key battery MERCEDES-BENZ ML320 1997 Complete Workshop Manual

REST BUTTON, FUNCTION - GF83.40-P-2109-01GI
Function
Pressing the reset button ( ) on the AAC push-button control module (N22) switches on the residual engine
heat utilization system. When the engine is switched off, the residual heat heats the vehicle depending on the
temperature setting on the AAC push-button control panel (N22) and the ambient temperature in the vehicle
interior. The vehicle can be heated for approx. 30 min, with the engine switched off. The function is only
available with the ignition switched off or in position 1. If there is low voltage, the residual heat function is
automatically switched off.
The flaps are in automatic mode and the quantity of air is also automatically regulated.
The residual heat function is switched off,
if the electronic key is moved to position 2 in the starter switch,
after approx. 30 minutes,
if the battery voltage drops below 11V.
AUXILIARY FAN, FUNCTION - GF83.40-P-2115-01GH
Function
Depending on the refrigerant pressure and/or the coolant temperature the left auxiliary fan (M4m1), right
auxiliary fan (M4m2) are actuated.
The all-activity module (AAM) (N10) receives the coolant temperature from the coolant temperature sensor and
the refrigerant pressure from the refrigerant pressure sensor (B12).
The all-activity module (AAM) (N10) compares this input information with stored values and actuates the left
auxiliary fan (M4m1), right auxiliary fan (M4m2).
When the following values are indicated the left auxiliary fan (M4m1), right auxiliary fan (M4m2) are switched
on or off:
refrigerant pressure >16 bar = auxiliary fan ON
refrigerant pressure < 12 bar = auxiliary fan OFF
coolant temperature > 105°C = auxiliary fan ON
coolant temperature < 94°C = auxiliary fan OFF
AUXILIARY FAN, FUNCTION - GF83.40-P-2115-01GI
Function
Depending on the refrigerant pressure and/or the coolant temperature the left auxiliary fan (M4m1) and the right
auxiliary fan (M4m2) are actuated.

2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:16 PMPage 97 © 2006 Mitchell Repair Information Company, LLC.

OFF . To this end the system uses the residual heat of the engine. The residual engine heat is dissipated to the
coolant and routed through the heat exchanger with the aid of the heating water circulation pump. The air drawn
in by the blower motor is routed around the heat exchanger, whereby it is then warmed up. The heated air is
then routed over the air outlets into the passenger compartment.
The residual engine heat utilization system can only be used when the ignition is switched OFF.
Once the Rest push-button ( ) on the AAC push-button control module (N22) has been pressed the
following program sequence is run:
Blending air flaps are automatically controlled
Heating water circulation pump ON
The blower's control voltage is limited to a maximum value of 5 Volt.
End of program
Pressing the Rest push-button ( )
Timeout of 30 minutes period (repeated operation possible)
Protection against undervoltage at a battery voltage of less than 11 V (LED flashes)
Ignition ON
During the residual engine heat utilization function no function keys are accepted apart from the Rest push-
button ( ) and the set point adjusters.
SAFETY PRECAUTIONS
RISK OF EXPLOSION CAUSED BY WELDING OR SOLDERING WORK ON CLOSED AIR CONDITIONING SYSTEM.
RISK OF POISONING CAUSED BY INHALING OVERHEATED REFRIGERANT VAPORS. RISK OF INJURY TO SKIN AND
EYES CAUSED BY CONTACT WITH LIQUID REFRIGERANT. - AS83.00-Z-0001-01A
Never perform welding work on or near a closed air conditioning system. No smoking or open flames.
Wear safety glasses and protective gloves. Work only in well ventilated areas. Carry out repair work on
the air conditioning system circuit only after the system has been discharged.
Potential risks
Risk of explosion
When closed air conditionin
g systems (charged or empty) become heated, high pressures are produced that can
Rest push-button, location/task/function GF83.40-P-2148GI
Heating water circulation pump, location/task/ function GF83.20-P-2109GI
Heating system heat exchanger, location/ purpose/function GF83.20-P-2108GC
Blower motor, location/task/design/function GF83.10-P-2170GI
Blending air flap actuator, location/task/function GF83.57-P-2112GI

2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:17 PMPage 153 © 2006 Mitchell Repair Information Company, LLC.

MODEL 129, 163, 170, 202, 208, 210 as of 1.6.98,215, 220 with CODE (231a) Garage door opener
GARAGE DOOR OPENER DIAGNOSIS, FUNCTION CHECK - AD68.05-P-3000A
MODEL 129, 163, 170, 202, 208, 210 as of 1.6.98,215, 220 with CODE (231a) Garage door opener
GARAGE DOOR OPENER DIAGNOSIS, TROUBLE-SHOOTING - AD68.05-P-5000A
MODELS 129, 163, 170, 202, 208, 210 as of 1.6.98,215, 220 with CODE (231a) Garage door opener
Garage door opener locationModels 129, 202, 208, 210, 215, 220GF68.05-P-1100-01A
Model 170GF68.05-P-1100-01B
Model 163GF68.05-P-1100-01C
Electrical wiring diagramsModel 163PE68.00-P-1100D
Model 170PE68.00-P-1100C
Models 202, 208PE68.00-P-1100B
Model 210PE68.00-P-1100A
Model 220PE68.00-P-1100SA
Model 129, volume 2, FG 68
Connection and use of test equipment AD00.00-P-1000AZ
Diagnostic tools, garage door opener AD68.05-P-2000-01A
Compatibility test for garage door opener AD68.05-P-2000-02A
Garage door opener diagnosis, previous knowledge AD68.05-P-
2000A
Key to diagnostic symbols AD00.00-P-
2001A

Fuses in order
Battery voltage 11-14V
Ignition: ON

Function check
Scope of test Operation / requirement Specified value Possible
cause / remedy
1
Transmitting

push-button
The desired transmitting push-button is programmed.
The vehicle is inside the garage door range.
The garage door opener signal has a range of at least
85% of the range of the garage door hand transmitter or
15m.
Press programmed transmitting push-button.
Garage door is
activated.AD68.05-P-
5000A

Garage door opener
diagnosis, previous
knowledge
AD68.05-P-2000A

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Interior Equipment - 163 Chassis
me
Saturday, October 02, 2010 3:35:21 PMPage 10 © 2006 Mitchell Repair Information Company, LLC.