Status Light Indicators

During self-diagnostics, the status light display on ECCP is used to indicate switchable parameter status. Each different mode of operation is indicated by its status light being turned on or off. Status light indicators are relative to system level being tested (ECM or BCM). See Figure and Figure .

1. ECM
   
   The following are brief summaries of ECM status light indicators. See Figure .
2. High
   
   Indicator light will be on when ECM is in closed loop fuel control. Light comes on only after coolant and O2 sensors reach operating temperature.
3. Med
   
   Indicator light only indicates whether Torque Converter Clutch (TCC) is enabled (on) or disabled (off) by ECM. Actual TCC engagement depends on TCC system being in working order.
4. Low
   
   Indicator light stays on when oxygen sensor signals rich exhaust condition to ECM. Light will flash on and off during warm engine, steady throttle, and proper fuel mix condition.
5. Off
   
   Indicator light will be on when ECM commands 4th gear. Light should only be on in 4th gear.
6. Left-Side AUTO
   
   Indicator light will be on when ECM commands 3rd gear. Light should only be on in 3rd or 4th gear.
7. °C
   
   Indicator light will be on when ECM commands 2nd gear. Light should only be on in 2nd, 3rd or 4th gear.
8. Upper Arrow (Icon)
   
   A/C compressor command upper arrow indicator light will be on only when ECM allows A/C clutch engagement through A/C relay. Light will also be on if BCM requests ECM to turn clutch on during test sequence. Light should be off if ECM commands disengagement. See Figure .
9. BCM
   
   The Following are brief summaries of BCM system status light indicators. See Figure .
10. Lower Arrow (Icon)
    
    Indicator light will be on if BCM senses low refrigerant pressure switch is open. Light will remain off if A/C system is fully charged and operational; however, light will come on when outside vehicle ambient temperature is less than -5°F (-21°C). This is due to the temperature-pressure relationship of R-12 refrigerant. See Figure .
11. Off
    
    Indicator light will be on when BCM commands air recirculation.
12. Med
    
    Indicator light will be on when BCM commands airflow out the A/C vents. Light should also be on in A/C and BI-LEV modes.
13. Low
    
    Indicator light will be on when BCM commands airflow out defroster outlets or when in defrost and A/C modes.
14. High
    
    Indicator light will be on when BCM commands airflow out floor outlets. Light should be on in heater mode.
15. Left-Side AUTO
    
    Indicator light will be on when BCM requests ECM to engage A/C compressor clutch.