Diagnostic Test

INSPECT THE A/C HEATER CONTROL FOR DAMAGE
1. Inspect the A/C Heater Control for damage.
  Is the A/C Heater Control damaged?
  
  Yes
  - Replace the A/C Heater Control in accordance with the Service Information.
  - Perform BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
  No
  - Go to step 2
INSPECT FOR OBJECT OR SUBSTANCE CAUSING THE RECIRCULATION MODE SWITCH TO STAY OR STICK IN A PUSHED POSITION
1. Inspect the A/C Heater Control for anything that would cause 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
  - Repair as necessary.
  - Perform BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
  No
  - Go to step 3
CHECK FOR NORMAL RECIRCULATION MODE SWITCH AND STATUS INDICATOR FUNCTION
1. Turn the ignition on.
2. Set the Mode control to any position between Panel and Floor.
3. Press the Recirculation mode switch on and off several times while observing the Recirculation status indicator.
  Does the Recirculation status indicator turn on and off?
  
  Yes
  - Go to step 4
  No
  - Replace the A/C Heater Control in accordance with the Service Information.
  - Perform BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
VERIFY THAT DTC B100A-RECIRCULATION SWITCH REQUEST INPUT CIRCUIT LOW IS STILL ACTIVE
1. With the scan tool, erase HVAC DTCs.
2. Turn the ignition off, wait 10 seconds, and then turn the ignition on. Wait 10 minutes before proceeding.
3. With the scan tool, read HVAC DTCs.
  Does the scan tool display active: B100A-RECIRCULATION SWITCH REQUEST INPUT CIRCUIT LOW?
  
  Yes
  - Replace the A/C Heater Control in accordance with the Service Information.
  - Perform BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
  No
  - Perform BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .