Understanding the fuse box layout in your 2001 Chevrolet Express is crucial for diagnosing and resolving electrical issues. Fuses protect your vehicle’s electrical circuits from overloads, and knowing their locations can save you time and effort in troubleshooting. This guide will help you locate the fuse boxes and identify the specific fuse related to your OBD2 port, often referred to as the Data Link Connector (DLC).
The 2001 Chevy Express has two main fuse box locations:
- Instrument Panel Fuse Block: Located inside the vehicle, typically beneath the driver’s side dashboard.
- Engine Compartment Fuse Relay Center: Situated under the hood, usually near the engine or battery.
Let’s explore both fuse box locations with diagrams and descriptions to help you pinpoint the “2001 Chevy Express Obd2 Fuse” and other essential fuses.
Instrument Panel Fuse Block Diagram
The instrument panel fuse block is your first stop for many interior electrical components. This fuse box is usually more accessible and houses fuses for systems like lights, radio, and potentially the OBD2 port.
Instrument Panel Fuse Block Fuses:
| Fuse Type | Fuse No. | Description |
|---|---|---|
| MINI | 1 | (STOP) CHMSL, Stoplamps |
| MINI | 2 | (HTD MIR) Electric Heated Mirrors |
| MINI | 3 | (CTSY) Courtesy Lamps, Dome/RDG Lamps, Vanity Mirrors, Power Mirrors |
| MINI | 4 | (GAUGES) IP Cluster, DRL Relay, DRL Module, HDLP Switch, Keyless Entry Illumination, Low Coolant Module, CHIME Module, DRAB Module |
| MINI | 5 | (HAZARD) Hazard Lamps/CHIME Module |
| MINI | 6 | (CRUISE) Cruise Control |
| MINI | 7 | (PWR AUX) Auxiliary Power Outlet, DLC |
| MINI | 8 | (CRANK) Not Used |
| MINI | 9 | (PARK LPS) License Plate Lamp, Parking Lamps, Taillamps, Front Sidemarkers, Glove Box Ashtray |
| MINI | 10 | (AIR BAGS) Air Bags |
| MINI | 11 | (WIPER) Wiper Motor, Washer Pump |
| MINI | 12 | (HTR-A/C) A/C, A/C Blower, High Blower Relay, HTD Mirror |
| MINI | 13 | (CIG LTR) Cigarette Lighter |
| MINI | 14 | (ILLUM) IP Cluster, HVAC Controls, RR HVAC Controls, IP Switches, Radio Illumination, Door Switch Illumination |
| MINI | 15 | (DRL) DRL Relay |
| MINI | 16 | (TURN B/U) Front Turn, RR Turn, Back-up Lamps, BTSI Solenoid |
| MINI | 17 | (RADIO-1) Radio (Ign, Accy), Upfitter Provision Relay |
| MINI | 18 | (BRAKE) 4WAL PCM, ABS, Cruise Control |
| MINI | 19 | (RADIO-B) Radio (Battery), Power Antenna |
| MINI | 20 | (TRANS) PRNDL, Automatic Transmission |
| MINI | 21 | (SECURITY) Passlock |
| MINI | 22 | (RR DEFOG) Rear Window Defog |
| MINI | 24 | (RR HVAC) RR HVAC Controls, HIGH, MED, LOW Relays |
| ATO Circuit breaker | A | (PWR ACCY) Power Door Lock, Six-Way Power Seat, Keyless Entry Illumination Module |
| ATO Circuit breaker | B | (PWR WDO) Power Windows |
Identifying the OBD2 Fuse:
Look for Fuse No. 7, labeled (PWR AUX). This fuse is described as powering the “Auxiliary Power Outlet, DLC”. DLC stands for Data Link Connector, which is another name for the OBD2 port. Therefore, if you are experiencing issues with your OBD2 scanner not powering on or connecting to your 2001 Chevy Express, this is the first fuse to check. A blown fuse here will cut power to your OBD2 port, preventing communication with vehicle systems.
