MTC 77
77-EBL OUTPUT SHORTED HIGH77 - EBL Output Shorted High:
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
- (C115) Defogger relay control circuit shorted to battery
- EBL relay shorted
- 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. HVAC System Test (MTC)
DIAGNOSTIC TEST
1. CHECK FOR A SHORTED EBL RELAY
Turn the ignition off.
Install a known good relay in place of the EBL relay.
Turn the ignition on.
Actuate the Clear DTC function by performing the following:
- 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.
Press the EBL mode switch on.
Actuate the Display DTC function by performing the following:
- 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 indictor is not illuminated and stored DTCs when the EBL status indicator is illuminated.
Read DTCs from the A/C status indictor.
Q: Does the A/C status indicator display DTC 77?
YES: Go To 2
NO: Replace the original EBL Relay.
Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
2. CHECK THE (C115) DEFOGGER RELAY CONTROL CIRCUIT FOR A SHORT TO BATTERY
Turn the ignition off.
Remove the replacement EBL relay.
Disconnect the A/C Heater Control C1 harness connector.
Turn the ignition on.
Measure the voltage of the (C115) Defogger Relay Control circuit.
Q: Is the voltage above 0.2 volts?
YES: Repair the (C115) Defogger Relay Control circuit for a short to battery. Reinstall the original EBL relay.
Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Replace the A/C Heater Control. Reinstall the original EBL relay.
Perform BODY VERIFICATION TEST - VER 1. Body Verification Test