Saturn ION (2003 – 2004) – fuse box diagram
Year of production: 2003, 2004
Instrument Panel Fuse Block
Some fuses are in a fuse block on the driver’s side of the floor console.
| Fuses | Usage |
| AIR BAG | Air bags, Sensing and Diagnostic Module (SDM) |
| ACCOMMODATION INTERFACE/ ONSTAR | Entertainment, Mobile Communications, OnStar |
| CRUISE | Cruise Control Module, Clutch Start Switch |
| EPS/CRUISE | Cruise Control Switches, EPS Unit |
| FUEL PUMP | Fuel Pump Relay |
| HVAC | Climate Control |
| CLUSTER | Instrument Panel Cluste |
| LIGHTER | Cigar Lighter |
| RADIO (BATT1) | Radio Receiver, Entertainment Memory |
| RADIO (ACC) | Radio Receiver, Entertainment |
| SUNROOF | Power Sunroof, OnStar Mirror |
| WIPER SW | Windshield Wipers and Washers, Transaxle Shift Lock Control Switch |
| DASH | Instrument Panel, Dimming Switch |
| IGN SW | Ignition Switch |
| PARK | Headlamp Switch |
| PWR OUTLET | Auxiliary Power Outlet |
| PWR WINDOWS | Power Window Switches |
| STOP | Stoplamp (Brake) Switch |
| BCM ELECT | Ignition Switch, Body Control Module (BCM) |
| BMC (PWR) | Entry Control, Trunk Release |
| Relay | Usage |
| RUN | Climate Control (HVAC Blower, Control Heads) |
| ACC | Power Windows, Sunroof, Radio, Wiper/Washer Switch, Accessory Power Outlet |
| FUEL PUMP | Fuel Pump |
| ALC/PARK | OnStar, Radio, Instrument Panel Cluster, Body Control Module (Entry Control), Cigar Lighter, Headlamp Switch, License Lamp |
Engine Compartment Fuse Block
The engine compartment fuse block is located in the engine compartment on the driver’s side of the vehicle.
2.2L L4 Engine
| Fuses | Usage | |
| 1 | ECM/TCM | Engine Control Module, Transmission Control Module |
| 4 | HDLP-RH | Passenger’s Side Headlamp |
| 5 | A/C | Air Conditioning Clutch Rela |
| 8 | ABS2 | Anti-lock Brake System, Traction Control Module |
| 9 | ECM | Engine Control Module |
| 10 | ERLS | Canister Purge Solenoid, Canister Vent Solenoid, Low Coolant Switch, Oxygen Sensors |
| 11 | IGN | Electric Ignition Control Module, Charging System, Neutral Stop Back-Up Switch |
| 13 | TRANS2 | Transaxle (VTi Variable) |
| 14 | TRANS1 | Transmission Control Module, Neutral Stop Back-Up |
| 15 | BACK-UP | PRNDL, Back-up Switch |
| 16 | INJECTORS | Fuel Injectors (Cylinder 1, 2, 3, 4) |
| 17 | FOG | Fog Lamp Micro Relay |
| 18 | HDLP-LH | Driver’s Side Headlamp |
| 19 | WIPER | Wiper Mini Relay |
| 20 | HORN | Horn Micro Relay |
| 21 | PREM AUDIO | Entertainment, Premium Radio Amplifier |
| 22 | ABS | Anti-lock Brake System, Traction Control Module |
| 23 | RR DEFOG | Rear Defog Mini Relay |
| 38 | RUN/CRANK | Ignition 1 Mini Relay |
| 39 | IP BATT1 | Body Control Module |
| 40 | ABS | Anti-Lock Brake System, Traction Control Module |
| 41 | IP BATT2 | Body Control Module |
| 42 | EPS2 | Electric Power Steering |
| 43 | EPS1 | Electric Power Steering |
| 45 | COOLING FAN | Cooling Fan Mini Relay |
| 46 | CRANK | Powertrain Control Module Mini Relay |
| 47 | IP BATT 1A | Body Control Module |
| 48 | RUN (IGN 3) | Body Control Module |
| Relays | Usage | |
| 24 | A/C | Air Conditioning Clutch |
| 25 | HORN | Horn |
| 26 | FOG LAMP | Fog Lamps |
| 28 | RUN/CRANK | Body Control Module |
| 30 | COOLING FAN | Engine Cooling Fan |
| 31 | PCM CONT | ECM |
| 32 | WIPER1 | Wiper System |
| 33 | WIPER2 | Wiper System |
| 34 | REAR DEFOG | Rear Window Defogger |
| Diodes | Usage | |
| 35 | A/C | Air Conditioning Diode |
| 37 | WIPER | Wiper Diode |
Engine Compartment Fuse Block (2.0L Supercharged Engine)
| Fuses | Usage | |
| 1 | ECM | Engine Control Module |
| 4 | RH HDLP | Passenger’s Side Headlamp |
| 5 | A/C | Air Conditioning Clutch Relay |
| 8 | ABS | Anti-lock Brake System |
| 9 | ECM/ETC | Engine Control Module |
| 10 | EMISS | Canister Purge Solenoid, Mass Air Flow Sensor, Low Coolant Switch, Oxygen Sensors |
| 11 | IGN | Ignition Coils (1,2,3,4) |
| 13 | ECM | Engine Control Module |
| 14 | BOOST | Engine Boost Solenoid |
| 15 | BACK-UP | Back-up Switch |
| 16 | INJECTORS | Fuel Injectors (Cylinder 1, 2, 3, 4) |
| 18 | LH HDLP | Driver’s Side Headlamp |
| 19 | WIPER | Wiper Mini Relay |
| 20 | HORN | Horn Micro Relay |
| 21 | RADIO | Radio |
| 22 | ABS | Anti-lock Brake System |
| 23 | RR DEFOG | Rear Defog Mini Relay |
| 38 | RUN/CRANK | Ignition 1 Mini Relay |
| 39 | IP BATT1 | Body Control Module |
| 40 | ABS | Anti-lock Brake System |
| 41 | IP BATT2 | Body Control Module |
| 43 | EPS | Electric Power Steering |
| 44 | COOLING FAN 2 | Cooling Fan Mini Relay |
| 45 | COOLING FAN 1 | Cooling Fan Mini Relay |
| 46 | CRANK | Crank |
| 47 | IP BATT 1A | Body Control Module |
| 48 | RUN (IGN 3) | Body Control Module |
| Relays | Usage | |
| 24 | A/C CLUTCH | Air Conditioning Clutch |
| 25 | HORN | Horn |
| 27 | AFTER COOLER PUMP | After Cooler Pump |
| 28 | RUN/CRANK | Body Control Module |
| 29 | POWERTRAIN | Powertrain |
| 30 | COOLING FAN 1 | Engine Cooling Fan |
| 31 | ECM CONT | Starter Solenoid |
| 32 | WIPER1 | Wiper System |
| 33 | WIPER2 | Wiper System |
| 34 | REAR DEFOG | Rear Window Defogger |
| Diodes | Usage | |
| 35 | A/C | Air Conditioning Diode |
| 37 | WIPER | Wiper Diode |
WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.