LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Honda >> 2020 >> Ridgeline RTL, AWD >> Repair and Diagnosis (Single Page) >> Quick Lookups >> Electrical Component Locations >> Electrical System - Testing & Troubleshooting >> Fuse To Components Index >> Fuse to Components Index (2020) >> Under-Hood Fuse/Relay Box
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Under-Hood Fuse/Relay Box

Fig 1: Under-Hood Fuse/Relay Box Component Locations
GHH451879Courtesy of HONDA, U.S.A., INC.
Fuse Number Amps Component(s) or Circuit(s) Protected Feature
A1-1* 70 A AC inverter unit (via AC inverter relay) *: With AC power outlet
A1-2* 30 A Rear blower motor (via rear blower motor relay) *: Without AC power outlet
A1-3 40 A VSA modulator-control unit  
A1-4 20 A VSA modulator-control unit  
A1-5* 30 A Radiator fan motor (via radiator fan relay) *: Without AC power outlet
A1-6 150 A Alternator,

No. A2-1, No. A2-2, No. A2-3, No. A2-6, No. A2-7, No. A2-8* 2, No. A2-10* 1, No. A3-1* 1, No. A3-4* 1, No. A21, No. A22, No. A23, No. A24, No. A25, No. A26* 3, No. A27* 4, No. A28, and No. A29 fuses in the under-hood fuse/relay box

*1: With AC power outlet
*2: Without AC power outlet
*3: With AC power outlet and front fog light or without AC power outlet
*4: With heated steering wheel
A2-1 30 A A/C condenser fan motor (via A/C condenser fan relay)  
A2-2 30 A Windshield wiper motor (via windshield wiper motor intermittent relay circuit and windshield wiper motor high/low relay circuit (built into the relay circuit board))  
A2-3 20 A Windshield washer motor relay,

Windshield washer motor (via windshield washer motor relay)

 
A2-4 20 A No. A5 and No. A7 fuses in the under-hood fuse/relay box  
A2-5 20 A Engine mount control unit (via active control engine mount (ACM) control relay)  
A2-6 40 A Front blower motor (via front blower motor relay)  
A2-7 30 A Stereo amplifier  
A2-8* 30 A Rear window defogger (via rear window defogger relay) *: Without AC power outlet
A2-9 40 A Not used  
A2-10* 30 A Rear window defogger (via rear window defogger relay) *: With AC power outlet
A2-11 20 A Not used  
A3-1* 30 A Rear blower motor (via rear blower motor relay) *: With AC power outlet
A3-2 30 A Not used  
A3-3 30 A Not used  
A3-4* 30 A Radiator fan motor (via radiator fan relay) *: With AC power outlet
A4 10 A Brake lights (via brake light relay)* 1,

Brake lights (via brake pedal position switch and brake light relay)* 1,

High mount brake light (via brake light relay)* 1,

High mount brake light (via brake pedal position switch and brake light relay)* 1,

Keyless access/TPMS control unit (via brake pedal position switch)* 1,

MICU (via brake pedal position switch)* 1,

PCM (via brake pedal position switch)* 1,

Trailer electric brake connector (via brake pedal position switch)* 1,

Trailer lighting control unit (via brake light relay)* 1,

Trailer lighting control unit (via brake pedal position switch and brake light relay)* 1,

VSA modulator-control unit (via brake light relay)* 1,

VSA modulator-control unit (via brake pedal position switch and brake light relay)* 1

*1: With AC power outlet
*2: Without AC power outlet
No. C25 and No. C27 fuses in the under-dash fuse/relay box (via small light relay circuit (built into the relay circuit board))* 2,

Small light relay circuit (built into the relay circuit board)* 2

A5 10 A Tailgate latch synchronizer actuator relay (LOCK), Tailgate latch synchronizer actuator (via tailgate latch synchronizer actuator relay (LOCK))  
A6 10 A No. C25 and No. C27 fuses in the under-dash fuse/relay box (via small light relay circuit (built into the relay circuit board))* 1,

Small light relay circuit (built into the relay circuit board)* 1

*1: With AC power outlet
*2: Without AC power outlet
Brake lights (via brake light relay)* 2,

Brake lights (via brake pedal position switch and brake light relay)* 2,

High mount brake light (via brake light relay)* 2,

High mount brake light (via brake pedal position switch and brake light relay)* 2,

Keyless access/TPMS control unit (via brake pedal position switch)* 2,

MICU (via brake pedal position switch)* 2,

PCM (via brake pedal position switch)* 2,

Trailer electric brake connector (via brake pedal position switch)* 2,

Trailer lighting control unit (via brake light relay)* 2,

Trailer lighting control unit (via brake pedal position switch and brake light relay)* 2,

VSA modulator-control unit (via brake light relay)* 2,

VSA modulator-control unit (via brake pedal position switch and brake light relay)* 2

A7 10 A Tailgate latch synchronizer actuator relay (UNLOCK), Tailgate latch synchronizer actuator (via tailgate latch synchronizer actuator relay (UNLOCK))  
A8 7.5 A* 1 Radiator fan relay (via diode) *1: With AC power outlet
*2: Without AC power outlet
10 A* 2 Left headlight (low beam)
A9 7.5 A PCM  
A10 10 A Left headlight (low beam)* 1 *1: With AC power outlet
*2: Without AC power outlet
Right headlight (low beam)* 2
A11 10 A* 1 Right headlight (low beam) *1: With AC power outlet
*2: Without AC power outlet
7.5 A* 2 Radiator fan relay (via diode)
A12 15 A* 1 Ignition coil relay circuit (built into the relay circuit board),

