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Isuzu N-Series - fuse box diagram

avatar Jonathan Yarden Feb 11, 2021 · 5 min. read

In this article you will find a description of fuses and relays Isuzu, 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.

Year of production:

Passenger compartment fuse box (4HG1 engine model (type 1), 4JJ1/4HK1 engine models)

Isuzu N-Series - fuse box diagram - passenger compartment  (4HG1 engine model (type 1), 4JJ1/4HK1 engine models)

No.
Circuit Protected A
1 ELEC PTO (BATT) 20
2 RR P/WINDOW 20
3 ROOM LAMP, AUDIO 15
4 DOOR LOCK 15
5 FOG LAMP 10
6 P/WINDOW 20
7 ABS 10
8 WIPER 15
9 H/LAMP LO (LH) 10
10 ECU (BATT) 10
11 H/LAMP LO (RH) 10
12 STOP LAMP 10
13 IGNITION 2 15
14 H/LAMP HI (LH) 10
15 H/LAMP HI (RH) 10
16 ELEC PTO (KEY ST) 10
17 STARTER 10
18 IGNITION 1 15
19 SRS 10
20 ECM 10
21 METER 10
22 LAMPS (BATT) 10
23 AUDIO, ACC 15
24 MIRROR 15
25 HORN 15
26 TURN, HAZARD 15
27 TAIL LAMPS 10
28 ILLUMINATIONS 10
29 CORNERING LAMPS, RR FOG LAMP 10
30 BLOWER MOTOR 20
31 SPARE
32 SPARE
33 SPARE
Relay
1 STOP LAMP
2 BLOWER MOTOR
3 KEY ON
4 4HG1: BLANK
4JJ1, 4HK1: DOOR LOCK (LOCK)
5 4HG1: BLANK
4JJ1, 4HK1: REAR FOG LAMP
6 WIPER MAIN
7 HORN
8 WIPER (HIGH/LOW)
9 FOG LAMP
10 PTO MAIN
11 4HG1: BLANK
4JJ1, 4HK1: DOOR LOCK (UNLOCK)
12 POWER WINDOW
13 HEAD LAMP (LOW)
14 4JJ1, 4HK1, 4HG1: 4WD
15 HEAD LAMP (HIGH)
16 TAIL LAMP
17 4HG1: EXHAUST BRAKE CUT
4JJ1, 4HK1: PTO SOLENOID, M/T
18 4HG1: EXHAUST BRAKE
4JJ1, 4HK1: PTO CUT
19 4JJ1, 4HK1, 4HG1: TRANSFER IGNITION 1
4JJ1, 4HK1: CHARGE (ENGINE RUN)
20 4HG1: CHARGE (ENGINE RUN)
4JJ1, 4HK1: POWER WINDOW (REAR)
21 4HG1: PTO SOLENOID, M/T
22 4HG1: PTO CUT

Passenger compartment fuse box (4JB1-T engine model (type 1))

Isuzu N-Series - fuse box diagram - passenger compartment (4JB1-T engine model (type 1))

No.
Circuit Protected
A
1 RR P/WINDOW 25
2 FOG LAMPS 15
3 ROOM LAMP, AUDIO 10
4 DOOR LOCK 15
5 EXHAUST BRAKE 10
6 P/WINDOW 25
7 BACK UP LAMP 10
8 WIPER 25
9 H/LAMP LO (LH) 10
10 LAMPS (BATT) 10
11 H/LAMP LO (RH) 10
12 BRAKE LAMPS 10
13 STARTER 10
14 H/LAMP HI (LH) 10
15 H/LAMP HI (RH) 10
16 BLOWER (IG) 10
17 IGNITION 2 10
18 IGNITION 1 10
19 BLANK
20 ECM 10
21 METER 10
22 ECU (BATT) 10
23 MIRROR 10
24 ACCESSORIES, AUDIO 15
25 HORN 15
26 TURN, HAZARD 15
27 TAIL LAM PS 10
28 ILLUMINATIONS 10
29 CORNERING LAMPS 10
30 AIR CONDITIONER 10
31 CIGAR 20
32 SPARE
33 SPARE
34 SPARE
35 SPARE
Relay
1 STOP LAMP
2 FOG LAMP
3 KEY ON
4 BLANK
5 BLANK
6 WIPER MAIN
7 HORN
8 WIPER (HIGH/LOW)
9 EXHAUST BRAKE
10 RHD: BLANK
LHD: POWER WINDOW (REAR)
11 BLANK
12 POWER WINDOW
13 HEAD LAMP (LOW)
14 BLANK
15 HEAD LAMP (HIGH)
16 TAIL LAMP
17 CIGAR
18 BLANK
19 BLOWER MOTOR
20 CHARGE

