Dodge Ram Wagon B2500 (1996-2002) rear a/c- heater unit Wiring diagrams

1 2 3 PRESS SW OUTPUT IGNITION A/C SWITCH SENSE A/C COMP RLY CTRL A/C PRESSURE SIG A/C SWITCH SENSE A/C COMPRESSOR A/C COMPRESSOR CLUTCH A/C COMPRESSOR CLUTCH RELAY (IN POWER DISTRIBUTION CENTER) A/C CYCLING SWITCH (IN FRONT EVAPORATOR COIL FINS) A/C HEATER CONTROL A/C HIGH PRESSURE SWITCH (ON DISCHARGE LINE, NEAR A/C CONDENSER) A/C LOW PRESSURE SWITCH (ON SUCTION LINE, NEAR FILTER DRIER) A/C SELECT DEFROST A/C SWITCH SIGNAL AMPLIFIER BLEND AIR DOOR ACTUATOR (UNDER DASH, AT TOP RIGHT END OF DISTRIBUTION DUCT) BLK WIRE BLK/BRN WIRE BLK/VIO WIRE BLOWER MOTOR (IN ENGINE COMPART- MENT IN BLOWER HOUSING) DK BLU WIRE DK BLU/BLK WIRE DK BLU/ORG WIRE DK BLU/RED WIRE DK BLU/WHT WIRE DK GRN WIRE DK GRN/WHT WIRE FAN HIGH FUSE 5 GRN WIRE HIGH BLOWER RELAY (IN ENGINE COMPARTMENT, ON HEATER-A/C HOUSING TOP COVER) HOT AT ALL TIMES HOT AT ALL TIMES POWER DISTRIBUTION CENTER FUSE 4 HOT IN RUN JUNCTION BLOCK FUSE 2 HVAC IGNITION RUN RELAY (IN POWER DISTRIBUTION CENTER) JOINT CONNECTOR NO.1 (LEFT SIDE OF DASH) LOW MED 1 MED 2 LT BLU WIRE LT GRN/GRY WIRE LT GRN/WHT WIRE NEAR BOTTOM OF BRAKE BOOSTER) OFF REC PANEL BI-LEVEL OFF REC PANEL BI-LEVEL FLOOR MODE DE-FOG DEFROST ORG/ WIRE POWERTRAIN CONTROL MODULE (CENTER OF FIREWALL) REAR A/C REAR A/C- HEATER UNIT RED WIRE RED/VIO WIRE RED/YEL WIRE TAN WIRE VIO WIRE VIO/WHT WIRE WHT WIRE YEL WIRE

1 2 3 A/C SWITCH SENSE IGNITION A/C SWITCH SENSE A/C COMP RLY CTRL A/C PRESSURE SIG A/C SWITCH SENSE A/C COMPRESSOR CLUTCH A/C COMPRESSOR CLUTCH RELAY A/C CYCLING SWITCH (IN FRONT EVAPORATOR COIL FINS) A/C HEATER CONTROL A/C HIGH PRESSURE SWITCH (ON DISCHARGE LINE, NEAR A/C CONDENSER) A/C LOW PRESSURE SWITCH (ON SUCTION LINE, NEAR FILTER DRIER) A/C SELECT FLOOR MIX DEF A/C SWITCH SIGNAL AMPLIFIER BLEND DOOR ACTUATOR (UNDER DASH, AT TOP RIGHT END OF DISTRIBUTION DUCT) BLK WIRE BLK/ORG WIRE BLK/TAN WIRE BLK/VIO WIRE BLOWER MOTOR (IN ENGINE COMPART- MENT IN BLOWER HOUSING) BLOWER MOTOR RELAY BLOWER MOTOR SPEED SWITCH DK BLU WIRE DK BLU/BLK WIRE DK BLU/ORG WIRE DK BLU/RED WIRE DK BLU/WHT WIRE DK GRN WIRE DK GRN/WHT WIRE EXTENDED BODY FUSE 12 FUSE 13 GROUND HIGH BLOWER RELAY HOT AT ALL TIMES HOT IN RUN FUSE BLOCK (ON LEFT END OF DASH) FUSE 10 J/C 3 (LEFT SIDE OF DASH) LOW MED 1 MED 2 LT BLU WIRE LT GRN WIRE LT GRN/GRY WIRE LT GRN/WHT WIRE MAX OFF PANEL (A/C) BI-LEV PANEL (VENT) MODE ORG/ WIRE POWER DISTRIBUTION CENTER (IN ENGINE COMPARTMENT, NEXT TO BATTERY) POWERTRAIN CONTROL MODULE (PCM) (CENTER OF FIREWALL) REAR A/C REAR A/C- HEATER UNIT REAR WINDOW DEFOGGER SWITCH RED WIRE RED/DK GRN (OR NCA) WIRE RED/DK GRN WIRE RED/YEL WIRE RELAY & FUSE BLOCK (ON LEFT END OF DASH) STANDARD BODY TAN WIRE VIO WIRE VIO/WHT WIRE WHT WIRE YEL WIRE

