BUZZERS, RELAYS & TIMERS
| Component | Location | |
|---|---|---|
| A/C Clutch Relay | On top of A/C plenum, behind right side of dash. | |
| Auxiliary Battery Relay | On left front inner fender panel, above wheelwell. | |
| Auxiliary Cooling Fan Relay | On left front inner fender panel, near firewall. | |
| Blower Relays (2) | On right side of firewall. | |
| Cold Advance Relay (6.2L Diesel) | On right side of firewall. (Схема №1) | |
| Compressed Natural Gas (CNG) Relay (5.7L CNG) | On right side of firewall. (Схема №2) | |
| Daytime Running Light (DRL) Relay | Behind left side of dash, below DRL module. | |
| Foglight Relay | Behind left side of dash, above convenience center. | |
| Fuel Pump Relay | ||
| 4.3L | On right side of firewall, near battery junction block cover. (Схема №3) | |
| 5.0L & 5.7L | On right side of firewall, near battery junction block cover. (Схема №4) | |
| 7.4L | On right side of firewall, near battery junction block cover. (Схема №5) | |
| Fuel Supply Relay (5.7L CNG) | On right side of firewall. (Схема №2) | |
| Hazard Flasher Relay | Under left side of dash, near convenience center. | |
| Horn Relay | On convenience center. | |
| Power Door Lock/Window Amplifier Relay | Under left side of dash, on left of brake pedal bracket. | |
| Rear Window Release Relay | On center of firewall. | |
| Speed Alert Alarm | Behind center of dash. | |
| Transfer Case Relay | On right side of firewall, near battery junction block cover. | |
| Turn Signal Flasher Relay | On convenience center. | |
BUZZERS, RELAYS & TIMERS LOCATION
CIRCUIT PROTECTION DEVICES
| Component | Location | |
|---|---|---|
| Circuit Breakers | On fuse block. | |
| Battery Junction Block | On right side of firewall. | |
| Convenience Center | Under left side of dash. | |
| Fuel Pump In-Line Fuse (5.0L & 5.7L) | On right side of firewall, near fuel pump relay. (Схема №4) | |
| Fuse Supply Fuse (5.7L CNG) | On right side of firewall. (Схема №2) | |
| Fuse Block | ||
| 4.3L | Under left side of dash. (Схема №3) | |
| 5.0L & 5.7L | Under left side of dash. (Схема №4) | |
| 7.4L | Under left side of dash. (Схема №5) | |
| 5.7L (CNG) | Under left side of dash. (Схема №2) | |
| Fusible Links | At battery junction block. | |
| Power Mirrors In-Line Fuse | Taped to harness, above fuse panel. | |
CIRCUIT PROTECTION DEVICES LOCATION
CONTROL UNITS
| Component | Location | |
|---|---|---|
| ABS Module | Mounted on side of brake master cylinder. | |
| A/C Control/Front & Rear Heater Control Logic Module (Dual System) | Above overhead console. | |
| A/C & Heater Control Logic Module (Single System) | In dash, behind instrument panel. | |
| Audio Alarm Module | On convenience center. | |
| Check Engine Light Driver Module (6.2L) | Under right side of dash, above blower motor. | |
| Cruise Control Module | On left side of firewall, near brake booster. | |
| Daytime Running Lights (DRL) Module | Behind left side of dash. | |
| Diesel Elec. Control (DEC) Module (6.2L Diesel) | Behind right side of dash. (Схема №1) | |
| Electronic Control Module (ECM) | ||
| 4.3L | Behind right side of dash, above blower motor. (Схема №3) | |
| 5.0L & 5.7L | Behind right side of dash, above blower motor. (Схема №4) | |
| 7.4L | Behind right side of dash, above blower motor. (Схема №5) | |
| 5.7L (CNG) | Behind right side of dash, above blower motor. (Схема №2) | |
| Elec. Spark Control (ESC) Module | ||
| 4.3L | On right side of engine, on valve cover. (Схема №3) | |
| 5.0L & 5.7L | On right side of engine, on valve cover. (Схема №4) | |
| 7.4L | On right side of engine, on valve cover. (Схема №5) | |
| Fuel Module | ||
| 5.0L, 5.7L & 5.7L HD | Behind right side of dash. (Схема №4) | |
| 7.4L | Behind left side of dash, behind brake booster. (Схема №5) | |
| Glow Plug Controller (6.2L) | On left rear of intake manifold. | |
