Chevrolet Impala VIII (1999-2006) (under dash, to right of steering column) Wiring diagrams

AJAR SWITCH BCM FUSE BLK WIRE BLK/WHT WIRE BODY CONTROL MODULE (BEHIND LEFT SIDE OF DASH, ABOVE PARKING BRAKE LEVER) CLASS 2 DATA LINE CLASS 2 SERIAL DATA CLSTR/BCM FUSE DATA DK BLU WIRE DK BLU/WHT WIRE DK GRN WIRE DK LK FUSE DOOR AJAR IN ACCY SIG IN DRIVER DOOR AJAR IN KEY SWITCH SIGNAL EXTERIOR LIGHTS, INTERIOR LIGHTS SYSTEMS FRONT PASSENGER DOOR LOCK CYLINDER SWITCH GRY WIRE HEADLIGHTS SYSTEM HORNS SYSTEM HOT AT ALL TIMES HOT IN ACC OR ON HOT IN ACC, ON OR START HOT IN ON OR START IGNITION LOCK CYLINDER INSTRUMENT PANEL CLUSTER (IPC) KEYLESS ENTRY SERIAL DATA LEFT FRONT DOOR LOCK LEFT FRONT DOOR LOCK CYLINDER SWITCH LEFT FRONT DOOR LOCK SWITCH LEFT I/P JUNCTION BLOCK (LEFT SIDE OF DASH, BEHIND ACCESS PANEL) LEFT REAR DOOR LOCK (INSIDE AJAR SWITCH LEFT REAR DOOR) LH HTD ST/BCM FUSE LOCK LOCK UNLOCK LOGIC LT GRN WIRE MESSAGE CENTER NCA WIRE ORG/ WIRE ORG/BLK WIRE PASSLOCK SENSOR PCM/BCM CLSTR FUSE PNK PNK WIRE PNK WIRE POWER DISTRIBUTION SYSTEM POWERTRAIN CONTROL MODULE (PCM) (IN AIR CLEANER BOX) PPL PPL (LEFT SIDE OF DASH) PPL PPL REAR COMPARTMENT LID AJAR SWITCH RED/BLK WIRE REMOTE CONTROL DOOR LOCK RECEIVER (RCDLR) (ON UPPER CENTER OF DASH) RIGHT FRONT DOOR LOCK RIGHT FRONT DOOR LOCK SWITCH RIGHT I/P JUNCTION BLOCK RIGHT I/P JUNCTION BLOCK (RIGHT SIDE OF DASH, BEHIND ACCESS PANEL) RIGHT REAR DOOR LOCK SECURITY INDICATOR STOP FUSE UNLOCK W/ SEO WHT WIRE YEL WIRE

1317 1969 FOG LAMP RLY CTRL HEADLAMP RLY CTRL 389 1844 192 VEHICLE SPEED SIG PK BRAKE IND SUPPLY VOLTAGE FRONT FOG LAMP SW SIG 727 74 DOOR OPEN SW SIG PARK LAMP SW SIG 762 43 A/C REQUEST SIG ACCESSORY VOLTAGE AIR CONDITIONING SYSTEM BCM FUSE BLK WIRE BLK/WHT WIRE BODY CONTROL MODULE (BEHIND LEFT SIDE OF DASH, ABOVE PARKING BRAKE LEVER) BRN/WHT WIRE CLASS 2 SERIAL DATA GROUND GROUND DRL RLY CTRL CLSTR/ BCM FUSE COMPUTER DATA LINES SYSTEM COURTESY LAMP LOW CTRL KEYLESS ENTRY SERIAL DATA IGNITION 0 VOLTAGE COURTESY LAMP RLY CTRL PARK LAMP RLY CTRL BATTERY POSITIVE VOLTAGE CRUISE CONTROL SYSTEM INSTRUMENT CLUSTER SYSTEM HEADLIGHTS SYSTEM DK BLU WIRE DK BLU/WHT WIRE DK GRN WIRE DK