DIAGNOSTIC ITEM 21: Diagnose When The Scan Tool Cannot Receive The Data Sent By A/C-ECU - Vehicles With A/C - Or Heater Control Unit - Vehicles Without A/C: Function
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If the scan tool MB991958 cannot communicate with the A/C-ECU < vehicles with A/C > or heater control unit < vehicles without A/C >, this diagnosis result will be set.