Loopback Failure (ATC)

LOOPBACK FAILURE (ATC)

For a complete wiring diagram Consult Diagrams/Electrical

- When Monitored:
When the A/C Heater Control executes an internal loop-back test.

- Set Condition:
If the A/C Heater Control fails to receive a known message while in loop-back mode.





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 (ATC) for stored DTC test procedures.

Diagnostic Test

1. REPLACE THE A/C HEATER CONTROL


Repair

- Replace the A/C Heater Control.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.