77-EBL Output Shorted High: Notes

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.

Fig 1: Defogger Relay Control Circuit Diagram

Courtesy of DAIMLERCHRYSLER CORP.

For the Manual Temperature Control (MTC) circuit diagram (Refer to HEATING & AIR CONDITIONING - SCHEMATICS AND DIAGRAMS) .

For a complete wiring diagram refer to SYSTEM WIRING DIAGRAMS .

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.