Table of Contents
The fourth-generation Lexus LS series flagship luxury sedan originally debuted in 1989. This model generation made its public debut at the North American International Auto Show in Detroit in January 2006, shortly after the unveiling of the LF-Sh hybrid concept car that showcased the flagship’s key features. This manual provides detailed fuse and relay box diagrams and circuit assignments for the 4th-generation Lexus LS 460 (XF40 series; chassis codes USF40 / UVF45) produced from 2006 through 2017.
Below are the location diagrams, photo guides, and circuit assignments for the junction blocks. Fuses protecting the “Cigarette Lighter” and “Fuel Pump” circuits are highlighted in bold.
Passenger Compartment Fuse Blocks
Component locations: #1 – Driver-side fuse block, #2 – Passenger-side fuse block
Fuse Box #1
Positioned at #1 in the diagram.
| Diagram | ||
|---|---|---|
|
||
| No. | Circuit / Function | Rating (A) |
| 1 | Instrument cluster, front/rear power seat controls, tilt and telescopic steering column, power door locks, cruise control | 10 |
| 2 | Clock, interior illumination | 10 |
| 3 | Audio system | 10 |
| 4 | Fuel filler door release, audio system, interior illumination | 10 |
| 5 | — | — |
| 6 | Smart Key system / push-button start, engine immobilizer / anti-theft system | 5 |
| 7 | Audio amplifier | 30 |
| 8 | Electric steering column lock | 20 |
| 9 | Power door locks | 10 |
| 10 | Hazard warning lights, turn signal indicators | 10 |
| 11 | Left rear door module (courtesy lights, power locks, power windows) | 25 |
| 12 | Left front door module (courtesy lights, power mirrors, door locks, power windows, heated mirrors) | 25 |
| 13 | Stop lamps (brake lights) | 5 |
| 14 | Automatic transmission, power door locks, cruise control, rear window defogger, power sunroof, seat belt pretensioners, ABS/brake control system, power headrests, auxiliary power outlet, turn signals, climate control ECU, audio system | 10 |
| 15 | Dynamic radar cruise control system | 5 |
| 16 | Starter system, climate-controlled seats (heated/ventilated) | 15 |
| 17 | Body ECU, seat belt pretensioners, starter system, tilt and telescopic steering column | 5 |
| 18 | Auxiliary power outlet | 15 |
| 19 | Power door locks | 5 |
| 20 | — | — |
| 21 | Power sunroof | 30 |
| 22 | Tilt and telescopic steering column ECU | 30 |
| 23 | Power door locks | 5 |
| 24 | Data Link Connector (OBD-II / DLC) | 10 |
| 25 | Driver power seat module | 30 |
| 26 | Driver climate-controlled seat (heated/ventilated) | 20 |
| 27 | Left rear climate-controlled seat (heated/ventilated) | 30 |
Fuse Box #2
Positioned at #2 in the diagram.
| Diagram | ||
|---|---|---|
|
||
| No. | Circuit / Function | Rating (A) |
| 1 | Tilt and telescopic steering column ECU, Smart Key system / push-button start, instrument cluster, power management ECU, Lexus Link system | 5 |
| 2 | Data Link Connector (OBD-II), Lexus Link system | 5 |
| 3 | Power door locks, front power seats, rear power seats, Variable Gear Ratio Steering (VGRS), Smart Key system, starter system, Intuitive Park Assist | 10 |
| 4 | — | — |
| 5 | Electronically Modulated Air Suspension (AHC/AVS) | 20 |
| 6 | Power door locks | 10 |
| 7 | Audio amplifier | 30 |
| 8 | Navigation system, climate control system, Lexus Link system | 20 |
| 9 | Power management ECU | 5 |
| 10 | Headlight switch, windshield wiper/washer, horn, tilt and telescopic steering, power windows, power door locks, door sunshades, power rear sunshade, rear power seat controls, steering wheel controls | 5 |
| Headlight switch, windshield wiper/washer, horn, tilt and telescopic steering, power windows, power door locks, door sunshades, power rear sunshade, rear power seat controls, steering wheel controls | 10 | |
| 10 | Power door locks | 10 |
| 12 | Right rear door module (courtesy lights, power locks, power windows) | 25 |
| 13 | Right front door module (courtesy lights, power mirrors, door locks, power windows, heated mirrors) | 25 |
| 14 | Audio system / CD changer | 5 |
| 15 | Variable Gear Ratio Steering (VGRS) | 5 |
| 16 | Audio system, navigation system, power door locks, VGRS ECU, climate control system, power headrests, seat belt pretensioners, Intuitive Park Assist, Tire Pressure Monitoring System (TPMS) | 10 |
| 17 | Climate-controlled seats (heated/ventilated) | 10 |
| 18 | Lexus LS 460 Cigarette Lighter Fuse | 15 |
| 19 | Audio system, navigation system, clock, Lexus Link system, cruise control system | 5 |
| 20 | — | — |
| 21 | — | — |
| 22 | Climate control / air conditioning system | 10 |
| 23 | Front passenger climate-controlled seat | 20 |
| 24 | Front passenger power seat module | 30 |
| 25 | Right rear power seat module | 30 |
| 26 | Front passenger power seat module | 30 |
| 27 | Right rear climate-controlled seat | 30 |
Engine Compartment Fuse Blocks
Component locations.
Fuse Box #1
(Sample illustration)
| Diagram | ||
|---|---|---|
|
||
| No. | Circuit Protected | Rating (A) |
| 1 | Windshield wiper de-icer | 25 |
| 2 | Windshield wipers | 30 |
| 3 | ABS, Vehicle Stability Control (VSC), Vehicle Dynamics Integrated Management (VDIM) | 10 |
| 4 | Smart Key system / push-button start | 25 |
| 5 | Electric Power Steering (EPS) | 10 |
| 6 | High beam headlights, horn | 30 |
| 7 | Adaptive Front-lighting System (AFS), high beam headlights, parking lights, horn, security alarm siren, windshield washer, headlight washers | 10 |
| 8 | Charging system, Electric Power Steering (EPS), radiator cooling fan, Adaptive Front-lighting System (AFS) | 10 |
| 9 | Low beam headlight (Left) | 15 |
| 10 | Anti-lock Braking System (ABS) | 10 |
| 11 | Low beam headlight (Right) | 15 |
| 12 | Multiport Fuel Injection (MFI) / Sequential Multiport Fuel Injection (SFI) system | 10 |
| 13 | Dynamic radar cruise control system | 10 |
| 14 | Multiport Fuel Injection (MFI) / Sequential Multiport Fuel Injection (SFI) system, electronically controlled brake system, Supplemental Restraint System (SRS) airbags | 10 |
| 15 | Multiport Fuel Injection (MFI) / Sequential Multiport Fuel Injection (SFI) system, stop lamps, Pre-Collision seat belts, charging system | 10 |
| 16 | Fuses: “ECU-B”, “D MPX-B 1”, “D MPX-B 2”, “P MPX-B”, “RR MPX-B 1”, “RR MPX-B 2”, “DOME” | 30 |
| 17 | High beam headlights, parking lights, horn, security alarm siren, windshield washer, headlight washers, Pre-Collision seat belts | 10 |
| 18 | Air-fuel ratio (A/F) sensor | 15 |
| 19 | Multiport Fuel Injection (MFI) / Sequential Multiport Fuel Injection (SFI) system | 25 |
| 20 | Windshield washer, security alarm siren, headlight washers, parking lights | 20 |
| 21 | Multiport Fuel Injection (MFI) / Sequential Multiport Fuel Injection (SFI) system | 25 |
| 22 | Fuel injection system | 10 |
| 23 | Front fog lights | 15 |
| 24 | Air conditioning compressor, radiator cooling fan | 10 |
| 25 | Automatic headlight leveling system | 10 |
| 26 | Fuses: “P IG2”, “P RR-IG2” | 10 |
| 27 | — | — |
| 28 | Fuel injectors | 10 |
| 29 | — | — |
| 30 | — | — |
| 31 | — | — |
| 32 | Fuses: “P MPX-B”, “RR ECU-B”, “RR MPX-B1”, “RR MPX-B2” | 30 |
| 33 | Electronically controlled brake system | 5 |
| 34 | Anti-lock Braking System (ABS) | 10 |
| 35 | Multiport Fuel Injection (MFI) / Sequential Multiport Fuel Injection (SFI) system | 25 |
| 36 | 25 | |
| 37 | 10 | |
| 38 | 10 | |
| 39 | Starter motor | 30 |
| 40 | Anti-lock Braking System (ABS) | 50 |
| 41 | 50 | |
| 42 | Variable Valve Timing system (VVT-i / VVT-iE) | 40 |
| Relay | ||
| R1 | Ignition Main Relay (IG1 / IG2) | |
| R2 | ||
| R3 | Engine Control Module / EFI Main 2 Relay (EFI MAIN2) | |
| R4 | Fuel Pump Relay (Circuit Opening / Fuel Pump) | |
| R5 | ||
| R6 | Variable Valve Timing (VVT) Relay – Bank 1 (LH) | |
| R7 | Engine Control Module Main Relay (EFI MAIN) | |
| R8 | Starter Cut Relay (ST CUT) | |
| R9 | Variable Valve Timing (VVT) Relay – Bank 2 (RH) | |
| R10 | Starter Relay (ST) | |
Fuse Box #2
Positioned at #2 in the diagram.
