Engine Compartment Junction & Relay Blocks

NOTE: Numerous fusible link, junction and relay blocks are located in the engine compartment. See Fig 1. For identification of current flow, see Fig 2.

Component Locations

Fusible link block is located at right side of engine compartment, see Fig 1. Fusible link block contains relays. For identification of fusible link block components, see Fig 3. For identification of fusible link block fuse components, see table below. The fusible link block is the connection point for various wiring harnesses. For wiring diagrams of fusible link block circuit components, see appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
Engine compartment No. 1 relay block is located at right rear of engine compartment, see Fig 1. Engine compartment No. 1 relay block contains fuses and relays. For identification of Engine compartment No. 1 relay block components, see Fig 4. For identification of Engine compartment No. 1 relay block fuse components, see table below. The engine compartment No. 1 relay block is the connection point for various wiring harnesses. For wiring diagrams of components, see appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
Engine compartment No. 2 relay block is located at left side of engine compartment, see Fig 1. Engine compartment No. 2 relay block contains relays. For identification of engine compartment No. 2 relay block components, see Fig 5. The engine compartment No. 2 relay block is the connection point for various wiring harnesses. For wiring diagrams of engine compartment No. 2 relay block circuit components, see appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
Engine compartment No. 3 relay block is located at left side of engine compartment, see Fig 1. Engine compartment No. 3 relay block contains a fuse and relays. For identification of engine compartment No. 3 relay block components, see Fig 6. For identification of engine compartment No. 3 relay block fuse components, see table below. The engine compartment No. 3 relay block is the connection point for various wiring harnesses. For wiring diagrams of engine compartment No. 3 relay block circuit components, see appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
Headlight cleaner control relay is located at left side of engine compartment, see Fig 1. For wiring diagrams of headlight cleaner control relay circuit components, see WIPER/ WASHER in appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Fig 1: Locating Engine Compartment Fusible Link, Junction & Relay Blocks

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

ENGINE COMPARTMENT RELAY IDENTIFICATION

RELAY DESCRIPTION
Headlight Cleaner Control Relay

Fig 2: Current Flow Chart

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Fig 3: Identifying Fusible Link Block Fuses And Relays

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FUSIBLE LINK BLOCK RELAY IDENTIFICATION

RELAY DESCRIPTION
Fan Relay
Air Suspension Relay
STARTER Relay

FUSIBLE LINK BLOCK FUSE IDENTIFICATION LEGEND

Fuse		System
5A	ALT-S	Charging
30A	AM2	Engine Control Starting and Ignition
40A	ABS1	Dynamic Laser Cruise Control VSC and PPS
40A	ABS2	Dynamic Laser Cruise Control VSC and PPS
40A	AIR SUS	Electronic Modulated Air Suspension
40A	DEFOG	Rear Window Defogger
50A	FAN	Radiator Fan
50A	HEATER	Automatic Air Conditioning (Front)
50A	LUG J/B	Automatic Light Control Back-Up Light Dynamic Laser Cruise Control Light Auto Turn Off Multiplex Communication System (J/B ECU) Rear Air Conditioning Stop Light Taillight
140A	ALT	Charging Multiplex Communication System (J/B ECU)

Fig 4: Identifying Engine Compartment No. 1 Relay Block Components

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

ENGINE COMPARTMENT NO. 1 RELAY BLOCK RELAY IDENTIFICATION

RELAY DESCRIPTION
F/PMP Relay
A/C COMP Relay
C/OPN Relay
IG1 Relay
Head LP Relay
IG2 Relay
EFI Main Relay

ENGINE COMPARTMENT NO. 1 RELAY BLOCK FUSE IDENTIFICATION LEGEND

Fuse		System
7.5A	A/CIG	Automatic Air Conditioning (Front)
7.5A	EFI NO.2	Engine Control
7.5A	FRIG	Automatic Air Conditioning (Front) Back-Up Light Charging Cruise Control Dynamic Laser Cruise Control Electronically Controlled Transmission and A/T Indicator Headlight Cleaner LEXUS Park Assist (Clearance Sonar) Power Seat (Rear Passenger's Seat) Radiator Fan Rear Window Defogger Remote Control Mirror
7.5A	IGN	Cruise Control Dynamic Laser Cruise Control Electronically Controlled Transmission and A/T Indicator Engine Control
7.5A	STA	Electronically Controlled Transmission and A/T Indicator Engine Control Starting and Ignition
7.5A	TAIL	Automatic Light Control Light Auto Turn Off Multiplex Communication System (J/B ECU) Taillight Theft Deterrent
10A	ETCS	Cruise Control Dynamic Laser Cruise Control Electronically Controlled Transmission and A/T indicator Engine Control
10A	HORN	Horn Multiplex Communication System (J/B ECU) Theft Deterrent
10A	INJ	Engine Control Starting and Ignition
15A	FR FOG	Front Fog Light Multiplex Communication System (J/B ECU)
15A	H-LP L LWR	Headlight Multiplex Communication System (J/B ECU)
15A	H-LP R LWR	Headlight Multiplex Communication System (J/B ECU)
20A	H-LP HI	Headlight Multiplex Communication System (J/B ECU)
20A	WASHER	Multiplex Communication System (J/B ECU) Wiper and Washer
30A	EFI NO.1	Cruise Control Dynamic Laser Cruise Control Electronically Controlled Transmission and A/T Indicator Engine Control
30A	H-LP, CLN	Headlight Cleaner
30A	WIP	Multiplex Communication System (J/B ECU) Wiper and Washer

Fig 5: Identifying Engine Compartment No. 2 Relay Block Components

ENGINE COMPARTMENT NO. 2 RELAY BLOCK RELAY IDENTIFICATION

RELAY DESCRIPTION
Defog Relay

Fig 6: Identifying Engine Compartment No. 3 Relay Block Components

ENGINE COMPARTMENT NO. 3 RELAY BLOCK RELAY IDENTIFICATION

RELAY DESCRIPTION
ABS MTR Relay
ABS SOL Relay

ENGINE COMPARTMENT NO. 3 RELAY BLOCK FUSE IDENTIFICATION LEGEND

Fuse		System
7.5A	ABS3	VSC and PPS