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HOMESERVICE MANUALSSUZUKI2012KIZASHI SPORT GTS, 4WDREPAIR AND DIAGNOSIS (SINGLE PAGE)HEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSAIR CONDITIONING SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC B1550-H/B1550-L: LOST COMMUNICATION BETWEEN HVAC CONTROL MODULE AND AUTO A/C PANELDTC TROUBLESHOOTING
2012 Suzuki Kizashi Sport GTS, 4WD

DTC Troubleshooting

2012 Suzuki Kizashi Sport GTS, 4WDSECTION DTC Troubleshooting
DTC TROUBLESHOOTING CHART

Step Action YES NO
1  DTC CHECK 
  1. Push engine switch to change ignition mode to "ON".
  2. Push engine switch to change ignition mode to "OFF".
  3. Push engine switch to change ignition mode to "ON" and check DTC.

Is DTC B1550-H or B1550-L still detected? 		 Go to Step 2. Intermittent trouble.
2  Communication circuit check 
  1. Disconnect "G20" and auto A/C panel connectors.
  2. Check the following points.
    • Resistance of "RED/GRN" wire circuit: less than 1 Ω
    • Resistance of "RED/GRN" wire circuit between auto A/C panel and ground: infinity

Are they in good condition? 		 Replace HVAC control module and recheck DTC, see HVAC CONTROL MODULE REMOVAL AND INSTALLATION . Repair or replace defective wire harness.
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.