Diagnostic Procedure

WARNING: This page is about a different car, the 2004 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.

TX FAILURE (ACTIVE) - DIAGNOSTIC PROCEDURE

TEST	ACTION
1	Turn the ignition on. With the DRBIII(R), attempt to communicate with the HVAC Module. Was the DRBIII(R) able to I/D or communicate with the HVAC Module? Yes --> Go To 2 No --> Refer to the COMMUNICATION category and perform the appropriate symptom. Perform BODY VERIFICATION TEST - VER 1 .
2	Turn the ignition on. With the DRBIII(R), read HVAC DTCs. Does the DRBIII(R) display additional HVAC DTCs? Yes --> Return to the symptom list and choose the symptom(s). Perform BODY VERIFICATION TEST - VER 1 . No --> Go To 3
3	Turn the ignition on. With the DRBIII(R), attempt to communicate with the PCM. With the DRBIII(R), attempt to communicate with the CTM. Was the DRBIII(R) able to I/D or communicate with the PCM and the CTM? Yes --> Go To 4 No --> Refer to the COMMUNICATION category and perform the appropriate symptom. Perform BODY VERIFICATION TEST - VER 1 .
4	Turn the ignition on. With the DRBIII(R), erase HVAC DTCs. Cycle the ignition switch and wait approximately 1 minute. With the DRBIII(R), read HVAC DTCs. Did this DTC reset? Yes --> Replace the A/C - Heater Control Module in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1 . No --> Using the wiring diagram/schematic as a guide, inspect the wiring and connectors to help isolate a possible intermittent wiring condition. Perform BODY VERIFICATION TEST - VER 1 .