Riviera V6-231 3.8L VIN C SFI (1989)
operation are indicated by the status light being turned "ON" or turned "OFF." These status indicators are specific to the system level you are in (ECM or
BCM). A brief summary of each status light is provided below:
1.
The "LO PRESS" status indicator is turned "ON" 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.
2.
The "REC" status indicator is turned "ON" whenever the BCM is commanding air recirculation.
3.
The "A/C" status indicator is turned "ON" whenever the BCM commands air flow to be out the A/C vents. The light should be "ON" in A/C and
bi-level modes.
4.
The "DEFR" status indicator is turned "ON" whenever the BCM commands air flow to be out the defroster outlet. The light should be "ON" in
defrost and heater-defrost modes.
5.
The "HTR" status indicator is turned "ON" whenever the BCM commands air flow out the floor outlets. The light should be "ON" in heater,
heater-defrost and bi-level modes.
6.
The "COMP" status indicator is turned "ON" whenever the BCM is requesting the ECM to engage the compressor clutch. The light indicates
whether the clutch request has been sent by the BCM, but actual operation depends on the ECM's decision and on the integrity of the compressor
clutch system.