1 2 3 A/C SWITCH SENSE IGNITION A/C SWITCH SENSE A/C COMPRESSOR CLUTCH A/C COMPRESSOR CLUTCH RELAY A/C CYCLING SWITCH (IN FRONT OF EVAPORATOR COIL FINS) A/C HEATER CONTROL A/C HIGH PRESSURE SWITCH (ON DISCHARGE LINE, NEAR A/C CONDENSER) A/C LOW PRESSURE SWITCH (ON SUCTION LINE, NEAR FILTER DRIER) A/C PRESSURE SIG A/C SWITCH SENSE A/C COMP RLY CTRL A/C SELECT A/C SWITCH SIGNAL AMPLIFIER BLEND DOOR ACTUATOR (UNDER DASH, AT TOP RIGHT END OF DISTRIBUTION DUCT) BLK WIRE BLK/TAN WIRE BLK/VIO WIRE BLOWER MOTOR (IN ENGINE COMPART- MENT IN BLOWER HOUSING) BLOWER MOTOR SPEED SWITCH DK BLU WIRE DK BLU/BLK WIRE DK BLU/ORG WIRE DK BLU/RED WIRE DK BLU/WHT WIRE DK GRN/WHT WIRE EXTENDED BODY FLOOR MIX DEF FUSE 12 FUSE 13 HIGH BLOWER RELAY HOT AT ALL TIMES HOT IN RUN FUSE BLOCK (ON LEFT END OF DASH) FUSE 10 IGNITION SWITCH J/C 3 (LEFT SIDE OF DASH) LOCK LOW MED 1 MED 2 LT BLU WIRE LT GRN/GRY WIRE LT GRN/WHT WIRE MAX OFF PANEL (A/C) BI-LEV MODE OFF ORG/ WIRE PANEL (VENT) POWER DISTRIBUTION CENTER (IN ENGINE COMPARTMENT, NEXT TO BATTERY) POWER DISTRIBUTION CENTER (IN ENGINE COMPT, NEXT TO BATTERY) POWERTRAIN CONTROL MODULE (PCM) (CENTER OF FIREWALL) REAR A/C REAR A/C- HEATER UNIT REAR WINDOW DEFOGGER SWITCH GROUND RED WIRE RED/DK GRN WIRE RED/YEL WIRE RUN WIRE STANDARD BODY TAN WIRE VIO WIRE VIO/WHT WIRE YEL WIRE

A/C HEATER CONTROL A/C SWITCH SIG BLK WIRE BLK/ORG (OR NCA) WIRE BLK/ORG WIRE DK GRN WIRE DK GRN/WHT (OR NCA) WIRE GRN WIRE GRY WIRE HIGH BLOWER RELAY HOT AT ALL TIMES HOT IN RUN JUNCTION BLOCK (BEHIND LEFT SIDE OF DASH) FUSE 7 IGNITION RUN RELAY J/C 1 (BEHIND LEFT SIDE OF DASH) LT BLU (OR NCA) WIRE MED LOW MODE DOOR MODULE NCA WIRE OFF/ HIGH ORG/ WIRE POWER DISTRIBUTION CENTER (IN ENGINE COMPARTMENT, NEXT TO BATTERY) FUSE 7 REAR A/C HEATER CONTROL REAR A/C- HEATER UNIT REAR BLOWER MOTOR RED WIRE RED/GRY WIRE RESISTOR BLOCK WHT OR NCA WIRE

