The Chevrolet Cobalt (2004-2011) is a compact car that features a well-organized electrical system managed by fuses and relays to ensure the smooth operation of various components.
The fuse box in the Cobalt is located in two main areas: one in the engine compartment and another inside the vehicle. The engine compartment fuse box is responsible for high-power systems like the engine control, headlights, and cooling fans. The interior fuse box manages lower-power systems such as the radio, power windows, and interior lighting. Fuses protect the electrical circuits by breaking the flow of current in case of an overload or short circuit.
The relays in the Cobalt control key components, including the fuel pump, starter, and cooling fans. Relays act as electrical switches that enable low-power circuits to control higher-power systems. If a relay fails, the associated component may not function properly, such as the engine failing to start due to a faulty starter relay.
Regular inspection of both fuses and relays is essential to maintaining the Cobalt’s electrical systems and ensuring the vehicle operates without interruptions or malfunctions.
MUST READ: DYI – How to Check Car Fuses?
(2004-2011) Chevrolet Cobalt fuse box and relay with Diagram
WARNING
- Never replace a fuse with one that has a higher amperage rating.
- A fuse with a too-high amperage could damage the electrical part and cause a fire.
- On no account should fuses be repaired (e.g. patched up with tin foil or wire) as this may cause serious damage elsewhere in the electrical circuit or cause a fire.
- If a fuse blows repeatedly, do not keep replacing it. Instead, have the cause for the repeated short circuit or overload tracked and fixed.
- Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.
Chevrolet Cobalt 2004-2011 fuse assignment
- Cigar lighter (power outlet) fuse in the Chevrolet Cobalt is located in the Engine Compartment fuse box (see fuse “OUTLET” or “LTR”).
Year of production: from 2004, 2005, 2006, 2007, 2008, 2009, 2010 2011
Passenger Compartment Fuse Box
Fuse Box Location
It is located on the passenger side of the vehicle, on the lower portion of the instrument panel near the floor, behind the cover.
Fuse box diagram
Assignment of the fuses in the Passenger Compartment
| № | Name | Description | Rating |
|---|---|---|---|
| 1 | FUSE PULLER | – | – |
| 2 | EMPTY | Not Used | – |
| 3 | EMPTY | Not Used | – |
| 4 | EMPTY | Not Used | – |
| 5 | EMPTY | Not Used | – |
| 6 | AMP Fuse | Audio Amplifier (UQ3) | 20A |
| 7 | CLSTR Fuse | Instrument Panel Cluster (IPC) | 10A |
| 8 | IGN SW/PK3+ Fuse | Ignition Switch | 2A |
| 9 | STOP LP Fuse | Not Used | 10A |
| 10 | HVAC/PK3+ Fuse | HVAC Control Module, Theft Deterrent Control Module | 10A |
| 11 | EMPTY | – | – |
| 12 | SPARE | Not Used | 20A |
| 13 | AIRBAG Fuse | Inflatable Restraint Front Passenger Presence System (PPS) Module, Inflatable Restraint Sensing and Diagnostic Module (SDM) | 10A |
| 14 | SPARE | Not Used | 10A |
