Jonathan Yarden Oct 22, 2021 · 5 min. read
In this article you will find a description of fuses and relays Komatsu,
with photos of block diagrams and their locations.
Highlighted the cigarette lighter fuse (as the most popular thing people look for).
Get tips on blown fuses, replacing a fuse, and more.
Fuse box
Numbers |
Ampers |
Protected Circuit |
F1 |
15 |
Central front work lights |
F2 |
15 |
Central rear work lights |
F3 |
3 |
Front left and rear right parking light, parking light warning light, instrument backlighting |
F4 |
3 |
Front right and rear left parking light, cigarette lighter light |
F5 |
10 |
Front hom |
F6 |
15 |
Lateral rear work lights |
F7 |
7,5 |
Rear windshield wiper, rear hom |
F8 |
7,5 |
Stop lights, stop light relay |
F9 |
15 |
Lateral front work lights |
F10 |
10 |
Front windshield wiper, windshield washer pump |
F11 |
7,5 |
Boom locking solenoid valve, plate locking solenoid valve |
F12 |
5 |
Buzzer power supply, general alarm power supply, instrument and front dashboard warning light power supply |
F13 |
10 |
Optional equipment power supply, 4WD solenoid valve. |
F14 |
10 |
High beam relay, low beam relay, horn relay, safety valve solenoid valves |
F15 |
10 |
Engine stop solenoid, ancillary functions relay, air conditioner relay |
F16 |
10 |
Revolving light power supply |
F17 |
10 |
Hour counter memory, hazard warning light |
F18 |
10 |
Cigarette lighter power supply, overhead light |
F19 |
15 |
Left low beam, right low beam |
F20 |
15 |
Left high beam, right high beam |
F21 |
10 |
Return-to-dig sensor power supply, LSS solenoid valve, loader arm floating device solenoid valve, retum-to-dig solenoid valve, direction indicator |
F22 |
7,5 |
Servo control locking solenoid valve, EC power solenoid valve, PPC power supply |
F23 |
10 |
Steering unit |
F24 |
7,5 |
Direction indicator power supply |
F25 |
10 |
Declutch relay, forward gear solenoid valve, reverse gear solenoid valve, reverse alarm |
Relay |
K1 |
Safety unit (against repeated start) |
K2 |
Blinking |
K3 |
Low beam relay |
K4 |
High beam relay |
K5 |
Front hom relay |
K6 |
Retum-to-dig relay |
K7 |
Stop light relay |
K8 |
Start enabling relay |
K9 |
Forward gear relay |
K10 |
Reverse relay |
K11 |
Direction indicator power supply relay (declutch) |
Numbers |
Ampers |
Protected Circuit |
F27 |
175 |
General system fuse, ignition key, start relay, pre-heating consent, heating power supply |
Numbers |
Protected Circuit |
K12 |
Machine functions relay |
K13 |
Start relay |
Numbers |
Protected Circuit |
K14 |
Glow plug preheating relay |
K15 |
Multifunction unit |
Numbers |
Ampers |
Protected Circuit |
1 |
20 |
1st and 2nd fan speed power supply |
2 |
40 |
rd fan speed power supply |
3 |
7,5 |
Air conditioning compressor |
Numbers |
Protected Circuit |
4 |
rd fan speed relay |
5 |
General heating relay |
6 |
Air conditioning compressor relay |
WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.
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