Engine Compartment Junction & Relay Blocks
WARNING: This page is about a different car, the 2003 Toyota Prius and 2002 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Junction, relay and fusible link blocks are located in engine compartment. See Fig 1. For description of electrical power distribution, see Fig 2.
- Engine compartment fusible link block No. 1 is located at left side of engine compartment. See Fig 1. For identification of components, see Fig 3. For identification of protected circuits, see table below. For wiring diagrams of fusible link block No. 1 circuits, see appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
- Engine compartment junction block is located on left side of engine compartment. See Fig 1. For identification of components, see Fig 4. For identification of protected circuits, see table below. For wiring diagrams of junction block circuits, see appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
- The engine compartment relay block No. 2 is located at rear of engine compartment. See Fig 5. For wiring diagrams of relay block No. 2 circuits, see appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
- The engine compartment relay block No. 3 is located at right rear of engine compartment. Relay block No. 3 contains relays and fuses. See Fig 5. For identification of protected circuits, see table below. For wiring diagrams of relay block No. 3 circuits, see appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
VEHICLE OVERVIEW RELAY IDENTIFICATION
| RELAY DESCRIPTION |
|---|
| Engine Room Relay Block No. 2 |
| System Main Relay |
| Battery Fan Relay |
FUSIBLE LINK BLOCK NO. 1 FUSE IDENTIFICATION LEGEND
| Fuse | System | |
|---|---|---|
| 100A | DC/DC | Illumination Key Reminder and Light Reminder Buzzer Light Auto Turn Off Taillight TOYOTA Hybrid System |
ENGINE COMPARTMENT JUNCTION BLOCK RELAY IDENTIFICATION
| RELAY NUMBER | RELAY DESCRIPTION |
|---|---|
| A. | Fan No. 1 Relay |
| B. | Fan No. 2 Relay |
| C. | Fan No. 3 Relay |
| D. | IG2 Relay |
| E. | Horn Relay |
| F. | HTR Relay |
| G. | EFI Relay |
| H. | CLR MG Relay |
| I. | Head Relay |
| J. | CIR OPN Relay |
| K. | DIM Relay (w/o Daytime Running Light) |
ENGINE COMPARTMENT JUNCTION BLOCK FUSE IDENTIFICATION LEGEND
| Fuse | System | |
|---|---|---|
| 10A | BATT FAN | TOYOTA Hybrid System |
| 10A | HEAD (LH) | Headlight (w/o Daytime Running Light) |
| 10A | HEAD (RH) | Headlight (w/o Daytime Running Light) |
| 10A | HEAD HI (LH) | Headlight (w/ Daytime Running Light) |
| 10A | HEAD HI (RH) | Headlight (w/ Daytime Running Light) |
| 10A | HEAD LO (LH) | Headlight (w/ Daytime Running Light) |
| 10A | HEAD LO (RH) | Headlight (w/ Daytime Running Light) |
| 10A | HORN | Horn Theft Deterrent |
| 10A | TURN-HAZ | Turn Signal and Hazard Warning Light |
| 15A | AM2 | ABS Engine Control Hybrid Vehicle Immobiliser System SRS TOYOTA Hybrid System |
| 15A | DOME | Combination Meter Door Lock Control Headlight (w/ Daytime Running Light) Headlight (w/o Daytime Running Light) Illumination Interior Light Key Reminder and Light Reminder Buzzer Navigation System Power Window Radio and Player Seat Belt Warning Theft Deterrent TOYOTA Hybrid System Wireless Door Lock Control |
| 15A | EFI | Engine Control |
| 15A | THRO | Engine Control |
| 20A | ABS NO.3 | ABS |
| 20A | HV | TOYOTA Hybrid System |
| 30A | ABS NO.2 | ABS |
| 30A | CDS FAN | Radiator Fan and Condenser Fan |
| 30A | HEAD | Headlight (w/ Daytime Running Light) Key Reminder and Light Reminder Buzzer Light Auto Turn Off |
| 30A | RDI | Radiator Fan and Condenser Fan |
| 50A | HTR | Air Conditioning |
ENGINE COMPARTMENT RELAY BLOCK NO. 2 & 3 RELAY IDENTIFICATION
| RELAY NUMBER | RELAY DESCRIPTION |
|---|---|
| Engine Room Relay Block No. 3: | |
| A. | A/C W/P Relay |
| B. | ABS SOL Relay |
| C. | DRL Relay Main |
| D. | HTR2 Relay |
| E. | HTR1 Relay |
| G. | HTR3 Relay |
| H. | EPMS Relay |
| Engine Room Relay Block No. 2 | |
| A. | IGCT Relay |
| B. | HYDRO MTR No. 2 Relay |
| C. | HYDRO MTR No. 1 Relay |
ENGINE COMPARTMENT RELAY BLOCK NO. 3 FUSE IDENTIFICATION LEGEND
| Fuse | System | |
|---|---|---|
| 7.5A | DRL | Headlight (w/ Daytime Running Light) |
| 10A | ABS NO.4 | ABS |
| 30A | HTR1 | Air Conditioning |
| 30A | HTR2 | Air Conditioning |
| 40A | ABS NO.1 | ABS |
| 50A | EMPS | EMPS |
| 50A | HTR3 | Air Conditioning |