B1009

B1009-RECIRCULATION SWITCH REQUEST INPUT CIRCUIT/PERFORMANCE (ATC & MTC)

For a complete wiring diagram REFER to DIAGRAMS/ELECTRICAL .

Theory of Operation


The switch input changes when the switch is pushed down. A stored DTC indicates that the recirculation switch was stuck in a pushed position for more than 10 minutes, but has since returned to its normal state. An active DTC indicates that the recirculation switch is stuck in a pushed position.


- When Monitored:
With the ignition on.

- Set Condition:
If the recirculation switch is detected in a pushed position for more than 10 minutes.






Diagnostic Test


1. INSPECT THE A/C HEATER CONTROL FOR DAMAGE
Inspect the A/C Heater Control for damage.
Is the A/C Heater Control damaged?

Yes


- Replace the A/C Heater Control.
- Replace the A/C Heater Control.
- Perform HVAC VERIFICATION TEST - VER 1.HVAC Verification Test.


No


- Go To 2


2. INSPECT FOR OBJECT OR SUBSTANCE CAUSING THE RECIRCULATION SWITCH TO STAY OR STICK IN A PUSHED POSITION
Inspect the A/C Heater Control for anything that would cause the recirculation switch to stay or stick in a pushed position.
Is anything present that would cause the panel mode switch to stay or stick in a pushed position?

Yes


- Repair as necessary.
- Replace the A/C Heater Control.
- Perform HVAC VERIFICATION TEST - VER 1.HVAC Verification Test.


No


- Go To 3


3. CHECK FOR NORMAL RECIRCULATION SWITCH & STATUS INDICATOR FUNCTION
Turn the ignition on.
Set the Blower control to any position except Off.
Press the A/C request switch on.
Set the panel mode to any position except defrost.
Press the recirculation switch.
Does the recirculation status indicator illuminate?

Yes


- Go To 4


No


- Replace the A/C Heater Control.
- Replace the A/C Heater Control.
- Perform HVAC VERIFICATION TEST - VER 1.HVAC Verification Test.


4. VERIFY THAT DTC IS STILL ACTIVE
With the scan tool, erase HVAC DTCs.
Turn the ignition off, wait 10 seconds, and then turn the ignition on. Wait 10 minutes before proceeding.
With the scan tool, read HVAC DTCs.
Does the scan tool display this DTC as active?

Yes


- Replace the A/C Heater Control.
- Replace the A/C Heater Control.
- Perform HVAC VERIFICATION TEST - VER 1.HVAC Verification Test.


No


- Replace the A/C Heater Control.
- Perform HVAC VERIFICATION TEST - VER 1.HVAC Verification Test.