Circuit Description
WARNING: This page is about a different car, the 2000 Isuzu Rodeo and 2000 Isuzu Amigo. However, it is still accessible from the selected car via links, so may be relevant.
PCM controls A/C compressor clutch operation by turning on the ground circuit for A/C Compressor Relay. If PCM commands A/C compressor clutch ON but circuit voltage remains high, or if PCM commands A/C compressor clutch OFF but circuit voltage remains low, DTC P1546 will be set.