1993 Cadillac AllanteFACTORY OEM SERVICE PROCEDURE

Override Displays: Notes

Override displays are operated as defined under SELECTION OF TESTS  under HOW TO OPERATE DIAGNOSTICS. When troubleshooting a malfunction, the BCM and PCM override features allow testing of certain system functions regardless of normal program instructions. Upon selecting a test that function's current operation will be represented as a percentage of its full range and this value will be displayed on the ECC panel.

The display will alternate between "- -" for one second followed by the normal program value for 5 seconds. This alternating display is a reminder that the function is not currently being overridden.

Touching the WARM or COOL buttons on the ECC panel begins the override at which time the display will no longer alternate to "- -". Touching the WARM button increases the value while the COOL button decreases the value. Upon release of the button, the display may either remain at the overridden value or automatically return to normal program control. This depends on which function is being overridden at the time. If the display remains at the override value, normal program control can be resumed in one of three ways:

  1. Selection of another override test will cancel the current override.
  2. Selection of another system will cancel the current override.
  3. Overriding the value beyond either extreme (zero or 99) will display "- -" momentarily and then jump to the opposite extreme. If the button is released while "- -" is displayed, normal program control will resume and the display will again alternate.
The override test type is unique in that any other test type (except OUTPUT CYCLING) within the selected system may be active at the same time. After selecting an override test touching the OFF button will allow selection of another test type, however, the ECC panel will continue to display the selected override. By selecting another test type and test while at the same time touching the WARM or COOL button, it is possible to monitor the effect of the override on different vehicle parameters.

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