| Hot Fuel Handling Module (5.7L & 7.4L) | Behind right side of dash, above blower motor. | |
| Low Coolant Module (6.2L) | On center of firewall. | |
| Powertrain Control Module (PCM) | Behind right side of dash, above blower motor. | |
| Transmission Control Module (TCM) | Behind right side of dash. | |
| Windshield Wiper Motor Module | On firewall, behind wiper motor. | |
CONTROL UNITS LOCATION
SENDING UNITS & SENSORS
| Component | Location | ||
|---|---|---|---|
| Coolant Temp. Sending Unit/Switch | In left cylinder head. | ||
| Coolant Temperature Sensor | |||
| Diesel | On right front of intake manifold. | ||
| Gasoline | |||
| 4.3L | On front of engine, near coolant outlet. (Схема №3) | ||
| 5.0L & 5.7L | On front of engine, near coolant outlet. (Схема №4) | ||
| 7.4L | On front of engine, near coolant outlet. (Схема №5) | ||
| 5.7L (CNG) | On front of engine, near coolant outlet. (Схема №2) | ||
| Engine Speed Sensor (6.2L Diesel) | On top rear of engine. (Схема №1) | ||
| Knock Sensor | |||
| 4.3L | On lower left side of engine, under exhaust manifold. (Схема №3) | ||
| 5.0L & 5.7L | On lower right front of engine, under exhaust manifold. (Схема №4) | ||
| 5.7L (CNG) | On lower right front of engine, under exhaust manifold. (Схема №2) | ||
| 7.4L | On lower right of engine, near starter. (Схема №5) | ||
| Low Coolant Sensor | On right rear side of radiator. | ||
| Manifold Abs. Press. (MAP) Sensor | |||
| 4.3L | On right side of engine, on valve cover. (Схема №3) | ||
| 5.0L & 5.7L | On right side of firewall. (Схема №4) | ||
| 5.7L (CNG) | On top right rear of engine. (Схема №2) | ||
| 6.2L Diesel | On left side of firewall, near wiper motor. (Схема №1) | ||
| 7.4L | On right rear of engine, on valve cover. (Схема №5) | ||
| M/T Input/Output Speed Sensor | On left side of transmission. | ||
| Throttle Position Sensor (TPS) | |||
| 6.2L Diesel | On injection pump throttle valve. (Схема №1) | ||
| 4.3L | On throttle body assembly. (Схема №3) | ||
| 5.0L & 5.7L | On throttle body assembly. (Схема №4) | ||
| 7.4L | On throttle body assembly. (Схема №5) | ||
| 5.7L (CNG) | On throttle body assembly. (Схема №2) | ||
| Transfer Case Speed Sensor | On left rear of transfer case. | ||
| Vehicle Speed Sensor (VSS) | |||
| 4.3L | On right side of extension housing (2WD) or transfer case (4WD). (Схема №3) | ||
| 5.0L & 5.7L | On right side of extension housing (2WD) or transfer case (4WD). (Схема №4) | ||
| 7.4L | On right side of extension housing (2WD) or transfer case (4WD). (Схема №5) | ||
| Vehicle Speed Sensor (VSS) (5.7L CNG) | On right side of extension housing (2WD) or transfer case (4WD). (Схема №2) | ||
| Vehicle Speed Sensor Buffer | Behind glove box. | ||
| Water-In-Fuel Sensor (6.2L) | In fuel filter assembly. | ||
SENDING UNITS & SENSORS LOCATION
MOTORS
| Component | Location | |
|---|---|---|
| A/C Inlet Door Motor | On A/C plenum, behind right side of dash. | |
| Blower Motor | Under right side of dash. | |
| Idle Air Control (IAC) Motor | ||
| 4.3L | On throttle body assembly. (Схема №3) | |
| 5.0L & 5.7L | On throttle body assembly. (Схема №4) | |
| 7.4L | On throttle body assembly. (Схема №5) | |
| 5.7L (CNG) | On throttle body assembly. (Схема №2) | |
| Windshield Washer Pumps | In washer fluid reservoir. | |
| Windshield Wiper Motor | On left center of firewall. | |
MOTORS LOCATION
SOLENOIDS & SOLENOID VALVES
| Component | Location | |
|---|---|---|
| AIR Diverter Solenoid | On lower right front of engine. | |
| Cold Advance Solenoid (6.2L) | On injection pump, on left front of engine. | |
| EGR Vacuum Solenoid | ||
| 4.3L | On top right of intake manifold. (Схема №3) | |
| 5.0L & 5.7L | On right side of engine, on valve cover. (Схема №4) | |
| 5.7L (CNG) | On right side of engine, on valve cover. (Схема №2) | |
| 6.2L Diesel | On top left rear of engine, near valve cover. (Схема №1) | |
