B1009-92-RECIRCULATION SWITCH REQUEST INPUT - PERFORMANCE OR INCORRECT OPERATION
B1009-92-RECIRCULATION SWITCH REQUEST INPUT - PERFORMANCE OR INCORRECT OPERATION
For a complete wiring diagram, refer to the Wiring Information.
Theory of Operation
The HVAC A/C Heater Control contains various switches and knobs that are used to change the systems operation. Many of the switches are momentary switches which are normally open or in the Off position and the status changes when the switch button or knob is pushed or turned. An active DTC indicates that the switch is stuck in an On position. A stored Diagnostic trouble Code (DTC) indicates that the switch was stuck in a On position for more than 20 seconds but has since returned to its normal state of Off. For further information (Refer to 24 - Heating and Air Conditioning - Operation) .
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When Monitored:
With the ignition on.
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Set Condition:
If the Recirculation mode switch is stuck in a On position for more than 20 seconds. This DTC has a de-maturing time of one second. If the DTCs status changes from active to stored, the DTC will stay in memory for 100 ignition cycles.
Possible Causes |
|---|
| OBJECT HOLDING SWITCH IN AN ON POSITION |
| A/C HEATER CONTROL |
Always perform the HVAC Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 28 - DTC-Based Diagnostics/HVAC - Standard Procedure) .
1. INSPECT FOR OBJECT HOLDING SWITCH IN AN ON POSITION
| 1. | Inspect the A/C Heater Control for an object or debris holding the Recirculation mode switch in an On position. |
| NOTE: | Using the scan tool you can read the On/Off status of the control switch. |
Is the Recirculation mode switch being held in or stuck On?
Yes
- Clean or repair the A/C Heater Control as necessary. If you are unable to clean the switch to where the switch can work properly, replace and program the A/C Heater Control in accordance with the Service Information. (Refer to 24 - Heating and Air Conditioning/Controls/CONTROL, A/C and Heater - Removal)
- Perform the HVAC VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/HVAC - Standard Procedure) .
No
- Go To 2
| 1. | Turn the ignition on. |
| 2. | Using 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 20 seconds. |
| 4. | Using the scan tool, read HVAC DTCs. |
Does the scan tool display this DTC as Active or is the status of the switch reading On?
Yes
- Replace and program the A/C Heater Control in accordance with the Service Information. (Refer to 24 - Heating and Air Conditioning/Controls/CONTROL, A/C and Heater - Removal)
- Perform the HVAC VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/HVAC - Standard Procedure) .
No
- Test complete.
- Perform the HVAC VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/HVAC - Standard Procedure) .