System Self - Test

System Self - Test

The system self test procedure drives all the actuator motors, to check their operation. If an actuator is operating incorrectly or operating outside of its limits then a fault code will be present.

Before commencing with the actuator check procedure, ensure the car is operating under normal conditions.


Some system generated fault codes can be displayed on the control panel screen. When a fault is flagged, an audible "beep" will sound and the message "Er" will be displayed for five seconds, after the ignition is switched to position II. To display stored "panel fault codes", follow this procedure:

- Switch off the ignition

- Press and hold the AUTO and FRESH / RECIRC buttons simultaneously while switching the ignition to position II.

- All of the panel LEDs and all LCD segments will flash ON and OFF. Any function LED indicator or LCD segment that does not flash suggests a fault condition within that area of the panel, or with the LED or LCD.

- Press AUTO

- The control panel display will flash and scroll through the list of flagged fault codes. A maximum of five codes will be stored and displayed. If 0 is displayed, no fault codes are flagged.

- Press FACE to manually scroll through the fault codes

- When a fault code is displayed, an accompanying beep will indicate if the fault is present. If the code is not accompanied by a beep, the fault occurred previously.

NOTE: Faults that are present can not be cleared until the cause of the fault is repaired.

- To clear fault codes, press HRW and FACE simultaneously. Wait 30 seconds for the A/CCM to retest the system and reflag any current faults.

- Press PUSH OFF to return the system to normal operation (default panel settings).



Panel Communication Check

The data link, power, and lighting circuits between the A/CCM and the control panel can be checked by simultaneously holding AUTO and FAN while the ignition is switched to position II. Panel control LEDs will illuminate to indicate that each circuit is OK, as follows:


Circuit LED

Ignition switched power supply (pos. II) circuit Defrost button LED
Ignition switched power supply (pos. I, Aux.) circuit Face button LED
"Clock" circuit Bi-level button LED
"Start" circuit Foot button LED
"Data" circuits Defrost/foot button LED
Panel lighting (headlamps on) Recirc. button LED



Actuator Check







The control panel, system actuators and certain components can be checked by simultaneously holding AUTO and FRESH / RECIRC while the ignition is switched to position II.

Control panel

All of the panel control LEDs and LCD segments will flash on and off to indicate that each panel circuit is OK. If a LED does not flash, a fault condition in that area of the panel is indicated, or the LED has failed. If a LCD segment does not flash, a fault condition in that area of the panel is indicated, or the LCD segment has failed.


Actuators and components

Check the actuators by selecting AUTO, then FRESH / RECIRC. Select FACE to cycle through the actuator mode conditions 20 - 27 as shown in the following table. After the check is complete, select PUSH OFF to restore normal system operation.

Control panel diagnostic monitoring

The A/CCM can determine incorrect data by the absence of a minimum number of high" and "low" bits in each data "block" received or sent. The A/CCM continuously checks the data flow between the A/CCM and the control panel. If consistent incorrect data is detected, a DTC is flagged.

PDU Panel

DICs: U1263 none
U1264 none

Refer to the (PDU) DTC Summary.