| 15 | WPR Fuse | Windshield Wiper/Washer Switch, Turbocharger Boost Gage (INf) | 10A |
| 16 | HVAC/IP IGN Fuse | Clutch Pedal Start Switch (M/T), Instrument Panel Cluster (IPC), Heated Seat Switches (KA1), HVAC Control Module, Inflatable Restraint Passenger Air Bag On/Off Indicator | 10A |
| 17 | WNDW RAP Fuse | Not Used | 2A |
| 18 | EMPTY | – | – |
| 19 | EPS/STR WHL CNTRL Fuse | Electronic Power Steering Control Module (PSCM), Steering Wheel Controls – Left (K34, UK3) | 2A |
| 20 | S ROOF Fuse | Sunroof Switch | 15A |
| 21 | SPARE | Not Used | 20A |
| 22 | EMPTY | – | – |
| 23 | RDO Fuse | Radio, Remote Control Door Lock Receiver (RCDLR) (AUO) | 15A |
| 24 | XM/ONSTAR Fuse | Vehicle Communication Interface Module (VCIM) (UE1), Digital Radio Receiver (DRR) | 10A |
| 25 | ECM/TCM Fuse | Engine Control Module (ECM), Transmission Control Module (TCM) | 10A |
| 26 | DR LCK Fuse | DOOR LOCK PCB Relay, DOOR UNLOCK PCB Relay, DR DOOR UNLOCK PCB Relay, INT LIGHT PCB Relay | 15A |
| 27 | INT LIGHT Fuse | INT LIGHT PCB Relay | 10A |
| 28 | SWC BKLT Fuse | Steering Wheel Controls | 2A |
| 29 | PWR WNDW Fuse | Driver Window Switch, Front Passenger Window Switch | 30A |
| 30 | HVAC Relay | Blower Motor | – |
| 31 | EMPTY | – | – |
| 32 | RAP Relay | PWR WNDW Fuse 29, S ROOF Fuse 20 | – |
| Printed Circuit Board (PCB) Relays – Not Serviceable: | |||
| – | INT LIGHT PCB Relay | Dome Lamp, Inside Rearview Mirror | – |
| – | DOOR LOCK PCB Relay | BCM Logic, Door Latches | – |
| – | DOOR UNLOCK PCB Relay | BCM Logic, Door Latches | – |
| – | DR DOOR UNLOCK PCB Relay | BCM Logic, Driver Door Latch | – |
| – | IGN 3 PCB Relay | Blower Motor | – |
Engine Compartment Fuse Box
Fuse Box Location
It is located in the engine compartment, under the cover.
Fuse box diagram (Type 1)
Assignment of the fuses and relay in the Engine Compartment Fuse Box (Type 1)
| Name | Description | Rating |
|---|---|---|
| ABS | Electronic Brake Control Module (EBCM) | 40A |
| ABS2 | Electronic Brake Control Module (EBCM) | 10A |
| ABS3 | Electronic Brake Control Module (EBCM) | 20A |
| A/C CLTCH | A/C Compressor Clutch (C60) | 10A |
| A/C CLTCH Relay | A/C CLTCH | – |
| AIR PUMP | AIR PUMP Relay (NU6) | 40A |
| AIR PUMP Relay | Secondary Air Injection (AIR) Pump (NU6) | – |
| AIR SOL | Secondary Air Injection (AIR) Solenoid (NU6) | 10A |
| AIR SOL/COOL FAN2 Relay | AIR SOL (L61+NU6), Cooling Fan – 2 (LNF) | – |
| BCK UP | Back Up Lamp Switch (M/T), Park Neutral Position (PNP) Switch (AT) | 10A |
| BCM2 | AMP 6, CLSTR 7, HVAC/PK3+ 10, IGN SW/PK3+ 8, STOP LP 9 (BCM s) | 40A |
| BCM3 | HVAC Relay 30 (BCM) | 30A |
| CHMSL | CHMSL Relay | 10A |
| CHMSL Relay | Engine Control Module (ECM), Transmission Control Module (TCM), Center High Mounted Stop Lamp (CHMSL) | – |
| CNSTR VENT | Evaporative Emission (EVAP) Canister Vent Solenoid | 10A |
| COOL FAN 1 | COOL FAN1 Relay | 30A |
| COOL FAN 2 | COOL FAN2 Relay | 30A |
| COOL FAN 1 Relay | Cooling Fan Diode (L61), Cooling Fan Motor (L61), Cooling Fan 1 (LNF), Cooling Fan Resistor (LE5) | – |
| COOL FAN 2 (Turbo) COOL FANS Relay | Cooling Fan | – |
| CRNK | CRNK Relay | 30A |
| CRNK Relay | Starter | – |
| DLC | Data Link Connector (DLC) | 15A |
| DRL | RT and LT LO BEAM s | 10A |
| ECM/TRANS | Engine Control Module (ECM), Transmission Control Module (TCM) (MN5) | 15A |
| ENG VLV SOL (LNF) | Turbocharger Wastegate Solenoid, Turbocharger Bypass Valve Solenoid, Camshaft Position (CMP) Actuator Solenoid – Intake, Camshaft Position (CMP) Actuator Solenoid – Exhaust | 10A |
| EXH | Evaporative Emission (EVAP) Canister Purge Solenoid, HO2S Sensors, Mass Air Flow (MAF)/Intake Air Temperature (IAT) Sensor | 10A |
| EPS | Electronic Power Steering (EPS) Control Module (PSCM) | 60A |
| FOG LAMP | Left Front and Right Front Fog Lamps (T37) | 15A |
| FUEL PUMP | Fuel Pump and Sender Assembly | 15A |
| FUEL PUMP Relay | FUEL PUMP | – |
| HORN | Horn | 10A |
| INJ | Fuel Injectors, Ignition Coil/Modules | 15A |
| IP IGN | Body Control Module (BCM) | 20A |
| LT HI BEAM | Left Headlamp | 10A |
| LT LO BEAM | Left Headlamp | 10A |
| MIR/UGDO | Outside Rearview Mirror Switch (DG7) | 5A |
| OUTLET | Cigar Lighter (DT4), Auxiliary Power Outlet | 20A |
| PCM/ECM | Engine Control Module (ECM) | 20A |
| PRK LAMP | Body Control Module (BCM), License Lamps, Marker Lamps Park/Turn/DRL Signal Lamps, Tail/Stop and Turn Signal Lamps | 10A |
| PWR/TRN Relay | EXH , INJ , PCM/ECM , ENG VLV SOL | – |
| REAR DEFOG | REAR DEFOG Relay | 40A |
| REAR DEFOG Relay | Rear Window Defogger Grid | – |
| RT LO BEAM | Right Headlamp | 10A |
| RT HI BEAM | Right Headlamp | 10A |
| RUN/CRNK Relay | ECM/TRANS , IP IGN , BCK UP , ABS2 | – |
| SDM | Inflatable Restraint Sensing and Diagnostic Module (SDM), Body Control Module (BCM) | 10A |
| TRUNK/HEATED SEATS | TRUNK PCB Relay, Driver and Passenger Heated Seat Modules | 20A |
| WPR | WPR ON/OFF Relay | 25A |
| WPR ON/OFF Relay | WPR HI/LO Relay | – |
| WPR HI/LO Relay | Windshield Wiper Motor | – |
| Printed Circuit Board (PCB) Relays – Not Serviceable: | ||
| DRL PCB Relay | DRL | – |
| FOG LAMP PCB Relay | FOG LAMP | – |
| HI BEAM PCB Relay | LT HI BEAM, RT HI BEAM | – |
| HORN PCB Relay | HORN | – |
| LO BEAM PCB Relay | LT LO BEAM, RT LO BEAM | – |
| PRK LAMP PCB Relay | PRK LAMP | – |
| TRUNK PCB Relay | Rear Compartment Lid Release Actuator | – |
Fuse box diagram (Type 2)
Assignment of the fuses and relay in the Engine Compartment Fuse Box (Type 2)
| Name | Description | Rating |
|---|---|---|
| A/C CLTCH | A/C Compressor Clutch (C60) | 10A |
| A/C CLTCH Relay | A/C CLTCH | – |
| AIR SOL | Secondary Air Injection (AIR) Solenoid (w/NU6) | 15A |
| AIR SOL Relay | AIR SOL(w/NU6) | – |
| ABS | Electronic Brake Control Module (EBCM) | 50A |
| ABS 2 | Electronic Brake Control Module (EBCM) | 10A |
| AIR PMP | AIR PMP | 40A |
| AIR PMP Relay | AIR PMP Relay | – |
| BCK UP | Back Up Lamp Switch (M/T), Park Neutral Position (PNP) Switch (A/T) | 10A |
