Status Lights

On Board Diagnostic Flow Diagram:

Description:
While in diagnostics, the liquid crystal displays on the Electronic Climate Control (ECC) panel are used to indicate the status of various inputs and operating conditions. The meaning of each word or symbol on the ECC panel will change depending on whether the BCM or PCM system level is selected. The following is a description of what each word and symbol represents in each system:

BCM Status Lights: These are active only when the BCM System level is selected. Refer to Diagnostic Flow Diagrams.

1. The "OFF" status indicator is turned "ON" whenever the BCM commands the air inlet valve to the recirculation position.

2. The "AUTO" status indicator is turned "ON" whenever the up - down air control switch on the CCP is in the "Normal" position.

3. The status indicator is turned on whenever the BCM is requesting the PCM to engage the A/C compressor clutch. The light does not indicate whether the clutch is enabled or disabled by the PCM. Actual operation depends on the PCM and on the integrity of the compressor clutch system.

4. The 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, unless the high side refrigerant temperature drops below -5°F (-21°C). Below -5°F (-21°C), the low refrigerant pressure switch will open due to the temperature/pressure relationship of Freon.

5. The "LO FAN" status indicator is turned "ON" 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.

6. The "NORM FAN" status indicator is turned "ON" whenever the BCM is commanding the HVAC Programmer to close the heater water valve preventing coolant from flowing from the engine to the heater core.

7. The "HI FAN" status indicator is turned "ON" whenever the BCM is commanding the HVAC Programmer to not supply vacuum to the park brake release motor (park brake remains applied). The light is "OFF" when the BCM commands the park brake to be released.