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Home >> Suzuki >> 2012 >> SX4 Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 75 (Air Conditioning System - Auto A/C) >> Diagnostic Information and Procedures >> DTC B1552: HVAC Control Module Check Sum Error >> DTC Troubleshooting
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DTC Troubleshooting

WARNING: This page is about a different car, the 2011 Suzuki SX4. However, it is still accessible from the selected car via links, so may be relevant.
B1552: SYMPTOM TROUBLESHOOTING REFERENCE CHART

Step Action YES NO
1  Was "Air Conditioning System Check" performed?  Go to Step 2. Go to AIR CONDITIONING SYSTEM CHECK: AUTO A/C .
2  Serial communication signal data check 
  1. Connect scan tool to DLC with ignition switch turned OFF.
  2. Start engine and select "Scan Tool Data" mode on scan tool.
  3. 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? 		 Intermittent trouble. Check for intermittent referring to INTERMITTENT AND POOR CONNECTION INSPECTION . Substitute a known-good HVAC control module and recheck. If DTC is still detected, substitute a known-good BCM and recheck.
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