AUTOMATIC SHUT DOWN RELAY BATTERY BLK WIRE BRN WIRE COIL CONTROLLER ANTI-LOCK BRAKE DAYTIME RUNNING LAMP MODULE DK BLU WIRE DK GRN WIRE ELECTRIC BRAKE PROVISION ENGINE CONTROLS SYSTEM ENGINE STARTER MOTOR RELAY ENGINE STARTER MOTOR TRAILER TOW STANDARD EXCEPT CALIFORNIA FROM FUSE 11 (DIAGRAM 1 OF 3) FUSE 11 FUSE 12 FUSE 14 FUSE 16 FUSE 13 FUSE 15 FUSE 17/18 FUSE 19/20 FUSE 21/22 FUSE 3 FUSE 4 FUSE 5 FUSE 6 FUSE 7 FUSE 8 FUSE 9/10 GENERATOR GRN WIRE GRY WIRE HEADLAMP RELAY HEADLAMP SWITCH HIGHLINE OTHER J/C 4 (LEFT SIDE OF DASH) OF BRAKE BOOSTER) (NEAR BREAKOUT FOR WINDSHIELD WASHER PUMP) ORG/ WIRE OXYGEN SENSOR 1/1 UPSTREAM OXYGEN SENSOR 1/1 UPSTREAM OXYGEN SENSOR 2/1 UPSTREAM OXYGEN SENSOR DOWNSTREAM RELAY OXYGEN SENSOR-1/2 DOWNSTREAM PNK WIRE POWER DISTRIBUTION CENTER (IN ENGINE COMPARTMENT, NEXT TO BATTERY) POWERTRAIN CONTROL MODULE REAR A/C- HEATER UNIT REAR WINDOW DEFOGGER SWITCH RED WIRE RED/YEL WIRE RELAY & FUSE BLOCK (ON LEFT END OF DASH) STOPLIGHT SWITCH TAN WIRE TO FUSE 6 (DIAGRAM 1 OF 3) TO FUSE BLOCK (FUSE 15) DIAGRAM 3 OF 3) TO FUSE BLOCK (FUSE 20) DIAGRAM 3 OF 3) TO IGNITION SWITCH (DIAGRAM 2 OF 3) TO IGNITION SWITCH (DIAGRAM 2 OF 3) TO IGNITION SWITCH (DIAGRAM 2 OF 3) TRAILER TOW CLASS III TRAILER TOW RELAY VAN CONVERSION ACCESSORY POWER RELAY VAN CONVERSION PROVISION VIO WIRE VIO/ORG WIRE WHT WIRE YEL WIRE

A/C COMPRESSOR CLUTCH RELAY A/C HEATER CONTROL A/C CYCLING SWITCH AIR BAG CONTROL MODULE AMPLIFIER BASE/ MIDLINE ONLY BLEND DOOR ACTUATOR DK BLK WIRE BLU WIRE CENTRAL TIMER MODULE CIRCUIT BREAKER 1 CONTROLLER ANTI-LOCK BRAKE COURTESY LAMP RELAY LEFT COMBINATION FLASHER DATA LINK CONNECTOR (DLC) DK BLU WIRE DK DK DK GRN WIRE DOME LAMPS SWITCH GLOVE BOX LAMP, SWITCH DRIVER DOOR POWER LOCK SWITCH FROM IGNITION SWITCH (DIAGRAM 2 OF 3) FROM POWER DISTRIBUTION CENTER (FUSE 6) (DIAGRAM 1 OF 3) FROM POWER DISTRIBUTION CENTER (FUSE 8) (DIAGRAM 1 OF 3) FUEL PUMP RELAY FUSE 1 FUSE 10 FUSE 11 FUSE 12 FUSE 13 FUSE 14 FUSE 15 FUSE 16 FUSE 18 FUSE 19 FUSE 20 FUSE 4 FUSE 9 FUSE BLOCK (ON LEFT END OF DASH) GRN WIRE HEADLAMP SWITCH HIGH BLOWER RELAY A/C COMPRESSOR CLUTCH RELAY INSTRUMENT CLUSTER J/C 3 (LEFT SIDE OF DASH) LT BLU WIRE MIDLINE MIDLINE I/ HIGHLINE ORG/ WIRE OTHER OTHER MIDLINE/ HIGHLINE PASSENGER DOOR POWER LOCK SWITCH PNK PNK WIRE PNK WIRE POWER DISTRIBUTION CENTER (IN ENGINE COMPARTMENT, NEXT OT BATTERY) POWER DISTRIBUTION CENTER (IN ENGINE COMPARTMENT, NEXT TO BATTERY) POWER DOOR LOCK MODULE POWER MIRROR SWITCH UNDER- HOOD LAMP POWER OUTLET RADIO REAR A/C- HEATER UNIT REAR WINDOW DEFOGGER SWITCH RED WIRE RED/YEL WIRE RELAY & FUSE BLOCK (ON LEFT END OF DASH) TRANS- MISSION RANGE SENSOR VIO WIRE WHT WIRE YEL WIRE

A/C HEATER CONTROL A/C SWITCH SIGNAL BLK WIRE BLK/LT BLU WIRE BLK/ORG WIRE BLOWER MOTOR BLOWER MOTOR SPEED SWITCH DK GRN WIRE DK GRN/WHT WIRE EXTENDED BODY FUSE 10 FUSE 7 FUSE BLOCK (ON LEFT END OF DASH) GRY WIRE HIGH BLOWER RELAY HOT AT ALL TIMES HOT IN RUN IGNITION RUN RELAY J/C 3 (LEFT SIDE OF DASH) MED MED LOW OFF HIGH MODE DOOR MODULE NCA WIRE ORG/ WIRE POWER DISTRIBUTION CENTER (IN ENGINE COMPARTMENT, NEXT TO BATTERY) REAR A/C HEATER CONTROL REAR A/C- HEATER UNIT RED WIRE RED/DK GRN WIRE RED/GRY WIRE RESISTOR BLOCK STANDARD BODY WATER VALVE ACTUATOR