DTC B1544
Precautions: Precautions for Diagnosing Trouble · General safety (00)
DTC Detecting Condition and Trouble Area
| DTC detecting condition | Trouble area |
|---|---|
|
B1544: Invalid Data between HVAC Control Module and Auto A/C Panel
•HVAC control module sent invalid signal to auto A/C panel.
•HVAC control module received invalid signal from auto A/C panel. |
•Auto A/C panel
•HVAC control module |
DTC Confirmation Procedure
1)Start engine and operate A/C system.
DTC Troubleshooting
| Step | Action | Yes | No |
|---|---|---|---|
| 1 |
DTC check
1)Set ignition “ON”.
2)Set ignition “OFF”.
3)Set ignition “ON” and check for DTC.
Is DTC B1544 still detected?
|
Replace HVAC control module and/or auto A/C panel and recheck DTC.
•HVAC control module:
 •Auto A/C panel: |
Intermittent trouble.
|