Understanding the fuse box in your 2002 Dodge Ram 1500 is crucial for diagnosing and resolving electrical problems, including issues related to your OBD2 port. Fuses protect your vehicle’s electrical circuits from overloads, and knowing their locations and functions can save you time and money on repairs. This guide will help you locate the fuse responsible for your OBD2 port and provide a comprehensive overview of the 2002 Ram 1500 fuse box diagram.
Your 2002 Ram 1500’s fuse box is typically located under the hood, near the battery. It houses a variety of fuses and relays that control different electrical systems throughout your truck. To find the specific fuse for your OBD2 port, you’ll need to consult the fuse box diagram, usually printed on the inside of the fuse box cover. While “OBD2 fuse” might not be explicitly labeled, you should look for fuses related to the “Data Link Connector” or “Diagnostic Connector,” as these terms refer to the OBD2 port.
According to the 2002 Dodge Ram 1500 fuse box diagram, several fuses are relevant to the diagnostic system and related components. Fuse number 18 (15A MINI) and fuse number 51 (20A ATO) are both described as being connected to the “Data Link Connector” and “Radio, Cluster, Underhood Lamp”. It’s crucial to check both of these fuses if you are experiencing issues with your OBD2 port, radio, instrument cluster, or underhood lamp. A blown fuse in either of these locations could potentially disable your OBD2 port, preventing you from reading diagnostic trouble codes or using scan tools.
Here is a detailed breakdown of the 2002 Dodge Ram 1500 fuse box diagram to further assist you in identifying other fuses and relays:
| Fuse/Relay Number | Type | Amperage | Description |
|---|---|---|---|
| 1 | Fuse FMX/JCase | 40A | Trailer Tow Connector, Electric Brake Provision |
| 2 | Fuse FMX/JCase | 30A | Auto Shut Down Relay (Gasoline) |
| 3 | Fuse FMX/JCase | 30A | Ignition Switch (Run A38 (Integrated Power Module)) |
| 4 | Fuse FMX/JCase | 40A | Ignition Switch (Run C1 (Blower Motor)) |
| 5 | Fuse FMX/JCase | 40A | Transmission Control Relay |
| 6 | Fuse FMX/JCase | 40A | Controller Antilock Brake (ABS (AWAL/RWAL)) |
| 7 | Fuse FMX/JCase | 50A | Power Seat Switch Driver, Power Seat Switch Passenger, Passenger Lumbar Switch (Standard Cab) |
| 8 | Fuse FMX/JCase | 30A | Wiper High/Low Relay, Wiper On/Off Relay |
| 9 | Fuse FMX/JCase | 40A | Ignition Switch (Run ACC F1 (Circuit Breaker (25A): Power Window)) |
| 10 | Fuse FMX/JCase | 40A | Ignition Switch (Run ACC A31) |
| 11 | Fuse FMX/JCase | 30A | Front Control Module |
| 13 | Fuse FMX/JCase | 30A | Front Control Module |
| 14 | Fuse FMX/JCase | 30A | Starter Motor Relay |
| 15 | Fuse FMX/JCase | 50A | Park Lamp Relay |
| 16 | Fuse MINI | 10A | Air Conditioner Compressor Clutch Relay |
| 17 | Fuse MINI | 15A | Glove Box Lamp and Switch, Driver Door Module (except Base), Compass/Mini Trip Computer (except Base), Dome Lamp, Overhead Map/Reading Lamp (except Base), Center High Mounted Stop Lamp, Cargo Lamp, Fuel Pump Relay |
| 18 | Fuse MINI | 15A | Cluster, Underhood Lamp, Data Link Connector, Radio |
| 19 | Fuse MINI | 10A | Sentry Key Immobilizer Module, Powertrain Control Module |
