Theory of Operation

The EBL mode switch input changes when the switch is pushed down. A stored DTC 34 indicates that the EBL mode switch was stuck in a pushed position for more than 10 minutes, but has since returned to its normal state. An active DTC 34 indicates that the EBL mode switch is stuck in a pushed position. An active DTC 34 will prevent the control from performing certain diagnostic functions and it will prevent proper EBL 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 EBL mode switch stays in a pushed position for more than 10 minutes.