WJ Climate Systems
1999-2004 Grand Cherokee modelli dispongono di un manuale di controllo della temperatura (MTC) o Automatico zona di controllo (AZC). Il controllo automatico è disponibile solo sui modelli o Overland Limited. Il manuale della temperatura HVAC sistema di controllo utilizza una combinazione di elettrici e di controllo del vuoto. Il sistema automatico di controllo di zona HVAC utilizza solo i comandi elettrici. Questi controlli forniscono dal conducente del veicolo con un numero di opzioni di impostazione per controllare il clima e il comfort all'interno del veicolo. Fare riferimento al manuale del proprietario in glove box veicolo per ulteriori informazioni sul funzionamento suggerito e l'utilizzo di questi controlli. Entrambe a / c pannelli di controllo del riscaldatore sono situati sul pannello interno strumento del piantone dello sterzo e sotto la radio. Entrambi i pannelli di controllo contengono rotativo di tipo manopola di regolazione della temperatura (s), un interruttore di tipo rotativo modalità manopola di controllo, un tipo di motore rotativo, interruttore ventilatore manopola di velocità e un compressore aria condizionata interruttore di pulsante. La parte posteriore defogger finestra pulsante interruttore a pressione si trova anche su un / pannello di controllo del riscaldatore c. Il pannello di controllo AZC dispone anche di un pulsante di ricircolo interruttore a pulsante e un display fluorescente a vuoto area.
Il modulo di controllo AZC utilizza la tecnologia di rilevamento a raggi infrarossi per controllare i livelli di comfort degli occupanti, non la reale temperatura vano passeggeri. Dual sensori a infrarossi montato di fronte la centrale indipendente misurano la temperatura superficiale di mantenere clienti temperatura di comfort percepita in condizioni mutevoli. Doppio controllo della temperatura Zone fornisce ampie variazioni da lato a lato a temperatura di comfort a superare le esigenze di entrambi gli occupanti dei sedili anteriori. Questo sistema sostituisce di rilevamento temperatura interna dell'aria ed i sensori solari utilizzati per approssimare il controllo diretto della rilevamento mediante programmi di controllo complessi.
The 2003-2004 model year AZC Module is NOT interchangeable with 1999-2002 AZC Modules due to revised control software.
Fault codes are two-digit numbers that identify a circuit that is malfunctioning. The Automatic Zone Control (AZC) control module has a system self-diagnostic mode which continuously monitors various parameters during normal system operation. If a system fault is detected, a current and historical fault is recorded. When the current fault is cleared, the historical fault remains until reset (manually or automatically). Both the current and historical fault codes can be accessed through either the front panel, or over the Programmable Communications Interface (PCI) bus using a DRBIII scan tool, and the appropriate diagnostic information. The two different kinds of fault codes are: 1. Current Fault Codes - Current means the fault is present right now. There are two types of current faults: input faults, and system faults. 2. Historical Fault Codes - Historical or stored means that the fault occurred previously, but is not present right now. A majority of historical fault codes are caused by intermittent wire harness or wire harness connector problems.
1. To enter the self-diagnostic mode, depress the a/c and recirc buttons at the same time and hold. Rotate the left temperature control knob clockwise (CW) one detent. 2. If you continue to keep the a/c and recirc buttons depressed, the AZC control module will perform a Segment Test of the Vacuum Fluorescent (VF) display. In the Segment Test you should see all of the display segments illuminate as long as both buttons are held. If a display segment fails to illuminate, the vacuum fluorescent display is faulty and the a/c heater control must be replaced. 3. After viewing the Segment Test, release the A/C and Recirc buttons and the display will clear momentarily. If there are no fault codes, the �00� display value will remain in the VF window. Should there be any codes, each will be displayed for one second in ascending numerical sequence (note: no effort is made to display faults in the order they occurred). The left side set temperature display will be blanked and the right side set temperature display will indicate current and historical codes (8 historical max) presently active. Once all codes have been displayed, the system will repeat the fault code numbers. This will continue until the left side set temperature control is moved at least one detent position in either direction, by pressing both the A/C and Recirc buttons at the same time, or the ignition is turned off. Record all of the fault codes, then see the Current and Historical Fault Code charts below for the descriptions.
Current faults cannot be electronically cleared. Repair must be made to the system to eliminate the fault causing code. Historical fault codes can be cleared manually, or automatically. To clear a historical fault manually, depress and hold either the A/C or Recirc button for at least three seconds while the display is in the fault code mode of operation. Historical fault codes are cleared automatically when the corresponding current fault code has been cleared, and has remained cleared for 72 ignition cycles. The faults have been cleared when two horizontal bars appear in the Test Selector display.
Calibrate the door actuators after making any repairs to the AZC system. To calibrate the door actuators proceed as follows: 1. Turn the ignition on.
The air conditioning compressor will engage in certain modes to cool and remove moisture from air entering the passenger compartment. The AZC control, when it is not set in the auto mode, always defaults to A/C enabled. The LED illuminates when the control requests A/C. The customer must toggle A/C off by depressing the button every time he turns to manual mode or the A/C is enabled. Additionally, when the vehicle is off for a "calibratable" amount of time, automatic A/C is again enabled and the customer must again force it off by depressing the button.
Troubleshooting: See also Blower motor
Cold air leaking into passenger compartment foot well - 1999-2000 models (see TSB #242599) Condensation on exterior of heater housing - 1999-2000 models (see TSB #240699A) Heater A/C system changing to defrost mode when accelerating - 1999-2000 models (see TSB # 242499) Reduced airflow from center outlets - 1999 models (see TSB # 240799) Temperature coming from the HVAC system blows cold air only. - Air temperature remains cold regardless of the position of the temperature knob. Observe the temp door actuators on the HVAC housing while rotating the temp knob. If the actuators rotate, but the air temp does not change, the problem could be a broken temp door or temp door stop. Blend doors and doorstops are available through the Mopar Parts. The part number of the doorstop is 05012711AA. Temperature fluctuation in the automatic mode - 1999 models (see TSB #241699. Involves AZC module recalibration. Also addresses having to set the temperature too high or low to maintain a comfortable passenger compartment, constantly having to adjust the temperature setting when in automatic mode and temperature overshoot in automatic mode). Water drips onto the passenger floor when air conditioning is on - Ensure the condensation drain is free of restriction. High temperature and humidity will promote condensation buildup on the exterior of the HVAC housing. Self adhesive foam tape is available that will help absorb water droplets that may form on the HVAC housing. Dry the areas where water condensation is the most. Carefully install self adhesive foam tape Part # 05015245AA. Whistling sound from heater blower - 1999 models (see TSB # 240899) |