GRN/WHT WIRE DOOR LOCKS SYSTEM EXTERIOR LIGHTS SYSTEM DR LK FUSE GRY WIRE HEADLIGHTS SYSTEM HEADLIGHTS SYSTEM DOOR LOCKS SYSTEM HEADLIGHTS SYSTEM HEADLIGHTS SYSTEM HEADLIGHTS SYSTEM HORNS SYSTEM EXTERIOR LIGHTS SYSTEM HOT AT ALL TIMES HOT IN ACC OR ON HOT IN ACC, ON OR START HOT IN ON OR START INTERIOR LIGHTS SYSTEM DOOR LOCKS SYSTEM INTERIOR LIGHTS SYSTEM EXTERIOR LIGHTS SYSTEM LEFT I/P JUNCTION BLOCK (LEFT SIDE OF DASH, BEHIND ACCESS PANEL) LH HTD ST/BCM FUSE LT BLU WIRE LT GRN WIRE LT GRN/BLK WIRE ORG/ WIRE ORG/BLK WIRE PCM/BCM CLUSTER FUSE PNK PNK WIRE PNK WIRE POWER DISTRIBUTION SYSTEM PPL PPL PPL RED/BLK WIRE STOP FUSE TAN WIRE TAN/WHT WIRE TRUNK, TAILGATE, FUEL DOORS SYSTEM ANTI-THEFT SYSTEM TRUNK, TAILGATE, FUEL DOORS SYSTEM DOOR LOCKS SYSTEM WHT WIRE YEL WIRE YEL/BLK WIRE

ABOVE PARKING BRAKE LEVER) BLK WIRE BLK/WHT WIRE BLU WIRE BODY CONTROL MODULE (BEHIND LEFT SIDE OF DASH) CLSTR/BCM FUSE DASH, BEHIND ACCESS PANEL) POWER DISTRIBUTION SYSTEM DATA CLASS 2 DATA LINK CONNECTOR (DLC) (BELOW LEFT SIDE OF DASH, RIGHT OF STEERING COLUMN) DIGITAL RADIO RECEIVER (IF EQUIPPED) (RIGHT REAR OF WHEELWELL) DK BLU WIRE DK DK DK GRN WIRE DRIVER INFORMATION CENTER (DIC) (IF EQUIPPED) EXCEPT POLICE VEHICLE, TAXI GRY WIRE HOT AT ALL TIMES HVAC CONTROL MODULE (MIDDLE CENTER OF DASH) INFLATABLE RESTRAINT SENSING, DIAGNOSTIC MODULE (SDM) (BELOW PASSENGER'S SEAT) INSTRUMENT PANEL CLUSTER (IPC) LEFT I/P JUNCTION BLOCK (LEFT SIDE OF LT BLU WIRE LT GRN WIRE ONSTAR MODULE (W/ VEHICLE COMMUNICATION SYSTEM) ORG/ WIRE POWERTRAIN CONTROL MODULE (PCM) (IN AIR CLEANER BOX) PPL RADIO WHT WIRE YEL WIRE

ABOVE PARKING BRAKE LEVER) BLK WIRE BLK/WHT WIRE BODY CONTROL MODULE (BEHIND LEFT SIDE OF DASH) BRN WIRE DRIVER OUTSIDE REARVIEW MIRROR GRN WIRE HOT AT ALL TIMES HOT IN ON A/C CRUISE FUSE HTD MIR FUSE HVAC CONTROL MODULE LEFT I/P JUNCTION BLOCK LEFT I/P JUNCTION BLOCK (LEFT SIDE OF DASH, BEHIND ACCESS PANEL) LOAD MANAGEMENT CONTROL LOGIC IGN REAR DEFOG RLY CTRL NCA WIRE ORG/ WIRE PASSENGER OUTSIDE REARVIEW MIRROR PNK WIRE RADIO ANTENNA MODULE (ON UPPER PORTION OF LEFT "C" PILLAR) REAR DEFOG CIRCUIT BREAKER REAR DEFOG RELAY REAR DEFOGGER MOMENTARY SWITCH REAR WINDOW REAR WINDOW DEFOGGER GRID RED WIRE RIGHT I/P JUNCTION BLOCK (RIGHT SIDE OF DASH, BEHIND ACCESS PANEL) RT IP 3 FUSE UNDERHOOD JUNCTION BLOCK (BOTTOM) (ON FRONT OF RIGHT STRUT TOWER) WHT WIRE

BEHIND ACCESS PANEL) BLK WIRE BLU WIRE BODY CONTROL MODULE (BEHIND LEFT SIDE OF DASH, ABOVE PARKING BRAKE LEVER) BRAKE SW FUSE BRN WIRE BRN/WHT WIRE CENTER HIGH MOUNTED STOP LAMP (CHMSL) CRUISE CONTROL SYSTEM ANTI-LOCK BRAKES SYSTEM DK BLU WIRE DK GRN WIRE DK LT FRONT PARK LP FUSE GRY WIRE HAZ SW FUSE HAZARD HAZARD NORMAL HAZARD SIG SW OUT HAZARD SWITCH HEAD HEADLAMP SWITCH HOT AT ALL TIMES HOT IN RUN OR START ILLUM INSTRUMENT PANEL CLUSTER (IPC) INTERIOR LIGHTS LEFT HEADLAMP LEFT I/P JUNCTION BLOCK LEFT I/P JUNCTION BLOCK (LEFT SIDE LEFT I/P JUNCTION BLOCK (LEFT SIDE OF DASH, LEFT LICENSE LAMP RIGHT LICENSE LAMP LEFT TAIL LAMP PARK TURN/ STOP LEFT TURN INDICATOR LOGIC LEFT TURN INPUT LOGIC LT BLU WIRE OF DASH, BEHIND ACCESS PANEL) OFF ORG/ WIRE PANEL) PARK PARK LP RELAY PARK TURN LEFT FRONT PARK/ TURN LAMP PNK WIRE POWER DISTRIBUTION SYSTEM PPL REAR PARK LP FUSE RED WIRE RIGHT HEADLAMP RIGHT I/P JUNCTION BLOCK (RIGHT SIDE OF DASH, BEHIND ACCESS RIGHT I/P JUNCTION BLOCK (RIGHT SIDE OF DASH, BEHIND ACCESS PANEL) RIGHT TAIL LAMP PARK TURN/ STOP RIGHT TURN INDICATOR RIGHT TURN INPUT STOPLAMP SWITCH (ON BRAKE PEDAL SUPPORT) TURN PARK RIGHT FRONT PARK/ TURN LAMP TURN SIG SW OUT TURN SIGNAL FUSE TURN SIGNAL/ MULTI- FUNCTION RIGHT SWITCH (IN LEFT STEERING COLUMN) WHT WIRE YEL WIRE

17 18 STOP LMP SIG LR LAMP PWR RR LAMP PWR B/U LMP PWR GROUND ANTI-LOCK BRAKES SYSTEM AUX PWR FUSE BACK-UP LAMPS CIRUIT BACK-UP LAMPS CIRUIT 1750 340 BLK WIRE BLOCK (LEFT SIDE OF DASH, BEHIND ACCESS PANEL) BLU WIRE BLUNT CUT) BODY CONTROL MODULE (BEHIND LEFT SIDE OF DASH, ABOVE PARKING BRAKE LEVER) BRAKE SW FUSE BRN WIRE BRN/WHT WIRE CENTER HIGH MOUNTED STOP LAMP (CHMSL) RIGHT TAIL LAMP CRUISE CONTROL SYSTEM DK BLU WIRE DK GRN WIRE DK LT EMERGENCY VEHICLE REAR LAMPS FLASHER (UPPER RIGHT FRONT OF REAR COMPARTMENT) FRONT PARK LP FUSE GRN DK WIRE GRY WIRE HAZ SW FUSE HAZARD HAZARD NORMAL HAZARD SIG SW OUT HAZARD SWITCH HEAD HOT AT ALL TIMES HOT AT ALL TIMES UNDERHOOD JUNCTION BLOCK (TOP) RT I/P 1 FUSE HOT IN RUN OR START ILLUM INDICATOR LEFT TURN INDICATOR RIGHT TURN INPUT INSTRUMENT PANEL CLUSTER (IPC) INTERIOR LIGHTS LEFT EMERGENCY VEHICLE REAR WINDOW PANEL LAMP LEFT HEADLAMP LEFT I/P JUNCTION LEFT I/P JUNCTION BLOCK LEFT I/P JUNCTION BLOCK (LEFT SIDE OF DASH, BEHIND ACCESS PANEL) LEFT LICENSE LAMP LEFT TAIL LAMP LEFT TURN LOGIC LT BLU WIRE LT GRN WIRE NCA WIRE OFF HEADLAMP SWITCH ORG/ WIRE PANEL) PARK PARK LP RELAY PARK TURN LEFT FRONT PARK/ TURN LAMP PARK TURN/ STOP PNK WIRE PPL REAR PARK LP FUSE RED WIRE RIGHT (IN LEFT STEERING COLUMN) RIGHT EMERGENCY VEHICLE REAR WINDOW PANEL LAMP RIGHT HEADLAMP RIGHT I/P JUNCTION BLOCK RIGHT I/P JUNCTION BLOCK (RIGHT SIDE OF DASH, BEHIND ACCESS PANEL) RIGHT LICENSE LAMP RIGHT TURN STOPLAMP SWITCH (ON BRAKE PEDAL SUPPORT) TURN PARK TURN/ STOP RIGHT FRONT PARK/ TURN LAMP TURN SIG SW OUT TURN SIGNAL FUSE TURN SIGNAL/ MULTI-FUNCTION SWITCH WHT WIRE YEL WIRE

AMBIENT AIR TEMPERATURE SENSOR AUXILIARY POWER DROP CONNECTOR BLK WIRE BODY CONTROL MODULE (BCM) BODY CONTROL MODULE (BCM) INSTRUMENT PANEL CLUSTER (IPC) BRAKE FLUID LEVEL SWITCH CIGAR LIGHTER DATA LINK CONNECTOR (DLC) DRIVER DOOR LOCK DRIVER DOOR LOCK SWITCH FOG LAMP SWITCH FRONT PASSENGER DOOR LOCK FUEL PUMP RELAY HAZARD SWITCH HEADLAMP DIMMER SWITCH HEADLAMP SWITCH HVAC CONTROL MODULE AUXILIARY POWER OUTLET ASHTRAY LAMP IGNITION RELAY IGNITION SWITCH IMPALA IMPALA LS/ MONTE CARLO SS INFLATABLE RESTRAINT STEERING WHEEL MODULE COIL INSTRUMENT PANEL CLUSTER (IPC) LEFT STEERING WHEEL CONTROLS (CRUISE) LEFT STEERING WHEEL CONTROLS (RADIO) NCA WIRE RADIO REAR COMPARTMENT LID RELEASE SWITCH REMOTE CONTROL DOOR LOCK RECEIVER (RCDLR) RETAINED ACCESSORY PWR RELAY HEADLAMP RELAY RIGHT I/P JUNCTION BLOCK (RIGHT SIDE OF DASH, BEHIND ACCESS PANEL) RIGHT STEERING WHEEL CONTROLS (CRUISE) RIGHT STEERING WHEEL CONTROLS (RADIO) SEO FUSE BLOCK STEERING COLUMN) SURVEILLANCE MODE SWITCH TRACTION CONTROL SWITCH W/ SEO W/ SEO W/O SEO W/O CONSOLE W/O SEO WHT WIRE WINDSHIELD WIPER SYSTEM MODULE

AC HEADLAMP RELAY AMBIENT LIGHT SENSOR (TOP RIGHT OF DASH, NEAR DEFOGGER OUTLET) BLK WIRE BLK/WHT WIRE BLOCK (LEFT SIDE OF DASH, BEHIND ACCESS PANEL) BODY CONTROL MODULE (BCM) (BEHIND LEFT SIDE OF DASH, ABOVE PARKING BRAKE LEVER) BRN WIRE COMPUTER DATA LINES SYSTEM DK BLU WIRE DK GRN/WHT WIRE DRL RELAY DRL RELAY SERIAL DATA FOG LP RELAY HIGH BEAM IN HEADLAMP RLY DRL/EXT LTS FUSE EXT LTS FUSE FOG LAMP INDICATOR FOG LAMP SWITCH FOG LIGHT RELAY FOG LP SW PARK BRAKE IN GROUND DISTRIBUTION SYSTEM GRY WIRE HEAD HEADLAMP DIMMER SWITCH HEADLAMP SW AL SENS SIG AL SENS REF 1138 1137 HEADLAMP SWITCH HIGH BEAM HIGH BEAM IND HIGH BEAM OUT HOT AT ALL TIMES IPC CLASS 2 SERIAL DATA LEFT FRONT FOG LAMP LEFT HEADLAMP LEFT I/P JUNCTION LEFT I/P JUNCTION BLOCK (LEFT SIDE OF DASH, BEHIND ACCESS PANEL) LOGIC INSTRUMENT PANEL CLUSTER (IPC) LOW BEAM LT BLU WIRE LT GRN WIRE LT GRN/BLK WIRE MESSAGE CENTER OFF ORG/ WIRE PARK PARK BRAKE SWITCH (AT BASE OF PARKING BRAKE ASSEMBLY) PNK PNK WIRE PNK WIRE PPL RIGHT FRONT FOG LAMP RIGHT HEADLAMP LOW BEAM TURN SIGNAL/ MULTIFUNCTION SWITCH UNDERHOOD JUNCTION BLOCK (TOP) UNDERHOOD JUNCTION BLOCK (TOP) (ON FRONT OF RIGHT STRUT TOWER) UNDERHOOD JUNCTION BLOCK (TOP) FOG RLY FUSE YEL WIRE YEL/BLK WIRE

AC HEADLAMP RELAY AMBIENT LIGHT SENSOR (TOP RIGHT OF DASH, NEAR DEFOGGER OUTLET) BLK WIRE BLK/WHT WIRE BLOCK (LEFT SIDE OF DASH, BEHIND ACCESS PANEL) BLUNT CUT WIRE PNK BODY CONTROL MODULE (BEHIND LEFT SIDE OF DASH, ABOVE PARKING BRAKE LEVER) BRN WIRE COMPUTER DATA LINES SYSTEM DK BLU WIRE DK GRN/WHT WIRE DRL RELAY DRL RELAY SERIAL DATA FOG LP RELAY HIGH BEAM IN HEADLAMP RLY DRL/EXT LTS FUSE EMERGENCY VEHICLE HEADLAMPS FLASHER (FORWARD OF RADIATOR SUPPORT) EXT LTS FUSE FOG LAMP INDICATOR FOG LAMP SWITCH FOG LIGHT RELAY FOG LP SW PARK BRAKE IN FOG RLY FUSE GROUND DISTRIBUTION SYSTEM GRY WIRE HEAD HEADLAMP DIMMER SWITCH HEADLAMP SW AL SENS SIG AL SENS REF 1138 1137 HEADLAMP SWITCH HIGH BEAM HIGH BEAM IND MESSAGE CENTER HIGH BEAM OUT HOT AT ALL TIMES INSTRUMENT PANEL CLUSTER (IPC) IPC CLASS 2 SERIAL DATA LEFT FRONT FOG LAMP LEFT HEADLAMP LEFT I/P JUNCTION LEFT I/P JUNCTION BLOCK (LEFT SIDE OF DASH, BEHIND ACCESS PANEL) LOGIC LOW BEAM LT BLU WIRE LT GRN WIRE LT GRN/BLK WIRE NCA WIRE OFF ORG/ WIRE PARK PARK BRAKE SWITCH (AT BASE OF PARKING BRAKE ASSEMBLY) PNK PNK WIRE PNK WIRE PPL RIGHT FRONT FOG LAMP RIGHT HEADLAMP LOW BEAM TURN SIGNAL/ MULTIFUNCTION SWITCH (IN STEERING COLUMN) UNDERHOOD JUNCTION BLOCK (TOP) YEL WIRE YEL/BLK WIRE

39 26 27 34 COMP CONTROL ECT SIGNAL A/C PRESS SIGNAL 59 5 6 13 80 CLASS 2 SERIAL HIGH SPEED LOW SPEED ECT GROUND LOW REFERENCE A/C CMPR RELAY A/C COMPRESSOR CLUTCH A/C REFRIGERANT PRESSURE SENSOR (ON LEFT SIDE OF ENGINE COMPT, ON LIQUID LINE) A/C REQUEST IND A/C REQUEST SIG A/C REQUEST SWITCH A/C RLY (CMPR) FUSE A/C RLY (COIL) FUSE BATTERY POSITIVE BLK WIRE BLK/WHT WIRE BLOWER MOTOR BLOWER MOTOR (ON RIGHT BOTTOM OF HEATER-A/C ASSEMBLY) BLOWER MOTOR CONTROL PROCESSOR (LOWER RIGHT SIDE OF DASH) BODY CONTROL MODULE (BEHIND LEFT SIDE OF DASH, ABOVE PARKING BRAKE LEVER) BREAKOUT) BREAKOUT) (3.8L (VIN K): LEFT REAR OF ENGINE, 6.5 CM FROM EGR VALVE BREAKOUT) BRN WIRE COMPUTER DATA LINES SYSTEM D TEMP CONTROL SWITCH DEFOG SWITCH DEFOGGER SYSTEM COMPUTER DATA LINES SYSTEM DK BLU WIRE DK BLU/WHT WIRE DK GRN WIRE DK GRN/WHT WIRE DR CTRL A DR CTRL B DR CTRL A DR CTRL B DOOR CTRL A DOOR CTRL B ENGINE CONTROLS SYSTEM ENGINE COOLANT TEMPERATURE FAN CONT 1 FUSE FAN CONT 1 RELAY FAN CONT 2 RELAY FAN CONT 2, 3 FUSE FAN CONT 3 RELAY GROUND GRY WIRE GRY/BLK WIRE HOT AT ALL TIMES HOT IN ON HVAC BLOWER FUSE HVAC CLASS 2 SERIAL DATA HVAC CLASS 2 SERIAL DATA BATTERY ILLUM LEFT AIR TEMPERATURE ACTUATOR (ON LEFT SIDE OF HEATER- A/C ASSEMBLY) LEFT COOLING FAN (FRONT OF ENGINE COMPT) LT BLU WIRE LT GRN WIRE LT GRN/BLK WIRE MODE ACTUATOR (LOWER RIGHT SIDE OF DASH) MODE SWITCH NCA WIRE ORG/ WIRE ORG/BLK WIRE OUT SIDE AIR IND OUT SIDE AIR SWITCH P TEMP CONTROL SWITCH PNK IGN 3 VOLT GROUND WIRE PNK WIRE PNK/WHT WIRE POWER DISTRIBUTION SYSTEM PPL REAR DEFOG RLY CTRL RECIRCULATION ACTUATOR RECIRCULATION IND RECIRCULATION SWITCH RED WIRE RED/BLK WIRE RIGHT AIR TEMPERATURE ACTUATOR (ON RIGHT SIDE OF HEATER- A/C ASSEMBLY) RIGHT COOLING FAN (FRONT OF ENGINE COMPT) S121 (3.4L (VIN E)) (FUEL INJECTOR JUMPER SPEED CTRL SPEED CTRL DOOR CTRL POSITION SIG STARTER SUPPLY VOLTAGE TAN WIRE UNDERHOOD JUNCTION BLOCK (TOP) (ON FRONT OF RIGHT STRUT TOWER) VOLTAGE WHT WIRE WHT/BLK WIRE YEL WIRE