B1552

DTC B1552: HVAC Control Module Check Sum Error

DTC Detecting Condition and Trouble Area






DTC Troubleshooting

1.
Was "Air Conditioning System Check" performed?
YES -
Go to Step 2.
NO -
Go to Air Conditioning System Check Air Conditioning System Check:Auto A/C.

2. Serial communication signal data check

Connect scan tool to DLC with ignition switch turned OFF.
Start engine and select "Scan Tool Data" mode on scan tool.
Check "Refrigerant Pressure", "Vehicle Speed", "ECT" and "Outside Air Temp" displayed on scan tool.

Are values of A/C refrigerant pressure sensor displayed in "Scan Tool Data" and outside air temperature displayed in "Scan Tool Data" within specified ranges?
YES -
Intermittent trouble.
Check for intermittent referring to Intermittent and Poor Connection Inspection Intermittent and Poor Connection Inspection.
NO -
Substitute a known-good HVAC control module and recheck.
If DTC is still detected, substitute a known-good BCM and recheck.