Loopback Test Failure (Active) - Mtc - Chrysler Town and Country 2003 Owner's Manual

HEATING & A/C
Symptom:

LOOPBACK TEST FAILURE (ACTIVE) - MTC

When Monitored and Set Condition:
LOOPBACK TEST FAILURE (ACTIVE) - MTC
When Monitored: When the A/C - Heater Control Module executes an internal loopback
test.
Set Condition: If the A/C - Heater Control Module fails to send a message, or none of the
expected messages arrive for 5 seconds, an internal loopback test is executed. If the
internal loopback test fails, the DTC will set.
ADDITIONAL CODE(S) PRESENT
A/C - HEATER CONTROL MODULE
TEST
1 Turn the ignition on.
With the DRBIII , read HVAC DTCs.
Does the DRBIII display any additional HVAC DTCs?
Yes → Return to the symptom list and choose the symptom(s).
→ Replace the A/C - Heater Control Module in accordance with the
No
POSSIBLE CAUSES
ACTION
Perform BODY VERIFICATION TEST - VER 1.
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
548
APPLICABILITY
All