Chevrolet Avalanche I (2001-2006) Supplemental brake assist circuit

BLK WIRE BLK/WHT WIRE DK BLU WIRE DK GRN/WHT WIRE ENGINE ON SIGNAL GENERATOR GRD HOT IN RUN OR START I/P RELAY BLOCK (NEAR LEFT KICK PANEL) IGN 1 VOLT INSTRUMENT CLUSTER SYSTEM PNK WIRE PRESSURE DIFFERENTIAL SWITCH SBA FUSE SUPPLEMENTAL BRAKE ASSIST PUMP MOTOR (ON POWER BRAKE BOOSTER) SUPPLEMENTAL BRAKE SIG UNDERHOOD FUSE BLOCK (AT LEFT SIDE OF ENGINE COMPT) VACUUM PUMP MOTOR VEHICLE SPD SIG