Engine Compartment Fuse Relay Center Diagram
The engine compartment fuse box houses fuses and relays for critical engine and vehicle operations. This box is typically under the hood and may contain fuses related to the Powertrain Control Module (PCM) or other engine management systems that could indirectly affect OBD2 functionality.
Engine Compartment Fuse Relay Center Fuses and Relays:
| Type | Name | Description |
|---|---|---|
| MAXI Fuse | BLOWER | Front Blower Motor |
| MAXI Fuse | ABS | Electronic Brake Control Module |
| MAXI Fuse | IGN-B | Ignition Switch |
| MAXI Fuse | IGN-A | Starter Relay, Ignition Switch |
| MAXI Fuse | BATT | Instrument Panel Fuse Block |
| MAXI Fuse | LIGHTING | Instrument Panel Fuse Block, Headlamp Switch |
| MINI Fuse | RR BLOWER | Rear Auxiliary Blower Motor Relays |
| MINI Fuse | ENG-I | Heated O2 Sensors, Mass Air Flow Sensor, Evap Canister Purge Valve, Crankshaft Position Sensor, Secondary Air Injection Relay [Diesel], Water in Fuel Sensor [Diesel], Fuel Heater [Diesel], Glowplug Relay [Diesel], Wastegate Solenoid [Diesel] |
| MINI Fuse | A/C | Air Conditioning Clutch Relay |
| MINI Fuse | SPARE | Spare Fuse |
| MAXI Fuse | AUX A | Upfitter Provisions |
| MAXI Fuse | AUX B | Upfitter Provisions |
| MINI Fuse | RH-HDLP | Right-hand Headlamp [Export only] |
| MINI Fuse | RH-HIBM | Right-hand High-beam Headlamp [Export only] |
| MINI Fuse | ECM-I | Ignition Coil, Camshaft Position Sensor, VCM, Fuel Injectors, Coil Driver |
| MINI Fuse | HORN | Horn Relay, Underhood Lamp(s) |
| MINI Fuse | LH-HDLP | Left-hand Headlamp [Export only] |
| MINI Fuse | LH-HIBM | Left-hand High-beam Headlamp [Export only] |
| MINI Fuse | FUEL SOL | Fuel Solenoid |
| MINI Fuse | IGN-E | Air Conditioning Clutch Relay |
| MINI Fuse | ECM-B | Fuel Pump Relay, VCM, PCM, Fuel Pump and Engine Oil Pressure Switch |
| Relay | HORN_R | Horn |
| Relay | A/C_R | Air Conditioning |
| Relay | FUEL PUMP_R | Fuel Pump |
| Relay | STARTER_R | Starter |
| Relay | A.I.R RELAY | Air |
| Relay | ABS EXPORT | ABS Export |
| Fuse puller | FSPLR | Extraction tool for fuse replacement. |
| MINI Fuse | SPARE1 | Spare Fuse |
| MINI Fuse | SPARE2 | Spare Fuse |
| MINI Fuse | SPARE3 | Spare Fuse |
| MAXI Fuse | U2 | Air Pump |
| MINI Fuse | U6 | Electronic Throttle Control |
While the engine compartment fuse box may not directly house a fuse labeled “OBD2”, it’s important to be aware of its location for other electrical diagnostics. Fuses like “ECM-B” or “IGN-A” relate to engine control and ignition, and issues here could potentially impact the overall vehicle’s diagnostic system.
Troubleshooting OBD2 Port Issues:
- Check Fuse #7 (PWR AUX) in the Instrument Panel Fuse Block: This is the most likely culprit for a non-functional OBD2 port. Replace it with a fuse of the same type and amperage if it’s blown.
- Inspect the OBD2 Port: Look for any physical damage or corrosion within the OBD2 port itself.
- Consult a Professional: If replacing the fuse doesn’t solve the problem, or if you suspect more complex electrical issues, it’s best to consult a qualified mechanic to diagnose the underlying cause.
By using these diagrams and fuse descriptions, you can confidently locate the “2001 chevy express obd2 fuse” and other fuses in your vehicle, making electrical troubleshooting more manageable. Remember to always consult your vehicle’s owner’s manual for the most accurate and up-to-date fuse information.