| Diagram | ||
|---|---|---|
|
||
| No. | Protected Circuit | Rating (A) |
| F1 | Headlight washer pump | 30 |
| F2 | Auxiliary PTC heater | 50 |
| F3 | 40 | |
| F4 | From 08/08 production: Condenser fan | 40 |
| F5 | HVAC blower motor | 50 |
| F6 | From 08/08 production: Air Suspension | 40 |
| F7 | — | 30 |
| F8 | Main power distribution | 50 |
| F9 | From 08/08 production: Auxiliary PTC heater | 60 |
| F10 | Main power distribution | 80 |
| F11 | — | 80 |
| F12 | Radiator cooling fan motor | 80 |
| F13 | From 08/08 production: Main power distribution | 60 |
| F14 | Main power distribution | 180 |
| F15 | — | — |
| F16 | — | — |
| F17 | From 08/08 production: Unused | — |
| F18 | Main power distribution | 30 |
| F19 | Electric Power Steering (EPS) ECU | 40 |
| F20 | Main power distribution | 40 |
| F21 | 40 | |
| F22 | 40 | |
| F23 | 30 | |
| F24 | From 08/08 production: Engine management system (40A) | 40 |
| F25 | From 08/08 production: Unused | — |
| F26 | — | — |
| F27 | 80 | |
| F28 | Engine management system (ECM) | 80 |
| F29 | From 08/08 production: Electric Power Steering (EPS) | 80 |
| F30 | Auxiliary PTC heater | 25 |
| F31 | 25 | |
| F32 | Battery state-of-charge sensor / module | 5 |
| F33 | — | |
| Relay | ||
| 1 | Radiator cooling fan relay | |
| 2 | Air suspension compressor relay | |
Auxiliary Relay Blocks
Auxiliary relay block locations and circuit descriptions.
| Relay Block #1 | |
|
|
|
|
| No. | Protected Circuit |
| 1 | — |
| R1 | Windshield wiper de-icer relay (DEICER) |
| R2 | ABS motor relay #2 (ABS MTR2) |
| R3 | Rear window defogger relay (DEFOG) |
| Relay Block #2 | |
|
|
| No. | Protected Circuit |
| R1 | Auxiliary PTC heater relay #2 |
| R2 | Auxiliary PTC heater relay #1 |
| R3 | Auxiliary PTC heater relay #3 |
Luggage Compartment (Trunk) Fuse Block
Located on the left side of the luggage compartment, behind the protective trim panel.
General view of fuse panel.
| Diagram | ||
|---|---|---|
|
||
| No. | Circuit / Function | Rating (A) |
| 1 | Audio system, Rear Seat Entertainment (RSE) system, power trunk lid | 10 |
| 2 | Power door locks, rear power seats, interior illumination, security alarm siren, power trunk lid | 5 |
| 3 | — | 5 |
| 4 | — | — |
| 5 | Cooling fan | 20 |
| 6 | 5 | |
| 7 | Electronic Parking Brake (EPB) | 30 |
| 8 | Luggage compartment lighting, seat belt buckle illumination | 5 |
| 9 | Anti-lock Braking System (ABS), A/C condenser fan | 10 |
| 8 | Stop lamps (brake lights), reverse lamps | 5 |
| 10 | ||
| 11 | Stop lamps, high-mount stop lamp | 10 |
| 12 | — | — |
| 13 | Tail lamps, license plate lamps | 5 |
| 14 | Climate-controlled seats (heated/ventilated) | 10 |
| 15 | Rear power seat module | 10 |
| 16 | Power door locks, cool box / rear refrigerator, rear climate control | 10 |
| 17 | A/C condenser fan, brake control system, rear power seats | 5 |
| 18 | Audio system, Rear Seat Entertainment (RSE) system | 5 |
| 19 | Lexus LS 460 Rear Cigarette Lighter Fuse | 15 |
| 20 | Auxiliary power outlet | 15 |
| 21 | Rear power seat module | 30 |
| 22 | Power shoulder belt anchor adjuster | 10 |
| 23 | Power rear sunshade | 10 |
| 24 | Pre-Collision seat belt pretensioners | 30 |
| 25 | Power trunk lid motor | 30 |
| 26 | Fuel filler door release, power trunk lid | 15 |
| 27 | — | — |