Status Lights

While in the BCM system level in the diagnostic service mode, the mode indicators on the Climate Control Panel (CCP) of the CCDIC are used to indicate the status of certain operating modes. The different modes of operation are indicated by the status light being illuminated or turned off.

A brief summary of each status light is provided below:

1. The "FRONT DEFOG" status indicator is illuminated whenever the BCM is requesting the ECM to engage the compressor clutch. The light does not indicate whether the clutch is enabled or disabled by the ECM, and actual operation depends on the ECM and the integrity of the compressor clutch system.

2. The "REAR DEFOG" status indicator is illuminated whenever the BCM senses that the low refrigerant pressure switch is open. The light should remain off if the refrigerant system is fully charged and being properly controlled. However, when the ambient temperature drops below approximately -5°F (21°C), the light will come on due to the pressure temperature relationship of refrigerant R-12.

3. The "LO Fan" status indicator is illuminated whenever the BCM is commanding the A/C-DEF mode door to divert air flow to the A/C outlets, as in the A/C or normal purge modes. This light will be on whenever the ECC system is in the heater, intermediate, defrost, and cold purge modes.

4. The "NORM FAN" status indicator is illuminated whenever the BCM is commanding the UP-DOWN mode door to divert air flow up, away from the heater outlet. This light will be off whenever the ECC system is in the heater or normal purge mode.

5. The "OFF" status indicator is illuminated whenever the BCM is commanding the RECIRC mode door to the recirculation position (pulls air from inside of car). The light is off if the BCM is commanding use of outside air. The light does not indicate that the door has responded to the BCM's command. Actual operation depends on the integrity of the mode door system.