Adjustment of ACC

/ 900 / 1998 / 8. Body, climate control system / Climate control MCC and ACC / Adjustment, replacement / Adjustment of ACC

Adjustment of ACC

	> ACC
	ll V ON/ENTER
	READ FAULT CODES OBTAIN READOUTS ACTIVATE >ADJUSTING
	ll V ON/ENTER
	USER-PROGRAMMING PARKING HEATER INDOOR TEMPERATURE TEMPERATURE SCALE RECIRCULATION

The ACC control module incorporates facilities for adjusting the parameters of certain functions to suit customer preferences. These functions are:

User programming

Parking heater

Indoor temperature

Temperature scale

Recirculation

The adjustments are described in the following five pages.

User programming

	USER-PROGRAMMING RECIRC. FLAP MOTOR HEATED REAR WINDOW
	ll ll ll F1 F2 ll ll ==== > V
	HEATED REAR WINDOW NORMAL FUNCTION SELECT
	F3 ll F4 ll V V ON/ENTER
	ll MAIN MENU ll V

In the case of user programming by means of the buttons on the ACC panel it is only possible to select the opposite of what the ACC control module has selected in AUTO mode. Using the ISAT, the ACC control module can be user-programmed irrespective of the AUTO setting.

Important
User programming carried out with the ISAT will be erased if deprogramming is done with the buttons on the ACC panel.

Parking heater

ll==========als;=> ll ll	PARKING HEATER 100%% HEAT CHANGE OK
ll ll ll ll	ll ll ll F1 F2 ll ll ==== > V
ll ll ll ll	PARKING HEATER 100%% HEAT SELECT
ll ll ll	F3 ll F4 ll V V ON/ENTER
ll ll ll ==========als;===	ll ll ll ========== ==========ll

The ISAT command "PARKING HEATER" enables changes to be made in the ACC's parking heater mode. When battery positive is applied to pin 3 of the ACC control module, it goes into parking heater mode (see Technical description, ACC for further information). Two different control processes can be chosen with the ISAT:

•

100%% HEAT (basic setting) The control module sets the blended-air flap to the position for maximum heat.

•

CONTROLLED HEAT The control module adjusts the blended-air flap according to the selected cabin temperature.

Indoor temperature

ll==========als;> ll ll	INDOOR TEMPERATURE 0 ° C CHANGE OK
ll ll ll ll	ll ll ll F1 F2 ll ll ==== > V
ll ll ll	INDOOR TEMPERATURE + -
ll ll ll	F3 ll F4 ll V V ON/ENTER
ll ll ll ==========als;===	ll ll ll ========== ==========ll

With the ISAT command "CABIN TEMPERATURE" it is possible to adjust how the cabin temperature sensor perceives the cabin temperature. If the cabin temperature sensor offset is increased, the temperature in the cabin will be increased by the corresponding number of degrees. The adjustment is done in steps of 0.1 ° C. Suitable adjustment intervals are ±0.3 ° C.

Important
This adjustment should be done with good judgement. The adjustment is possible up to ± 3 ° . Too large an adjustment however leads to the ACC system reacting totally differently when starting from cold. Much stronger cold respective heat as well as greater ventilation effect can be achieved.

Temperature scale

ll==========als;> ll ll	RECIRCULATION NOT SPEED DEPENDENT CHANGE OK
ll ll ll ll	ll ll ll F1 F2 ll ll ==== > V
ll ll ll	RECIRCULATION NOT SPEED DEPENDENT SELECT
ll ll ll	F3 ll F4 ll V V ON/ENTER
ll ll ll ==========als;===	ll ll ll ========== ==========ll

With the ISAT command "TEMP SCALE" it is possible to change the temperature shown in the ACC unit's display between Celsius and Fahrenheit. This can also be done by pressing the buttons for temperature up and temperature down simultaneously for at least two seconds.

Recirculation

	TEMPERATURE SCALE * C F	== ON/ENTER ==========als;>
	ll F2 ll ll V
	TEMPERATURE SCALE * C F	== ON/ENTER ==========als;>

With the ISAT command "RECIRCULATION" the recirculation flap can be controlled by the speed of the car so that the ACC control module always closes the flap when the car's speed is 0 km/h.

Note
Since the ABS control module counts all speeds below 3 km/h as stationary, the ACC control module will open and close the recirculation flap at about 3 km/h.

Adjustment of ACC

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