Tab%2015%20Center%20Console%20Switch, BMW educational info, Dokumentacja
[ Pobierz całość w formacie PDF ]//-->CENTER CONSOLE SWITCH CENTER (SZM)OVERVIEWThe 1999 Model Year E38 and E39 vehiclesare equipped with a new Center ConsoleSwitch Center (SZM).The SZM directly controls:• Front Seat Heating• Rear Window Roller BlindThe SZM provides a diagnostic interface withthe DIS/MoDiC via the K BUS for the seatheating and Rear Roller Blind systems.SZM also provides a unitized switching center for Park Distance Control (PDC), DynamicStability Control (DSC III) and Electronic Damper Control (EDC).The switch signal output for these systems is a direct output signal. All diagnosis functionsare carried out through their respective control systems.SEAT HEATING OPERATIONThe front seat heaters are adjustable through threeranges of heating output temperature.Pressing the respective seat heater button onceprovides stage 1. All three LEDs illuminate and theheating elements are provided regulated outputcurrent producing a seat temperature of 111OF.Pressing the button a second time provides stage 2. The top LED switches off and theheating elements are regulated to an output temperature of 102OF. Pressing the button athird time provides stage 3. The top and middle LEDs are off and the heating elements areregulated to an output temperature of 95OF.The SZM monitors the seat heating element temperature via an NTC feedback signal toregulate the output current which maintains the seat temperature.Seat heating is switched off by pressing the button a fourth time, pressing and holding thebutton for more than 1 second or when the ignition is switched off.145SZM MONITORING OF SEAT HEATINGBattery Voltage:The SZM switches current supply to the heating elements off when bat-tery voltage drops below 11.4 volts. However, the heating stage LEDs remain on.Regulated output current resumes when battery voltage raises above 12.2 volts for morethan 5 seconds.SZM Internal Temperature:The power output stages for the seat heating elements gen-erate a considerable amount of heat when in stage 1 operation. The SZM monitors it’s owninternal temperatures and reduces the heating output when internal temperatures rise to atemperature of 185OF or switches it off completely above 203OF.As with battery voltage monitoring, the heating stage LEDs remain on when these temper-atures are exceeded.Fault Monitoring:The SZM monitors the temperature sensors and heating mats for faults.Detected faults are stored in the SZM. Fault Symptom Troubleshooting in conjunction withstored faults will initiate the diagnostic paths using the DIS/MoDiC.The following faults can be recognized:• Shorts or opens in the wiring circuits.• Shorts or opens in the temperature sensors• Open in heating element.If a short is detected in the temperature sensor, the seat heating is switched off to preventoverheating. The Stage LEDs are also switched off with this fault present.REAR WINDOW ROLLER SUNBLIND OPERATIONThe roller sunblind is activated by momentarily pressing and releasing (one touch) the sun-blind rocker switch in the SZM. The SZM activates the motor in the appropriate direction.The SZM switches the motor off when the motor amperage increases indicating the blindhas reached the end of its intended travel.Fault Monitoring:The SZM continually monitors the motor drive amperage loads to deter-mine jamming or blockages. If current values exceed preset values, the motor is switchedoff immediately.Faults are stored in the SZM for opens or shorts in the motor or motor’s wiring circuit. TheSZM also provides diagnostic requests to monitor the switch input status via the DIS/MoDiC.146SZM IPO SCHEMATIC1471999 MODEL YEAR NAVIGATION SYSTEMSOVERVIEWThe 1999 Model Year has expanded Navigation System availability for all BMW vehicles.The E38/E39 systems are primarily carry over from previous systems with softwareimprovements.Currently there is one Navigation system available for the E46 which is based on the famil-iar Mark II original equipment system. In the future there will be three additional systems(refer to chart on next page).For background infor-mation on previousmodel year Mark II,Mark IIi and E36Accessory NavigationSystems refer to:•On-Board Monitorwith GPSNavigationSystem1998 New ModelUpdate (titled1997 Part 2).Board MonitorwithGPS NavigationSystemTrainingReferenceManualNew ModelUpdate• Part Two (From 7-97)TrainingReferenceManualNEW MODEL UPDATE - PART TWO•BMW of North America, Inc.Professional DevelopmentBMW of North America, Inc.Professional DevelopmentST96-07ST97-13This section will cover the changes that occurred to the systems where different for the E46Mark II system. The release of future systems (E46 Radio Navigation and E46 Mark IIiaccessory system and E46 Mark IIi monochrome accessory system) will be addressedwhen released.148 [ Pobierz całość w formacie PDF ]