Test Procedures

NOTE: Test numbers refer to test numbers on diagnostic chart.

A "c" displayed on one or both panels indicates a loss of the clock signal to the affected panel.
A "d" displayed on either panel indicates a loss of the data signal to the affected panel.
If one panel is affected, only branches of the critical circuits to that panel require investigation.
If both panels are affected, several circuits require investigation. If depressing the OFF button on ECCP does not result in blower turning off, panels are not in communication with BCM. This could be caused by a loss of 5 volts or ground to panels. If blower turns off, all remaining critical circuits must be checked.

Fig 1: Chart C-1, Schematic, Display Panel Diagnosis (1 of 6)

Fig 2: Flow Chart C-1, Display Panel Diagnosis (1 of 6)

Fig 3: Flow Chart C-1, Display Panel Diagnosis (2 Of 6)

Fig 4: Flow Chart C-1, Display Panel Diagnosis (3 Of 6)

Fig 5: Flow Chart C-1, Display Panel Diagnosis (4 Of 6)

Fig 6: Flow Chart C-1, Display Panel Diagnosis (5 Of 6)

Fig 7: Flow Chart C-1, Display Panel Diagnosis (6 Of 6)