| BCM 2 | Body Control Module (BCM) | 40A |
| BCM 3 | Body Control Module (BCM) | 30A |
| CNSTR VENT | Evaporative Emission (EVAP) Canister Vent Solenoid | 10A |
| COOL/FAN1 | Cooling Fan 1 | 30A |
| COOL/FAN2 | Cooling Fan 2 | 30A |
| COOL/FAN 1 Relay | Cooling Fan | – |
| COOLING FAN 2 Relay | Cooling Fan | – |
| CRNK | Crank Relay | 30A |
| CRNK Relay | Starter | – |
| ECM/TRANS | Transmission Control Module (TCM), Engine Control Module (ECM) (L61) | 15A |
| EMISN | Heated Oxygen Sensor (HO2S) Sensor 1, Heated Oxygen Sensor (HO2S) Sensor 2, Evaporative Emission (EVAP) Canister Purge Solenoid, Clutch Pedal Position (CPP) Switch, Mass Air Flow (MAF).Inlet Air Temperature (IAT) Sensor | 10A |
| EPS | Electric Power Steering Control Module | 60A |
| FOG LP | LF Fog Lamp, RF Fog Lamp | 15A |
| FUEL PMP | Fuel Pump and Sender Assembly | 15A |
| FUEL PMP Relay | FUEL PUMP , Fuel Pump and Sender Assembly | – |
| HORN | Horn | 10A |
| HTD SEATS | Heated Seat Module – Driver, Heated Seat Module – Passenger | 20A |
| INJ | Fuel Injector 1, Fuel Injector 2, Fuel Injector 3, Fuel Injector 4, Ignition Control Module (ICM) | 10A |
| IP IGN | Body Control Module | 20A |
| LH HI BEAM | Left Headlamp | 10A |
| LH LO BEAM | Left Headlamp | 10A |
| LTR | Cigar Lighter (DT4), Data Link Connector (DLC) | 15A |
| MIR (S) | Outside Rearview Mirror Switch (DG7) | 5A |
| PCM/ECM | Engine Control Module (ECM) | 15A |
| PRK LPS | Lamp Assembly – LF, Lamp Assembly – RF, Stop/Tail and Turn Signal Lamp – Left,Body Control Module (BCM), Side Marker Lamp – Left, Side Marker Lamp – Right, License Lamp, Stop/Tail and Turn Signal Lamp – Right | 15A |
| PRK/NEUT | Park Neutral Position (PNP) Switch (MN5) | 10A |
| PWR/TRN Relay | Power Train Relay | – |
| RH LO BEAM | Right Headlamp | 10A |
| RH HI BEAM | Right Headlamp | 10A |
| S BAND/ONSTAR | Vehicle Communication Interface Module (VCIM) (UE1), Digital Radio Receiver (U2K) | 10A |
| RDFG | RDFG Relay | 40A |
| RDFG Relay | Rear Window Defogger Grid | – |
| RUN/CRNK Relay | ECM/TRANS , IP IGN , BCK UP , ABS , | – |
| TRUNK/OUTLET | TRUNK RELEASE PCB Relay, Auxiliary Power Outlet – Console | 20A |
| WPR | WPRr Relay | 25A |
| WPR 1 Relay | WPR 2 Relay | – |
| WPR 2 Relay | Windshield Wiper Motor | – |
| Printed Circuit Board (PCB) Relays – Not Serviceable: | ||
| FOG LP PCB Relay | FOG LP | – |
| HI BEAM PCB Relay | LH HI BEAM , RH HI BEAM | – |
| HORN PCB Relay | HORN | – |
| LO BEAM PCB Relay | LH LO BEAM , RH LO BEAM | – |
| PRK LPS PCB Relay | PRK LPS | – |
| TRUNK RELEASE PCB Relay | Rear Compartment Lid Release Actuator |
Conclusion
For owners and enthusiasts of classic Chevrolet Cobalt 2004-2011, understanding the fuse box and relay systems is essential for vehicle maintenance. Regular inspection and maintenance of these components helped ensure the vehicle’s longevity and reliability, preserving its status as a symbol of Chevrolet’s craftsmanship and innovation in the automotive industry during that era.
