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Home >> Hummer >> 2009 >> H3 Base, Standard >> Repair and Diagnosis >> Accessories & Equipment >> Cruise Control Systems >> Diagnostic Information and Procedures >> DTC P1574 >> Circuit/System Verification

Circuit/System Verification

Ignition ON, observe the TCC/Cruise Brake Pedal Switch parameter while applying and releasing the brake pedal. The reading should change between Applied/Released and all brake lights should turn ON and OFF accordingly.