Ignition coils (via Ignition coil relay circuit (built into the relay circuit board))

*1: With AC power outlet
*2: Without AC power outlet
20 A* 2 Injector relay, PCM (via injector relay)
A13 15 A* 1 PCM (via electronic throttle control system (ETCS) control relay circuit (built into the relay circuit board)) *1: With AC power outlet
*2: Without AC power outlet
20 A* 2 Headlight relay,

No. A8 and No. A10 fuses in the under-hood fuse/relay box (via headlight relay)

A14* 15 A AC inverter unit (via AC inverter ACC relay and AC power outlet switch),

AC inverter relay (via AC inverter ACC relay),

AC power outlet switch

*: With AC power outlet
A15 10 A* 1 Automatic lighting control unit-sensor* 3,

CAN gateway,

Data link connector,

Gauge control module,

HomeLink ® unit* 4,

Keyless access/TPMS control unit,

MICU,

Multipurpose camera unit,

Power mirror control unit* 5,

Power seat control unit* 5,

Power window master switch

*1: With AC power outlet
*2: Without AC power outlet
*3: Without automatic wiper
*4: With HomeLink ®
*5: With DPMS
*6: With front fog light
15 A* 2 Front fog light relay* 6,

Front fog lights (via front fog light relay)* 6

A16 15 A CKP sensor (via PGM-FI main relay 1 circuit (built into the relay circuit board))* 1, CMP sensor (via PGM-FI main relay 1 circuit (built into the relay circuit board))* 1, Electronic throttle control system (ETCS) control relay circuit (built into the relay circuit board) (via PGM-FI main relay 1 circuit (built into the relay circuit board))* 1, No. A11 fuse in the under-hood fuse/relay box (via PGM-FI main relay 1 circuit (built into the relay circuit board))* 1, PCM (via PGM-FI main relay 1 circuit (built into the relay circuit board))* 1, PGM-FI main relay 1 circuit (built into the relay circuit board)* 1, PGM-FI main relay 2 (via PGM-FI main relay 1 circuit (built into the relay circuit board))* 1 *1: With AC power outlet
*2: Without AC power outlet
MICU* 2
A17* 20 A Recline motor (via front passenger's power seat adjustment switch) *: With front passenger's power seat
A18* 20 A Slide motor (via front passenger's power seat adjustment switch) *: With front passenger's power seat
A19 15 A SBW shifter control module, TCM  
A20 7.5 A A/C compressor clutch (via A/C compressor clutch relay)  
A21 15 A MICU* 1 *1: With AC power outlet
*2: Without AC power outlet
CKP sensor (via PGM-FI main relay 1 circuit (built into the relay circuit board))* 2, CMP sensor (via PGM-FI main relay 1 circuit (built into the relay circuit board))* 2, Electronic throttle control system (ETCS) control relay circuit (built into the relay circuit board) (via PGM-FI main relay 1 circuit (built into the relay circuit board))* 2, No. A11 fuse in the under-hood fuse/relay box (via PGM-FI main relay 1 circuit (built into the relay circuit board))* 2, PCM (via PGM-FI main relay 1 circuit (built into the relay circuit board))* 2, PGM-FI main relay 1 circuit (built into the relay circuit board)* 2, PGM-FI main relay 2 (via PGM-FI main relay 1 circuit (built into the relay circuit board))* 2
A22 15 A Front A/F sensor (bank 2, sensor 1) (via PGM-FI subrelay circuit (built into the relay circuit board)), Front secondary HO2S (bank 2, sensor 2) (via PGM-FI subrelay circuit (built into the relay circuit board)), PGM-FI subrelay circuit (built into the relay circuit board), Rear A/F sensor (bank 1, sensor 1) (via PGM-FI subrelay circuit (built into the relay circuit board)), Rear secondary HO2S (bank 1, sensor 2) (via PGM-FI subrelay circuit (built into the relay circuit board))  
A23 20 A* 1 Injector relay, PCM (via injector relay) *1: With AC power outlet
*2: Without AC power outlet
15 A* 2 Ignition coil relay circuit (built into the relay circuit board),

Ignition coils (via Ignition coil relay circuit (built into the relay circuit board))

A24 20 A* 1 Headlight relay,

No. A8 and No. A10 fuses in the under-hood fuse/relay box (via headlight relay)

*1: With AC power outlet
*2: Without AC power outlet
15 A* 2 PCM (via electronic throttle control system (ETCS) control relay circuit (built into the relay circuit board))
A25 20 A No. A4 and No. A6 fuses in the under-hood fuse/relay box  
A26 15 A* 1 Front fog light relay* 6,

Front fog lights (via front fog light relay)* 6

*1: With AC power outlet
*2: Without AC power outlet
*3: Without automatic wiper
*4: With HomeLink ®
*5: With DPMS
*6: With front fog light
10 A* 2 Automatic lighting control unit-sensor* 3,

CAN gateway,

Data link connector,

Gauge control module,

HomeLink ® unit* 4,

Keyless access/TPMS control unit,

MICU,

Multipurpose camera unit,

Power mirror control unit* 5,

Power seat control unit* 5,

Power window master switch

A27* 10 A Heated steering wheel control unit (via heated steering wheel relay and cable reel) *: With heated steering wheel
A28 10 A Horn relay,

Horns (via horn relay)

 
A29 10 A PCM