77–EBL OUTPUT SHORTED HIGH





For a complete wiring diagram Refer to Section 8W.


  • When Monitored:

    With the Ignition on and the EBL mode switch on.

  • Set Condition:

    If the A/C Heater Control senses excessive current on the (C115) Defogger Relay Control circuit.


Possible Causes
  
EBL RELAY SHORTED TO BATTERY
  
(C115) DEFOGGER RELAY CONTROL CIRCUIT SHORTED TO BATTERY
  
JUNCTION BLOCK
  
A/C HEATER CONTROL
  

NOTE: This DTC must be active for the results of this test to be valid. Do not perform this test if this DTC is stored. Refer to HVAC System Test (MTC) for stored DTC test procedures.



Diagnostic Test

1.CHECK THE EBL RELAY FOR A SHORT TO BATTERY






  • Turn the blower control on.
  • Press the A/C mode switch down, turn the blower control to off, wait until both LEDs illuminate (approximately 5 seconds) and then release the A/C mode switch.
  • When the A/C status indicator begins displaying DTCs, set the Mode switch to the floor position, simultaneously press the A/C mode switch and the EBL mode switch down until both LEDs start flashing (approximately 5 seconds) and then release the mode switches. Stored DTCs will clear from memory in approximately two seconds.


  • Turn the blower control on.
  • Press the A/C mode switch down, turn the blower control to off, wait until both LEDs illuminate (approximately 5 seconds) and then release the A/C mode switch.

NOTE: The A/C status indicator displays active DTCs when the EBL status indicator is not illuminated and stored DTCs when the EBL status indicator is illuminated.




Does the A/C status indicator display DTC 77?

Yes
  • Go To 2


No

2.CHECK FOR A SHORTED A/C HEATER CONTROL









Is the voltage above 0.2 volts?

Yes
  • Go To 3


No

3.CHECK THE (C115) DEFOGGER RELAY CONTROL CIRCUIT FOR A SHORT TO BATTERY








Is the voltage above 0.2 volts?

Yes


No