| 7.4L | On top of engine, near right valve cover. | |
| EGR Vent Solenoid (6.2L Diesel) | On top left rear of engine. (Схема №1) | |
| Electric Air Control (EAC) Solenoid | ||
| 4.3L | On right front of engine, on valve cover. (Схема №3) | |
| 7.4L | On right front of engine, on valve cover. (Схема №5) | |
| Elec. Vacuum Regulator Valve (EVRV) | ||
| 5.7L | On top right rear of engine, on valve cover. | |
| 7.4L | On top front of engine. (Схема №5) | |
| Exhaust Pressure Regulator (EPR) Solenoid (6.2L Diesel) | On top left rear of engine. (Схема №1) | |
| Fast Idle Solenoid (6.2L Diesel) | On injection pump, on left front of engine. (Схема №1) | |
| Front Axle Solenoid | On right side of front differential case. | |
| Fuel Cylinder Solenoids (5.7L CNG) | On each natural gas tank. | |
| Fuel Shutoff Solenoid (6.2L) | On injection pump, on left front of engine. | |
| Low Pressure Fuel Shut-Off Solenoid (5.7L CNG) | Under left side of cab, near crossmember. | |
| Torque Conv. Clutch (TCC) Solenoid | ||
| 4.3L | On left rear of transmission. (Схема №3) | |
| 5.0L & 5.7L | On left rear of transmission. (Схема №4) | |
| 6.2L Diesel | On left rear of transmission. (Схема №1) | |
SOLENOIDS & SOLENOID VALVES LOCATION
SWITCHES
| Component | Location | |
|---|---|---|
| A/C Pressure Cycling Switch | On A/C accumulator. | |
| Auxiliary Cooling Fan Switch | On right side of engine, above spark plug. | |
| Back-Up Light Switch (M/T) | On left side of transmission. | |
| Brake Pressure Warning Switch | In hydraulic brake combination valve, on master cylinder. | |
| Brake/Cruise/Stoplight Switch | On brake pedal bracket. | |
| Clutch/Neutral Safety Switch | On clutch pedal bracket. | |
| Coolant Temperature Switch | On left front side of engine, near exhaust manifold. | |
| Fast Idle Temp. Switch (6.2L) | On right rear of engine, above starter. | |
| Front Axle Solenoid Switch | Near differential case, at front of engine. | |
| Fuel Door Cut-Off Switch (5.7L CNG) | On fuel filler door. | |
| Fuel Pump/Oil Pressure Switch | ||
| 4.3L | On left side of engine block, under exhaust manifold. (Схема №3) | |
| 5.0L & 5.7L | On left side of engine block, under exhaust manifold. (Схема №4) | |
| Oil Pressure Sender/Switch | ||
| 4.3L | On top rear of engine, near distributor. (Схема №3) | |
| 5.0L & 5.7L | On left rear of engine, near distributor. (Схема №4) | |
| 5.7L (CNG) | On left rear of engine, near distributor. (Схема №2) | |
| 6.2L | On top rear of engine. | |
| 7.4L | On lower left front of engine. (Схема №5) | |
| Parking Brake Switch | On parking brake pedal bracket. | |
| Park/Neutral/Backup Light Switch | On steering column, under dash. | |
| Seat Belt Switch | On driver's seat belt buckle. | |
| Transfer Case Switch | On left front of transfer case. | |
SWITCHES LOCATION
MISCELLANEOUS
| Component | Location | |
|---|---|---|
| ABS Diode | Under left side of dash. | |
| ALDL Diagnostic Connector | ||
| 4.3L | Under left side of dash, left of column. (Схема №3) | |
| 5.0L & 5.7L | Under left side of dash, left of column. (Схема №4) | |
| 7.4L | Under left side of dash, left of column. (Схема №5) | |
| 6.2L Diesel | Under left side of dash, left of column. (Схема №1) | |
| 5.7L (CNG) | Under left side of dash, left of column. (Схема №2) | |
| Blower Resistor | On evaporator case. | |
| Fuel Heater (6.2L) | On fuel filter assembly. | |
| Fuel Pump Prime/Test Connector | ||
| 4.3L | On right side of firewall, near battery junction block. (Схема №3) | |
| 5.0L & 5.7L | On right side of firewall, near battery junction block. (Схема №4) | |
| 7.4L | On right side of firewall, near battery junction block. (Схема №5) | |
| Fuel Supply Test Connector (5.7L CNG) | Under left side of dash. (Схема №2) | |
| Power Door Lock/Window Amplifier | Under driver's seat. | |
| Vehicle Speed Sensor Buffer | Behind glove box. | |
MISCELLANEOUS LOCATION