TX Failure (Active)

TX FAILURE (ACTIVE)

For a complete wiring diagram refer to the Wiring Information Electrical Diagrams

- When Monitored:
When the ignition is on.

- Set Condition:
This DTC will set if the A/C - Heater Control Module is unable to send a PCI Bus message.





1. ATTEMPT TO COMMUNICATE WITH THE HVAC MODULE
1. Turn the ignition on.
2. With the scan tool, attempt to communicate with the HVAC Module.

Was the scan tool able to I/D or communicate with the HVAC Module?

Yes

- Go To 2

No

- Refer to the Communication category for the related symptom(s).
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.

2. CHECK FOR ADDITIONAL HVAC DTCS
1. Turn the ignition on.
2. With the scan tool, read HVAC DTCs.

Does the scan tool display additional HVAC DTCs?

Yes

- Diagnose and repair the DTC(s).
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.

No

- Go To 3

3. ATTEMPT TO COMMUNICATE WITH THE PCM AND BCM
1. Turn the ignition on.
2. With the scan tool, attempt to communicate with the PCM.
3. With the scan tool, attempt to communicate with the BCM.

Was the scan tool able to I/D or communicate with the PCM and the BCM?

Yes

- Go To 4

No

- Refer to the Communication category for the related symptom(s).
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.

4. A/C - HEATER CONTROL MODULE
1. Turn the ignition on.
2. With the scan tool, erase HVAC DTCs.
3. Cycle the ignition switch and wait approximately 1 minute.
4. With the scan tool, read HVAC DTC's.

Did this DTC reset?

Yes

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

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. Body Verification Test.