Operation CHARM: Car repair manuals for everyone.

Status Display

When in the diagnostic mode, mode indicators on the CCP indicate the status of certain system operating modes. Different modes of operation are indicated by light being turned "ON" or "OFF." Operation of the status lights is as follows:
1. The Outside Temp status light is illuminated when BCM commands ECC compressor clutch to engage. The light only indicates whether or not clutch is enabled by BCM and does not indicate actual operation of the compressor clutch system.
2. The Auto Fan status light is illuminated when feedback signal from cooling fan control module to BCM indicates that fans are operating. The light should be "OFF" whenever fans are "OFF."
3. The Hi Fan status light is illuminated when BCM is commanding up-down mode door to divert air flow up away from heater outlet. The light will be "OFF" whenever ECC system is in "heater" or "normal purge" modes.
4. The Lo Fan status light is illuminated when BCM is commanding A/C-DEF mode door to divert air flow to A/C outlets as in "A/C" or "normal purge" modes. The light will be "OFF" whenever ECC system is in "heater," "intermediate," "defrost" and "cold" modes.
5. The degrees F status light is illuminated when BCM senses refrigerant low pressure switch is open. The light will come "ON" when ambient temperature falls below approximately - 5°F because of pressure-temperature relationship of refrigerant. The light will remain "OFF" under all other conditions if refrigerant system is fully charged and properly controlled.
6. The degrees C status light is illuminated when BCM is commanding heater water valve to block coolant flow through heater core. The light will remain "OFF" except when air mix door is commanded to "Max A/C" position.