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  1. #1
    Saab Nut
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    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.

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    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

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  2. #2
    Saab Nut
    Join Date
    02 Aug 2010
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    Model year 2006-2009

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    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.

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    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.

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