1997 MERCEDES-BENZ ML500 instrument cluster

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.

Copyright DaimlerChrysler AG 05.06.2006 CD-Ausgabe G/10/04 . This WIS print-out will not be recorde
d by Modification services.
Page 1

Fig. 1: Disconnecting Negative Battery Cable
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
BASIC PROGRAMMING
1. Code radio. See Coding radio .
2. Set time on instrument cluster. Pull out knob at lowe r right of speedometer. To adjust hour, turn to right.
To adjust minute, turn to left.
3. If necessary, set time at stationary heater timer. See owner's manual.
4. Start engine and run at idle. Turn steering wheel fr om one lock position to the other to activate steering
angle sensor. Center steering wheel. Ma lfunction indicator lamp should go out.
5. If equipped, normalize ti lting/sliding roof. Open sunroof and hold down switch. Sunroof moves to end
position and pulls back 1/4 turn and stops. If equipped with lemella slidin
g roof, close roof and keep

2001 Mercedes-Benz ML320
2001-04 STARTING & CHARGING SYSTEMS Starters - 163 Chassis
me
Saturday, October 02, 2010 3:19:47 PMPage 3 © 2006 Mitchell Repair Information Company, LLC.

GF54.30-P-3009A
Stepper motor, location/design/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

P54.30-0521-06

General

Stepper motors are motors which, like most

electric motors, consist of a fixed stator and a

moveable rotor. The rotary motion is not

continuous, rather the rotor turns in steps, a

certain angle at a time, for example 90°.

Design

The illustration shows the basic design of a
stepper motor with 1 pole pair and 2 phases.

The stator is made of magnetically soft iron

and holds the windings. Opposite windings

belong together and form a phase (in this

case, a and b). The rotor consists of a

permanent magnet. In the illustration the rotor

has 1 pole pair.

Function

The rotor is turned by applying current

through phase aor b (see illustration). The

magnetism in the stator changes according to

the polarization (I) of the phases.

The rotor will turn so that its south pole (S) is at the north pole (N) of

the stator and its north pole (N) is at the south pole (S) of the stator.

The illustration shows a full rotation of the rotor. The rotor moves in

steps of 90° from positions 1 through 4 and back to its starting

position.

Unlike normal electric motors, the motor can stop in each of these

positions with a certain holding torque. This type of motor is therefore
particularly suitable for use as a servomotor for exact positioning.
The size of the steps can be reduced considerably by increasing the

number of pole pairs and phases.

Theoretically, it is even possible to make the steps infinitely small

with just a few poles and phases by using complicated electronic

phase control (sine-cosine control).

Stepper motors (with sine-cosine control) are used, for example, for

pointing instruments in the instrument cluster (A1).

Copyright DaimlerChrysler AG 04.06.2006 CD-Ausgabe G/10/04 . This WIS print-out will not be recorde
d by Modification services.
Page 1

AD54.30-P-3000-02A
Warning buzzer function check IC

Warning buzzer
D
Light reminder and parking brake reminder

D
Key reminder

I
D
Seat belt reminder

for approx. 6 s

I
,
M
,
H
and Korea

for approx. 12 s

G

The warning tone is interrupted as soon as the seat belt buckle is

inserted.

D
Warning tone for a shortage of oil

D
Vehicle speed warning

G
> 120 km/h, v-limit warning (cruise

control)

D
In addition the symbol for vehicle speed warning appears in the
instrument cluster with multi-function display.
D

On model 163 a warning tone sounds for approx. 5 seconds if the

CAN signal is unusable.

D
Model 168 with automatic clutch system features an audible gear

warning.

It sounds if a gear is engaged at the same time as the driver's

door is opened. Brake and accelerator pedal must not be

operated.

Copyright DaimlerChrysler AG 05.06.2006 CD-Ausgabe G/10/04 . This WIS print-out will not be recorde
d by Modification services.
Page 1

Fig. 30: Horn Circuit
INSTRUMENT CLUSTER

2001 Mercedes-Benz ML320
2001 SYSTEM WIRING DIAGRAMS Mercedes-Benz - ML320
me
Saturday, October 02, 2010 3:27:59 PMPage 61 © 2006 Mitchell Repair Information Company, LLC.

Fig. 31: Instrument Cluster Circuit

2001 Mercedes-Benz ML320
2001 SYSTEM WIRING DIAGRAMS Mercedes-Benz - ML320
me
Saturday, October 02, 2010 3:27:59 PMPage 63 © 2006 Mitchell Repair Information Company, LLC.