Heating & AC System: 77

77-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.





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. MTC

1. CHECK THE EBL RELAY FOR A SHORT TO BATTERY




1. Turn the ignition off.
2. Install a known good relay in place of the EBL relay.
3. Turn the ignition on.
4. Actuate the Clear DTC function by performing the following:
5. Press the EBL mode switch on.
6. 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.
- 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.

7. Read DTCs from the A/C status indicator.

Does the A/C status indicator display DTC 77?

Yes

- Go To 2

No

- Replace the original EBL Relay.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

2. CHECK FOR A SHORTED A/C HEATER CONTROL




1. Turn the ignition off.
2. Remove the replacement EBL relay.
3. Disconnect the A/C Heater Control C1 harness connector.
4. Turn the ignition on.
5. Measure the voltage of the (C115) Defogger Relay Control circuit.

Is the voltage above 0.2 of a Volt?

Yes

- Go To 3

No

- Replace the A/C Heater Control.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

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




1. Turn the ignition off.
2. Disconnect the Junction Block C2 harness connector.
3. Turn the ignition on.
4. Measure the voltage of the (C115) Defogger Relay Control circuit.

Is the voltage above 0.2 of a Volt?

Yes

- Repair the (C115) Defogger Relay Control circuit for a short to battery.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Replace the Junction Block.
- Perform the BODY VERIFICATION TEST. Body Verification Test.