| 20 | Fuse MINI | 25A | Ignition Switch (Run-Start A21, Start A41, Off-Run-Start A51 (Cluster, Powertrain Control Module, Integrated Power Module, Push Button Starter Switch)) |
| 21 | Fuse MINI | 20A | Audio Amplifier |
| 22 | Fuse MINI | 20A | Cluster |
| 24 | Fuse MINI | 15A | Stop Lamp Switch |
| 25 | Fuse MINI | 20A | Power Outlet Console |
| 26 | Fuse MINI | 25A | Transfer Case Selector Switch |
| 27 | Fuse MINI | 15A | Heated Mirror Relay |
| 28 | Fuse MINI | 10A | Cluster, Compass/Mini Trip Computer (except Base), Automatic Day/Night Mirror (except Base), Door Lock Switch Passenger (except Base) |
| 29 | Fuse MINI | 20A | Cigar Lighter, Rear Power Outlet (SRT) |
| 32 | Fuse MINI | 10A | Park/Turn Signal Lamp – Right Front, Tail/Stop Turn Signal Lamp – Right, License Lamp – Right, Center Bazel Lamp, Clearance Lamp, Fender Lamp |
| 33 | Fuse MINI | 20A | Trailer Tow Connector, Trailer Tow Connector Add On (Heavy Duty) |
| 34 | Fuse MINI | 10A | Park/Turn Signal Lamp – Left Front, Tail/Stop Turn Signal Lamp – Left, License Lamp – Left (+Right), Tailgate Bar Lamp, Fender Lamp |
| 35 | Fuse MINI | 10A | Controller Antilock Brake (ABS) |
| 36 | Fuse MINI | 10A | Heating and Air Conditioning Control |
| 38 | Fuse MINI | 15A | Transfer Range Sensor (Automatic Transmission), Transmission Solenoid/TRS Assembly, Backup Lamp Switch (Manual Transmission) |
| 40 | Fuse MINI | 15A | Adjustable Pedal Relay |
| 41 | Fuse MINI | 15A | Fog Lamp Relay |
| 42 | Fuse MINI | 20A | Power Outlet Console |
| 43 | Fuse MINI | 25A | Transfer Case Control Module, Subwoofer Amplifier (SRT), Final Drive Control Module (Off Road) |
| 45 | Fuse MINI | 20A | Horn Relay |
| 46 | Fuse MINI | 15A | Trailer Tow Left Turn Relay |
| 47 | Fuse MINI | 15A | Trailer Tow Right Turn Relay |
| 48 | Fuse MINI | 20A | Seat Heater Module, Window/Door Lock Switch – Driver (’05) |
| 49 | Fuse MINI | 20A | Oxygen Sensor Downstream Relay, Oxygen Sensor – Front Left/Right |
| 50 | Fuse MINI | 10A | EVAP Purge Solenoid |
| 51 | Fuse ATO | 20A | Underhood Lamp, Data Link Connector, Radio, Cluster |
| 52 | Fuse ATO | 20A | Airbag Control Module |
| 53 | Fuse ATO | 20A | Airbag Control Module, Passenger Airbag On/Off Switch |
| 54 | Relay | – | Heated Mirror |
| 55 | Relay | – | Wiper On/Off |
| 56 | Relay | – | Condenser Fan |
| 57 | Relay | – | Auto Shut Down (Gasoline) |
| 58 | Relay | – | Fuel Pump (Gasoline) |
| 59 | Relay | – | Transmission Control |
| 60 | Relay | – | Wiper High/Low |
| 61 | Relay | – | Spare |
| 62 | Relay | – | Fog Lamp |
| 63 | Relay | – | Adjustable Pedal |
| 64 | Relay | – | Air Conditioner Compressor Clutch |
| 65 | Relay | – | Spare |
| 66 | Relay | – | Oxygen Sensor Downstream |
| 67 | Relay | – | Spare |
| 69 | Relay | – | Spare |
| 70 | Relay | – | Spare |
| 71 | Relay | – | Spare |
| 72 | Relay | – | Starter Motor |
| 73 | Relay | – | Park Lamp |
By carefully checking fuses 18 and 51 in your 2002 Ram 1500’s fuse box, you can quickly diagnose and potentially fix issues related to your OBD2 port and other electrical components. Always replace a blown fuse with one of the same amperage to prevent further electrical damage. If you continue to experience problems after replacing the fuse, it’s recommended to consult a qualified mechanic for further diagnosis and repair.
