34–EBL MODE SWITCH STUCK (MTC)

For a complete wiring diagram Refer to Section 8W.

Theory of Operation


The 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 24 - HEATING & AIR CONDITIONING - 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.


Possible Causes
  
A/C HEATER CONTROL DAMAGED
  
OBJECT HOLDING EBL MODE SWITCH IN A PUSHED POSITION
  
SUBSTANCE CAUSING EBL MODE SWITCH TO GET STUCK IN A PUSHED POSITION
  
A/C HEATER CONTROL
  



Diagnostic Test

1.INSPECT THE A/C HEATER CONTROL FOR DAMAGE



Is the A/C Heater Control damaged?

Yes


No
  • Go To 2

2.INSPECT FOR OBJECT OR SUBSTANCE CAUSING THE EBL MODE SWITCH TO STAY OR STICK IN A PUSHED POSITION



Is anything present that would cause the EBL mode switch to stay or stick in a pushed position?

Yes


No
  • Go To 3

3.CHECK FOR NORMAL EBL MODE SWITCH & STATUS INDICATOR FUNCTION




Does the EBL status indicator turn on and off with respect to the switch position?

Yes
  • Go To 4


No

4.CHECK A/C HEATER CONTROL OPERATION BY ATTEMPTING TO RUN THE ACTUATOR CIRCUIT TEST/ DOOR CALIBRATION FUNCTION


  • Turn the blower control off.
  • Press and hold the EBL mode switch down and then turn the blower control on. Continue to hold the EBL mode switch down until the EBL status indicator begins flashing. Then, release the EBL mode switch.



Did the A/C Heater Control run the test / function?

Yes


No