B100A–RECIRCULATION SWITCH REQUEST INPUT CIRCUIT LOW (ATC)

For a complete wiring diagram Refer to Section 8W.

Theory of Operation


The switch input changes when the switch is pushed down. A stored DTC B100A indicates that the Recirculation mode switch was stuck in a pushed position for more than 10 minutes, but has since returned to its normal state. An active DTC B100A indicates that the Recirculation mode switch is stuck in a pushed position. An active DTC B100A will prevent proper Recirculation mode switch and status indicator function.


  • When Monitored:

    With the ignition on.

  • Set Condition:

    If the Recirculation mode switch stays in a pushed position for more than 10 minutes.


Possible Causes
  
A/C HEATER CONTROL DAMAGED
  
OBJECT HOLDING RECIRCULATION MODE SWITCH IN A PUSHED POSITION
  
SUBSTANCE CAUSING RECIRCULATION MODE SWITCH TO GET STUCK IN A PUSHED POSITION
  
A/C HEATER CONTROL
  



Diagnostic Test

1.INSPECT THE A/C HEATER CONTROL FOR DAMAGE



Is the A/C Heater Control damaged?

Yes


No
  • Go To 2

2.INSPECT FOR OBJECT OR SUBSTANCE CAUSING THE RECIRCULATION MODE SWITCH TO STAY OR STICK IN A PUSHED POSITION



Is anything present that would cause the Recirculation mode switch to stay or stick in a pushed position?

Yes


No
  • Go To 3

3.CHECK FOR NORMAL RECIRCULATION MODE SWITCH & STATUS INDICATOR FUNCTION





Does the Recirculation status indicator turn on and off?

Yes
  • Go To 4


No

4.VERIFY THAT DTC B100A–RECIRCULATION SWITCH REQUEST INPUT CIRCUIT LOW IS STILL ACTIVE





Does the scan tool display active: B100A–RECIRCULATION SWITCH REQUEST INPUT CIRCUIT LOW?

Yes


No