ACC calibration and fault codes - Saab 9-5

Model year 1998-2005

Calibration is done by starting the engine and simultaneously pressing the AUTO and OFF buttons. Calibration takes about 30 seconds. Calibration must be performed if the battery has been disconnected/discharged, if the ACC unit or a stepping motor have been replaced or its position changed.

Calibration is also automatic directly following engine start in the following cases:

• new ACC fitted
• +30 supply was cut earlier than 10 minutes after the ignition was last turned off (usually in connection with battery replacement).

While calibrating, the number of stored diagnostic trouble codes is displayed instead of the left-hand temperature. Diagnostic trouble codes 0-23 are displayed for 3 seconds each instead of the right-hand temperature.

Attachment 9460

This is a list compiled from WIS documentation

Code	Problem	OBD
1	Internal control module malfunction	B1605
2	Cabin temperature sensor - open or short circuit	B1350
3	Solar sensor	B1340
4	Mixed-air temperature sensor, LH - open or short circuit	B1345
5	Mixed-air temperature sensor, RH - open or short circuit	B2345
6	Stepping motor, air-mixing flap, LH - open or short circuit	B2490
7	Stepping motor, air-mixing flap, LH - motor jam	B2496
8	Stepping motor, air-mixing flap, LH - no mechanical contact with flap	B2495
9	Stepping motor, air-mixing flap, RH - open or short circuit	B2290
10	Stepping motor, air-mixing flap, RH - motor jam	B2296
11	Stepping motor, air-mixing flap, RH - no mechanical contact with flap	B2295
12	Stepping motor, air distribution flap - open or short circuit	B2400
13	Stepping motor, air distribution flap - motor jam	B2406
14	Stepping motor, air distribution flap - no mechanical connection between motor and flap	B2405
18	Solenoid valve, heat exchanger shut-off valve - open or short circuit	B2375
19	Circulation pump - open or short circuit	B2380
20	Ventilation fan	B2425
21	DC motor, air recirculation flap - open or short circuit	B2410
22	ACC software
23	Sensor Ground	B2945

Model year 2006-2009

Attachment 11045

The stepping motors need no feedback to the control module (position sensor). By sending a known number of pulses, the control module always knows how far a flap has moved. This is possible on condition that the control module has calibrated itself by turning the flaps to their respective end positions so that it knows the position of the flaps.

Manual calibration can be performed by starting the motor and simultaneously pressing the AUTO and REC buttons.

Calibration is confirmed by SID and the message "ACC: CALIBR. STARTED" is shown on the main instrument unit display. This takes approximately 20 seconds.

Manual calibration must be performed if the stepping motor is replaced, removed or if the position of the flaps is changed. Calibration must also be performed when the battery has been disconnected.

Attachment 11044

An automatic calibration takes place: after 5 operating cycles and when the ignition has been off for more than 120 minutes. This takes place for the fifth time in the 119th minute before the ACC control module enters rest position.

Diagnostics
During calibration any diagnostic trouble codes for the flaps are stored in the ACC unit and can be read using the diagnostic tool.