Heating and Air Conditioning

Press AUTO and VENT at the same time and then release them. The Automatic Climate Control (ACC) control module will then run through a fault diagnosis program (taking about 40 seconds), which is indicated by 88 flashes on the display. After fault diagnosis, the number of faults is shown on the display. Press VENT to read the first diagnostic trouble code. Press again for the next diagnostic trouble code.

Press AUTO to leave the diagnostics mode.