Theory of Operation
WARNING: This page is about a different car, the 2005 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
The switch input changes when the switch is pushed down. A stored DTC 33 indicates that the A/C mode switch was stuck in a pushed position for more than 10 minutes, but has since returned to its normal state. An active DTC 33 indicates that the A/C mode switch is stuck in a pushed position. An active DTC 33 will prevent the control from entering diagnostic mode and performing certain diagnostic functions. It will also prevent proper A/C mode switch and status indicator function. For additional information about the A/C Heater Control's on-board diagnostics, refer to DIAGNOSIS AND TESTING .
- When Monitored:
With the ignition on.
- Set Condition:
If the A/C mode switch stays in a pushed position for more than 10 minutes.
| Possible Causes |
|---|
| OBJECT HOLDING A/C MODE SWITCH IN A PUSHED POSITION |
| SUBSTANCE CAUSING A/C MODE SWITCH TO GET STUCK IN A PUSHED POSITION |
| (C41) BLOWER SWITCH POSITION SIGNAL CIRCUIT SHORTED TO VOLTAGE |
| (C41) BLOWER SWITCH POSITION SIGNAL CIRCUIT SHORTED TO (C121) SENSOR GROUND CIRCUIT |
| (C41) BLOWER SWITCH POSITION SIGNAL CIRCUIT SHORTED TO GROUND |
| (C41) BLOWER SWITCH POSITION SIGNAL CIRCUIT OPEN |
| A/C STATUS INDICATOR INOPERATIVE |
| A/C HEATER CONTROL |