Greg B

i have checked many threads and cant find an answer., i have a 95 grand cherokee orvis 5.2. i am not getting much air from my vents or defrost. i can adjust fan speed but not directional change(floor to upper vents or defrost. i think i checked codes right and got 88. i removed center bezel and hud unit, found a harness not plugged in but dont know if it supposed to be or where. the hose on the passenger side has a metal something the joins hoses and i get a bunch of air leaking out there. i have attached pictures hopefully helps. maybe someone has already been down this road.

2000 WJ

AZC fault codes

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.

AZC self-diagnostic mode:

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 **** 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.

Clearing fault codes

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.

AZC fault codes

Input faults 01 = IR thermister circuit open

02 = IR thermister circuit shorted

03 = Fan pot shorted

04 = Fan pot open

05 = Mode pot shorted

06 = Mode pot open

07 = IR sensor delta too large

08 = Reserved

09 = Reserved

10 = One of four motor drivers has drive "A" shorted to ground

11 = Engine air intake temperature bus message missing

12 = Country code bus message missing

System faults 13 = Mode motor not responding

14 = AI (Recirc) motor not responding

15 = Left temperature door not responding

16 = Right temperature door not responding

17 = Mode door travel range too small

18 = Mode door travel range too large

19 = AI (Recirc) door travel too small

20 = AI (Recirc) door travel too large

21 = Left temperature door travel too small

22 = Left temperature door travel too large

23 = Right temperature door travel too small

24 = Right temperature door travel too large

25 = Calibration check sum error

26 = Engine coolant temp bus message missing

27 = Vehicle speed bus message missing

28 = Engine RPM bus message missing

29 = OAT bus message missing

30 = Display intensity bus message missing

31 = VIN number bus message missing

32 = Raw OAT buss message missing

Input faults 33 = IR thermister circuit was open

34 = IR thermister circuit was shorted

35 = Fan pot was shorted

36 = Fan pot was open

37 = Mode pot was shorted

38 = Mode pot was open

39 = IR sensor delta was too large

40 = Reserved

41 = Reserved

42 = One of four motor drivers had drive 9A9 shorted to ground

43 = Engine air intake temperature bus message missing

44 = Country code buss message missing

System faults 45 = Mode motor was not responding

46 = AI (Recirc) motor was not responding

47 = Left temperature door was not responding

48 = Right temperature door was not responding

49 = Mode door travel range too small

50 = Mode door travel range too large

51 = AI (Recirc) door travel range too small

52 = AI (Recirc) door travel range too large

53 = Left temperature door travel too small

54 = Left temperature door travel too large

55 = Right temperature door travel too small

56 = Right temperature door travel too large

57 = Calibration check sum error

58 = Engine coolant temp bus message missing

59 = Vehicle speed bus message missing

60 = Engine RPM bus message missing

61 = OAT bus message missing

62 = Display intensity bus message missing

63 = VIN number bus message missing

64 = Raw OAT bus message was missing

65 = Reserved

66 = Reserved

67 = Reserved



Calibrating AZC door actuators



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.

2. Set the AZC to automatic.

3. Turn the ignition off.

4. Remove the IOD fuse from the Power Distribution Center. Wait several seconds, and then install the IOD fuse.

5. Turn the ignition on. Do not touch any of the AZC controls for at least one minute to allow the calibration function to run to completion.



Every 20 key cycles the AZC head initiates a re-calibration routine which identifies pulse counts required to achieve full door travel. Also during this routine all modes and functions are validated as functional. When the self calibration routine is complete, the control head resets itself to its last settings.

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.

Greg B

I finally got it to give code and got a 55 and 38. so anyone know where the doors are on a 95?