U0425-IMPLAUSIBLE DATA RECEIVED FROM AUXILARY HEATER CONTROL MODULE

For a complete wiring diagram, refer to the Wiring Information.

When Monitored:
Continuously while the system is active.
Set Condition:
The Powertrain Control Module (PCM) recieves a CAN BUS message from the Totally Integrated Power Module (TIPM) for implausible data received from the Cabin Heaters.

Possible Causes
CAN BUS OPEN OR SHORTED CONDITION
CABIN HEATERS
TOTTALY INTEGRATED POWER MODULE (TIPM)
POWERTRAIN CONTROL MODULE (PCM)

1. ACTIVE DTC

NOTE: Diagnose all CAN B and C communication DTCs before continuing.

1.	Ignition on, engine not running.

2.	With a scan tool, view DTCs.

Is the status Active for this DTC?

Yes

2. CHECK FOR CABIN HEATER DTCs IN THE TIPM

1.	With the scan tool, read DTCs in the TIPM.

Are there any Cabin Heater DTCs present in the TIPM?

Yes

(Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Diagnosis and Testing) and perform the diagnostic procedure for the Cabin Heater DTC present in the TIPM.

3. HVAC COMMUNICATION RELATED DTCs IN OTHER MODULES

1.	With the scan tool, select Network Diagnostics.

Is there more than one module with active DTCs “Logged Against” the PCM at this time?

Yes

Replace and program the Powertrain Control Module in accordance with the service information.
Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).

Replace and program the TIPM in accordance with the service information.
Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure).