Chevrolet Tahoe II (1999-2006) logic Wiring diagrams

ABS FUSE ANTI-LOCK IND BLK WIRE BLK/WHT WIRE BRAKE FLUID LEVEL SWITCH (2500 SERIES) (ON LEFT SIDE OF BRAKE FLUID RESERVOIR) BRAKE IND BRAKE PRESSURE DIFFERENTIAL SWITCH (1500 SERIES) (BELOW MASTER CYLINDER) BRN WIRE BRN/WHT WIRE DEL TORQUE DK GRN WIRE DK GRN/WHT WIRE ELECTRONIC BRAKE CONTROL MODULE (EBCM) (ON LEFT REAR FRAME RAIL) EXCEPT SEO GRY WIRE HOT AT ALL TIMES HOT IN RUN LEFT I/P FUSE BLOCK (BEHIND LOWER LEFT SIDE OF DASH) BRAKE FUSE HOT IN RUN OR START IGN E FUSE IGNITION 3 VOLTAGE LEFT FRONT SENSOR (-) RIGHT FRONT SENSOR (+) DELIVERED TORQUE ILLUM LAMP INSTRUMENT CLUSTER LEFT FRONT WHEEL SPEED SENSOR LOGIC LT BLU WIRE LT GRN/BLK WIRE NCA WIRE ORG/BLK WIRE PNK WIRE POWERTRAIN OR ENGINE CONTROL MODULE (PCM OR ECM) (AT LEFT FRONT OF ENG COMPT) PPL PPL 1500: BRAKE PRESS SENS SIG 2500: BRAKE FLUID LEVEL SW PPL DATA LINK CONNECTOR (DLC) (UNDER LEFT SIDE OF DASH, BELOW STEERING COLUMN) PPL/WHT WIRE RED WIRE REQ TORQUE RIGHT FRONT WHEEL SPEED SENSOR SEO SEO IGN FUSE STOPLAMP SWITCH (ON TOP OF BRAKE PEDAL BRACKET) TAN WIRE TAN/BLK WIRE TCC BRAKE SW TRACTION CONTROL IND TRACTION CONTROL SWITCH (IF EQUIPPED) TRANSFER CASE SHIFT CONTROL MODULE UNDERHOOD FUSE BLOCK (AT LEFT SIDE OF ENG COMPT, NEAR BATTERY) UNDERHOOD FUSE BLOCK (AT LEFT SIDE OF ENGINE COMPT, NEAR BATTERY) VEHICLE SPEED SENSOR (VSS) (RIGHT REAR OF TRANSMISSION) VSS HIGH VSS LOW VSS OUT YEL WIRE YEL/BLK WIRE

ABS IND. ANTI-THEFT SYSTEM BATTERY BLK WIRE BLK/WHT WIRE BODY CONTROL MODULE (ON LOWER LEFT SIDE OF DASH, BELOW STEERING COLUMN) BRAKE FLUID LEVEL SWITCH (ON LEFT SIDE OF BRAKE FLUID RESERVOIR) BRAKE IND BRAKE PRESSURE DIFFERENTIAL SWITCH (BELOW MASTER CYLINDER) BRN WIRE CRUISE FUSE DATA LINK CONNECTOR (DLC) (BELOW STEERING COLUMN) DK BLU WIRE DK GRN WIRE GROUND GRY WIRE HOT IN RUN HOT IN RUN OR START IGN E FUSE INSTRUMENT PANEL CLUSTER LEFT I/P FUSE BLOCK (ON LOWER LEFT SIDE OF DASH) LO REF LOGIC LT BLU WIRE LT GRN WIRE PNK WIRE PPL SEO IGN FUSE STEERING WHEEL POS MARKER PULSE SIG STEERING WHEEL POSITION SENS SIG STEERING WHEEL POSITION SIG A STEERING WHEEL POSITION SIG B STEERING WHEEL SPEED/ POSITION SENSOR (NEAR BASE OF STEERING COLUMN) THEFT DETERRENT CONTROL MODULE TRACTION CONTROL SWITCH TRANSFER CASE SHIFT CONTROL MODULE UNDERHOOD FUSE BLOCK (AT LEFT SIDE OF ENG COMPT, NEAR BATTERY) WHT WIRE YAW RATE FREQUENCY YAW, LATERAL ACCELERATION SENSOR (UNDER RIGHT FRONT SEAT) YEL WIRE

A/C COMP CL RLY CTRL A/C COMPRESSOR CLUTCH A/C COMPRESSOR CLUTCH RELAY A/C LOW PRESSURE SWITCH (RIGHT SIDE OF ACCUMULATOR) A/C ON A/C RECIRC A/C REF PRE SENS SIG A/C REFRIGERANT PRESSURE SENSOR (IN HIGH SIDE PRESSURE LINE) AMBIENT AIR TEMPERATURE SENSOR (IN RIGHT FRONT BUMPER FILLER ASSEMBLY AUTO BLK WIRE BLK/WHT WIRE BLOWER FUSE BLOWER MOTOR (RIGHT SIDE OF DASH) BLOWER MOTOR CONTROL PROCESSOR (BEHIND RIGHT SIDE OF DASH) BRN WIRE BRN/WHT WIRE CLASS 2 SER DATA CLASS 2 SERIAL DATA DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE FAN DN FAN UP FRT DEF GROUND GROUND TEMP SEN ASS CTRL BLOWER SPEED CTRL GRY WIRE GRY/BLK WIRE HOT AT ALL TIMES HOT AT ALL TIMES A/C COMP FUSE HOT IN HOT IN RUN OR START IGN E FUSE HVAC 1 FUSE HVAC CONTROL MODULE (BEHIND CENTER OF DASH) HVAC/ ECAS FUSE I/P RELAY BLOCK (LEFT SIDE OF DASH) INSIDE AIR TEMPERATURE SENSOR ASSEMBLY (IN HEADLINER ABOVE DRIVER) INST LAMP DIM CTRL GROUND LEFT I/P FUSE BLOCK (LOWER LEFT SIDE OF DASH) LEFT TEMP CONTROL LO PRESS SENS SIG RT TEMP DOOR CTRL LT TEMP DOOR CTRL LOGIC LOW REF LOWER LEFT AIR TEMPERATURE SENSOR (LEFT END OF HVAC MODULE) LOWER RIGHT AIR TEMPERATURE SENSOR (BOTTOM OF HVAC MODULE) LT BLU WIRE LT BLU/BLK WIRE LT GRN WIRE LT GRN/BLK WIRE MODE MODE DOOR CTRL MODE DOOR CTRL IGN 3 LOW REF B(+) OFF ORG/ WIRE POWERTRAIN CONTROL MODULE OR ENGINE CONTROL MODULE (LEFT FRONT OF ENGINE COMPT) PPL PPL/WHT WIRE RECIR RECIR DOOR CTRL RT TEMP DOOR CTRL LT TEMP DOOR CTRL RED WIRE RED/BLK WIRE RIGHT I/P FUSE BLOCK (LOWER RIGHT SIDE OF DASH) RIGHT TEMP CONTROL RUN WIRE SPEED CTRL B(+) GROUND TAN WIRE UNDERHOOD FUSE BLOCK (LEFT SIDE OF ENGINE COMPT, NEAR BATTERY) UPPER LEFT AIR TEMPERATURE SENSOR (BELOW DASH TRIM PANEL) UPPER RIGHT AIR TEMPERATURE SENSOR (BELOW DASH TRIM PANEL) WHT WIRE WHT/BLK WIRE YEL WIRE

11 12 PPL AMBIENT LIGHT SENS LO REF AMBIENT LIGHT SENS SIG RIGHT SUNLOAD SENSOR SIG LEFT SUNLOAD SENSOR SIG AMBIENT LIGHT SENSOR BLK WIRE BODY CONTROL MODULE (LOWER LEFT SIDE OF DASH, BELOW STEERING COLUMN) BRN WIRE CLASS 2 SERIAL DATA DK BLU WIRE DK GRN WIRE GRY WIRE LEFT AIR TEMPERATURE ACTUATOR (BOTTOM OF HVAC MODULE) LEFT SOLAR SENSOR LOGIC LT BLU WIRE LT BLU/BLK WIRE LT BLU/WHT WIRE LT GRN WIRE MODE ACTUATOR (LEFT SIDE OF HVAC MODULE) PPL RECIRCULATION ACTUATOR (UPPER RIGHT OF HVAC MODULE) RIGHT AIR TEMPERATURE ACTUATOR (TOP OF HVAC MODULE) RIGHT I/P FUSE BLOCK (LOWER RIGHT SIDE OF DASH) RIGHT SOLAR SENSOR SUNLOAD SENSOR ASSEMBLY (TOP CENTER OF DASH) TAN WIRE WHT WIRE WHT/BLK WIRE YEL WIRE

AIR TEMP DOOR SIG MODE DOOR SIG AUXILIARY AIR TEMPERATURE ACTUATOR (ON AUXILIARY HVAC MODULE ASSEMBLY) AUXILIARY BLOWER MOTOR CONTROL PROCESSOR (BELOW AUXILIARY BLOWER MOTOR) AUXILIARY HVAC CONTROL MODULE (RIGHT REAR OF VEHICLE) AUXILIARY MODE ACTUATOR (ON AUXILIARY HVAC MODULE ASSEMBLY) AUXILIARYBLOWER MOTOR B(+) CLASS 2 SERIAL DATA BLK WIRE BLK/WHT WIRE BLOWER CONTROL BRN WIRE BRN/WHT WIRE COMPUTER DATA LINES SYSTEM DK BLU WIRE DK/BLU WIRE ECC FUSE FRONT AUXILIARY HVAC CONTROL ASSEMBLY FT BLOW MT SW CTRL FT MODE SW SIG GROUND GROUND AIR TEMP DOOR CTRL FT MODE SW SIG B(+) CLASS 2 SER DATA GROUND GROUND LO AIR TEMP SEN SIG BLOWER MT SP CTRL GROUND GROUND LOW REF GRY WIRE GRY/BLK WIRE HOT AT ALL TIMES HOT IN I/P RELAY BLOCK (LOWER LEFT SIDE OF DASH) IGN 3 FUSE INSIDE AIR TEMP CTRL FT BLOWER MT SW SIG LEFT I/P FUSE BLOCK (LOWER LEFT SIDE OF DASH) LOGIC LOW REF LOWER AUXILIARY AIR TEMPERATURE SENSOR (BEHIND RIGHT "C" PILLAR, FRONT OF HVAC) LT BLU WIRE ORG/ WIRE PANEL LP DIM CTRL FT AIR TEMP SW SIG POWER DISTRIBUTION SYSTEM PPL PPL/WHT WIRE RADIO FUSE REAR SEAT AUDIO (RSA) CONTROLLER RR HVAC FUSE RUN WIRE SPEED CTRL B(+) GROUND TAN WIRE TEMP CONTROL UNDERHOOD FUSE BLOCK (LEFT SIDE OF ENGINE COMPT, NEAR BATTERY) WHT WIRE WHT/BLK WIRE YEL WIRE YEL/BLK WIRE

A/C COMP CL RLY CTRL A/C COMPRESSOR CLUTCH A/C COMPRESSOR CLUTCH RELAY A/C LOW PRESSURE SWITCH (RIGHT SIDE OF ACCUMULATOR) A/C ON SWITCH A/C REF PRE SENS SIG A/C REFRIGERANT PRESSURE SENSOR (IN HIGH SIDE PRESSURE LINE) BLK WIRE CLASS 2 SER DATA LO PRESS SENS SIG CLASS 2 SERIAL DATA DK BLU WIRE DK GRN WIRE GRY WIRE HOT AT ALL TIMES A/C COMP FUSE HOT IN RUN OR START IGN E FUSE HVAC CONTROL MODULE (BEHIND CENTER OF DASH) LOGIC LOW REF POWERTRAIN CONTROL MODULE OR ENGINE CONTROL MODULE (LEFT FRONT OF ENGINE COMPT) RED WIRE UNDERHOOD FUSE BLOCK (LEFT SIDE OF ENGINE COMPT, NEAR BATTERY) WHT WIRE

A/C COMP CL RLY CTRL A/C COMPRESSOR CLUTCH A/C COMPRESSOR CLUTCH RELAY A/C LOW PRESSURE SWITCH (RIGHT SIDE OF ACCUMULATOR) A/C ON SWITCH A/C RECIRC A/C REF PRE SENS SIG A/C REFRIGERANT PRESSURE SENSOR (IN HIGH SIDE PRESSURE LINE) BLK WIRE BLK/WHT WIRE BLOWER FUSE BLOWER MOTOR (UNDER RIGHT SIDE OF DASH) BLOWER MOTOR CONTROL SWITCH BLOWER MOTOR RELAY BLOWER MOTOR RESISTOR ASSEMBLY (ON HVAC MODULE, NEAR BLOWER MOTOR) BRN WIRE BRN/WHT WIRE CLASS 2 SER DATA CLASS 2 SERIAL DATA DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE FRT DEF GRY WIRE HOT AT ALL TIMES HOT AT ALL TIMES A/C COMP FUSE HOT IN HOT IN RUN OR START IGN E FUSE HTR A/C FUSE HVAC 1 FUSE HVAC CONTROL MODULE (BEHIND CENTER OF DASH) HVAC/ ECAS FUSE I/P RELAY BLOCK (LEFT SIDE OF DASH) INST LAMP DIM CTRL GROUND LEFT I/P FUSE BLOCK (LOWER LEFT SIDE OF DASH) LEFT TEMP CONTROL LOGIC LOW REF LT BLU WIRE LT BLU/BLK WIRE LT GRN WIRE MODE CONTROL MODE DOOR CTRL MODE DOOR CTRL IGN 3 LOW REF B(+) OFF OFF BLOW MT CTRL LO PRESS SENS SIG RT TEMP DOOR CTRL LT TEMP DOOR CTRL ORG/ WIRE POWERTRAIN CONTROL MODULE OR ENGINE CONTROL MODULE (LEFT FRONT OF ENGINE COMPT) PPL RECIR DOOR CTRL RT TEMP DOOR CTRL LT TEMP DOOR CTRL RECIRC SWITCH RED WIRE RED/BLK WIRE RIGHT I/P FUSE BLOCK (LOWER RIGHT SIDE OF DASH) RIGHT TEMP CONTROL RUN WIRE TAN WIRE UNDERHOOD FUSE BLOCK (LEFT SIDE OF ENGINE COMPT, NEAR BATTERY) WHT WIRE WHT/BLK WIRE YEL WIRE

BLK WIRE BODY CONTROL MODULE (LOWER LEFT SIDE OF DASH, BELOW STEERING COLUMN) BRN WIRE CLASS 2 SERIAL DATA DK BLU WIRE DK GRN WIRE LEFT AIR TEMPERATURE ACTUATOR (BOTTOM OF HVAC MODULE) LOGIC LT BLU WIRE LT BLU/BLK WIRE LT GRN WIRE MODE ACTUATOR (LEFT SIDE OF HVAC MODULE) RECIRCULATION ACTUATOR (UPPER RIGHT OF HVAC MODULE) LOGIC RIGHT AIR TEMPERATURE ACTUATOR (TOP OF HVAC MODULE) RIGHT I/P FUSE BLOCK (LOWER RIGHT SIDE OF DASH) TAN WIRE WHT/BLK WIRE YEL WIRE

AUXILIARY AIR TEMPERATURE ACTUATOR (ON AUXILIARY HVAC MODULE ASSEMBLY) AUXILIARY BLOWER MOTOR (BEHIND RIGHT REAR QUARTERPANEL) AUXILIARY HEATER BLOWER MOTOR RESISTOR AUXILIARY HIGH SPEED BLOWER MOTOR RELAY AUXILIARY HVAC CONTROL PROCESSOR (CENTER OF HEADLINER) AUXILIARY LOW SPEED BLOWER MOTOR RELAY AUXILIARY MED SPEED BLOWER MOTOR RELAY AUXILIARY MODE ACTUATOR (ON AUXILIARY HVAC MODULE ASSEMBLY) BLK WIRE BLK/WHT WIRE BRN WIRE BRN/WHT WIRE DK BLU WIRE FAN COM FRONT AUXILIARY HVAC CONTROL ASSEMBLY FT MODE SIG FT TEMP SIG GROUND IGN 3 VOLTAGE GRY WIRE HIGH REAR MODE SIG REAR TEMP SIG HOT AT ALL TIMES HOT IN RUN LEFT I/P FUSE BLOCK (LEFT SIDE OF DASH) IGN 3 FUSE IGN 3 VOLT LOGIC LOW MED HIGH LT BLU WIRE MED OFF OFF REAR CTRL ORG/ WIRE REAR AUXILIARY HVAC CONTROL ASSEMBLY LOW REAR CTRL REAR ENABLE CTRL RED WIRE RED/BLK WIRE RR HVAC FUSE UNDERHOOD FUSE BLOCK (LEFT SIDE OF ENGINE COMPT, NEAR BATTERY) WHT WIRE WHT/ DK BLU WIRE WHT/BLK WIRE

AVALANCHE/ ESCALADE EXT BLK WIRE BODY CONTROL MODULE (LOWER LEFT SIDE OF DASH) COMPUTER DATA LINES SYSTEM HOT AT ALL TIMES HOT IN RUN, START HTR HVAC CONTROL MODULE (BEHIND CENTER OF DASH) I/P RELAY BLOCK (LOWER LEFT SIDE OF DASH) IGN LEFT CARGO DOOR CONTACT PLATE (BODY) LEFT CARGO DOOR CONTACT PLATE (DOOR) LEFT CARGO REAR WINDOW DEFOGGER GRID LIFTGATE DEFOGGER GRID LOGIC LT GRN WIRE PPL REAR DEFOG SWITCH REAR DEFOGGER RELAY REAR WINDOW DEFOGGER GRID RELAY CNTRL RIGHT CARGO DOOR CONTACT PLATE (BODY) RIGHT CARGO DOOR CONTACT PLATE (DOOR) RIGHT CARGO REAR WINDOW DEFOGGER GRID SERIAL DATA SPLICE PACK W/CARGO DOORS W/LIFTGATE WHT WIRE WINDOW CONTACTOR