B1009-92

B1009-92-RECIRCULATION SWITCH REQUEST INPUT - PERFORMANCE OR INCORRECT OPERATION



Theory of Operation

The Recirculation mode switch input changes when the switch is pushed inward. An active DTC indicates that the switch is stuck in a pushed position. A stored DTC indicates that the switch was stuck in a pushed position for more than 60 seconds but has since returned to its normal state.

- When Monitored:
With the ignition on.

- Set Condition:
If the Recirculation mode switch is stuck in a pushed position for more than 60 seconds. This DTC has a maturing time of 60 seconds and a de-maturing time of two seconds. If the DTCs status changes from active to stored, the DTC will stay in memory for 100 ignition cycles.





Always perform the HVAC Pre-Diagnostic Troubleshooting procedure before proceeding. Initial Inspection and Diagnostic Overview.

1. INSPECT FOR OBJECT HOLDING SWITCH IN A PUSHED POSITION
1. Inspect the A/C Heater Control for an object or debris holding the Recirculation mode switch in a pushed position.

Is the Recirculation mode switch being held in?

Yes

- Repair or clean the A/C Heater Control as necessary.
- Perform HVAC VERIFICATION TEST. HVAC Verification Test.

No

- Go To 2

2. A/C HEATER CONTROL
1. Turn the ignition on.
2. With the scan tool, erase HVAC DTCs.
3. Turn the ignition off for 10 seconds, and then turn the ignition on and wait a minimum of 60 seconds.
4. With the scan tool, read HVAC DTCs.

Does the scan tool display this DTC as Active?

Yes

- Replace and program the A/C Heater Control.
- Perform HVAC VERIFICATION TEST. HVAC Verification Test.

No

- Test complete.
- Perform HVAC VERIFICATION TEST. HVAC Verification Test.