steering wheel (32).


Installation:
Replace bolt (32c).


*BA46.10-P-1001-02A

7
Pull off steering wheel (32)

Pass cables carefully through the openings.


Installation:
Align recesses of the splines

in the steering wheel with the markings on the

steering shaft (arrows).

8
Check fanfare horns and airbag clock spring

contact (A45) for damage

The clock spring contact must not be

turned while the steering wheel is removed

otherwise it will be damaged.

Visual inspection, replace clock spring

contact if necessary:

#

Removing and installing clock spring contact

AR46.10-P-0200GH

9
Install in the reverse order

10
Carry out road test

Tests during the road test:

Turn signal canceling:

When the steering wheel is offset by

more than 1 tooth, satisfactory resetting of the

turn signal is no longer guaranteed.

Airbag indicator lamp:

The SRS indicator lamp must not light up

on full steering lock in both directions.

Steering wheel position:

If the steering wheel is crooked, adjust it

by max. 1 tooth. If the difference is greater:

#

Check toe on front axle and adjust if

necessary, see:

#

Performing chassis alignment check

AR40.20-P-0200A

Steering wheel

Number

Designation
Model 163

BA46.10-P-1001-02A
Bolt, steering wheel to steering shaft
Nm
80

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Page 2

AD54.30-P-5000-03A
Directly controlled display instruments

troubleshooting chart IC

Directly controlled display instruments or indicator

lamp/warning message:

D
Outside temperature indicator

D
Fuel gauge

D
Oil pressure gauge (models 129 and 140 only)

D
Left turn signal indicator lamp

D
Right turn signal indicator lamp

D
High beam indicator lamp

D
Fuel reserve indicator lamp

D
Airbag SRS indicator lamp/MIL

D
AIRBAG OFF indicator lamp (only model 163 except

I )
D
Low brake fluid level/parking brake indicator lamp (only brake

fluid direct)

(both functions via CAN on model 163)

D
Low windshield washer fluid level indicator lamp (except

models 163 and 168)
D

Low ECL indicator lamp (except models 163 and 168)

D
Generator charge indicator lamp

D
Seat belt reminder lamp

D
Seat belt/backrest lock reminder lamp

D
Exterior lamp failure indicator lamp

D
Hydraulic fluid level indicator lamp (models 202 and 210 only)

D
ADS MIL, suspension

D
Turn signal clicking

D
Seat belt reminder lamp

D
Light reminder lamp

D
Key reminder lamp

D
Soft top reminder lamp (model 170 only)

D
Steering lock warning lamp (

I )

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Page 1

AD54.30-P-5000-02A
Display instruments controlled via CAN

troubleshooting chart IC

The following display instruments or indicator lamps/ malfunction

indicator lamps receive their information from the traction system

control module (N47) via CAN data buses (an appropriate message

appears in the display on vehicles with multi-function display):

D
Total mileage recorder, trip odometer

D
Electronic speedometer

D
Low brake fluid level/parking brake indicator lamp (except model 163

parking brake indicator lamp only via CAN)

D
Brake pad wear indicator lamp

D
ABS MIL

D
ETS, ASR, ESP indicator lamp

D
ETS, ASR, ESP malfunction indicator lamp

Model 163 only:

The
"Low-Range"
indicator lamp receives its information from the

transfer case control module (N78) via CAN data buses.

The
"Fog lamps"
indicator lamp (only model 163 except

I
) receives

its information from the All-activity module (AAM, N10) via CAN data

buses.

Model 168 only:

The
" Gear indicator "
indicator lamp receives its information from the

gear recognition module (A61) or from automatic clutch control module

(N15/4) via CAN data buses.
The following display instruments or indicator lamps/

malfunction indicator lamps receive their information from the

injection system control module (N3) via CAN data buses (an

appropriate message appears in the display on vehicles with

multi-function display):

D
Tachometer

D
Low engine oil level lamp

D
Engine coolant temperature

D
Preglow indicator lamp (diesel only)

D
Vehicle speed warning

D
Vehicle speed limit warning

D
Severe leak warning (

I
only), the fuel reserve indicator lamp

(A1e4) flashes

D
Active Service System (ASSYST):

D
Oil condition

D
Oil level

D
Oil temperature

D
Mass volumetric efficiency (load moment)

D
Engine speed, engine coolant temperature

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Page 1

AR40.15-P-0080A
Remove/install wheel sensor
1.4.99

MODELS
210.074 /274 with CODE (475) Tire pressure indicator

MODELS
211 with CODE (475) Tire pressure indicator

MODELS
215 with CODE (475) Tire pressure indicator

MODELS
220 with CODE (475) Tire pressure indicator

MODELS
230 with CODE (475) Tire pressure indicator

MODELS
240 with CODE (475) Tire pressure indicator

P40.15-2077-06

1
Union nut

2
Spacer ring (2x45°)

3
Valve body

4
Pin

4
2 mm

5
Screw

a
Date of manufacture

b
Identcode

A69/1
Left front TPM [RDK] wheel sensor

A69/2
Right front TPM [RDK] wheel

sensor

A69/3
Left rear TPM [RDK] wheel sensor

A69/4
Right rear TPM [RDK] wheel sensor

A69/5
Spare wheel TPM wheel sensor


Remove

1
Detach tires

AR40.10-P-1030A

2
Unscrew union nut (1) and remove spacer

ring (2

B
45 °)

Counterhold valve body (3) using

installation tool for tire pressure monitor or pin

4
2 mm (4) in drill hole (arrow).


Installation tool for tire pressure monitor

*WH58.30-Z-1040-06A

3
Remove TPM wheel sensor
Left front tire pressure monitor wheel

sensor (A69/1), right front tire pressure

monitor wheel sensor (A69/2), left rear tire

pressure monitor wheel sensor (A69/3), right

rear tire pressure monitor wheel sensor (A69/4)

4
Unscrew bolt (5) and remove valve body (3).


Check

5
Carry out visual inspection

Do not remove the white filter surface on

the underside of the TPM wheel sensor. Do

not clean TPM wheel sensor with compressed

air, solvents, or detergents. Wipe off dirt with

a clean, lint-free cloth only.


Install new TPM wheel sensor if:

D
The white filter surface of the TPM wheel

sensor is damaged or dirty

D
Tire sealant was used

D
Damage can be seen

D
The TPM wheel sensor is more than 5

years old according to the date of

manufacture (a).


Install


Replace all valve parts.

Observe different valve versions.

6
Insert bolt (5) through the hole in the TPM

wheel sensor and screw on valve body (3)

approx. 3 turns.

When replacing the TPM wheel sensor,

pay attention to the correct transmission
frequency (433 MHZ or 315 MHZ).

7
Insert valve body (3) with TPM wheel sensor

into wheel rim so that the radial bore (arrow)

for countering points upwards.

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Page 1