Passenger compartment fuse box (4HG1 engine model (type 2), 4HG1-T engine models)

Isuzu N-Series - fuse box diagram - passenger compartment (type 2), 4HG1-T engine models)

No.
Circuit Protected
A
1 LAMPS BATT 10
2 EGR 10
3 ROOM LAMP AUDIO 15
4 DOOR LOCK 15
5 FOG LAMP 10
6 P/WINDOW 20
7 H/LAMP HI (LH) 10
8 H/LAMP HI (RH) 10
9 STOP LAMP 10
10 H/LAMP LO (LH) 10
11 H/LAMP LO (RH) 10
12 BLANK
13 TAIL LAMPS 10
14 CORNERING LAMPS 10
15 IGNITION 2 15
16 STARTER 10
17 IGNITION 1 15
18 METER 10
19 ACC AUDIO 15
20 BLANK
21 BLOWER 20
22 HORN 15
23 TURN HAZARD 15
24 WIPER 15
25 SPARE
26 SPARE
27 SPARE
Relay
1 TAIL LAMP
2 HEAD LAMP (HIGH)
3 HEAD LAMP (LOW)
4 CHARGE (ENGINE RUN)
5 STOP LAMP
6 BLOWER MOTOR
7 KEY ON
8 EXHAUST BRAKE
9 WIPER MAIN
10 WIPER (HIGH/LOW)
11 BLANK
12 HORN
13 A/C COMPRESSOR
14 POWER WINDOW
15 FOG LAMP

Passenger compartment fuse box (4JB1-TC engine model (type 2), 4JB1 engine models)

Isuzu N-Series - fuse box diagram - passenger compartment (4JB1-TC engine model (type 2), 4JB1 engine models)

No.
Circuit Protected
A
1 BLANK
2 ROOM LAMP AUDIO 10
3 EXH BRAKE 10
4 DOOR LOCK 15
5 FOG LAMP 15
6 P/WINDOW 25
7 H/LAMP HI (LH) 10
8 H/LAMP HI (RH) 10
9 STOP LAMP 10
10 H/LAMP LO (LH) 10
11 H/LAMP LO (RH) 10
12 TAIL LAM PS 10
13 LAMPS BATT 10
14 IGNITION 2 10
15 STARTER 10
16 ENGINE STOP 10
17 IGNITION 1 10
18 BACK UP LAMPS 10
19 METER 10
20 ACC AUDIO 15
21 AIR CON 10
22 HORN 15
23 TURN HAZARD 15
24 WIPER 25
25 SPARE
26 SPARE
27 SPARE
Relay
1 TAIL LAMP
2 HEAD LAMP (HIGH)
3 HEAD LAMP (LOW)
4 POWER WINDOW
5 STOP LAMP
6 CHARGE (ENGINE RUN)
7 KEY ON
8 EXHAUST BRAKE
9 WIPER MAIN
10 WIPER (HIGH/LOW)
11 FOG LAMP
12 HORN
13 BLANK
14 BLOWER MOTOR

Fuse and Relay Location (Cab Exterior)

Isuzu N-Series - fuse box diagram - fuse and relay location (cab exterior)

No.
Circuit Protected
A
1 MARKER LAMP
4HG1: Not used
10
1 4JB1-TC: FUEL HEATER 15
2 ECM MAIN
4JB1-TC, 4HG1: Not used
10
3 BATTERY 10
3 4JB1-TC: BATTERY 15
4 A/C
4JB1-TC: Not used
10
5 4HK11,2), 4JJ1: Not used
4JB1-TC: MARKER LAMP
4HG1: FUEL HEATER
20
6 4HK1, 4JJ1: Not used
4JB1-TC: A/C
4HG1: ENGINE STOP
15
Relay
1 STARTER
2 4HK1, 4JJ1: ECM
4JB1-TC, 4HG1: Not used
3 GLOW PLUG
4 A/C COMPRESSOR
5 CONDENSER FAN
6 4HK1, 4JJ1: STARTER CUTOFF
4JB1-TC: EXHAUST BRAKE
4HG1: ENGINE STOP
7 4HK11), 4JJ1: MARKER LAMP (MODEL WITH REAR FOG LAMP)
4HK12)EXHAUST BRAKE
4JB1-TC, 4HG1: FUEL HEATER
8 GEARSHIFTER
9 4WD (NPS MODEL)
10 FUEL HEATER (MODEL WITH FUEL HEATER)
11 TRANSFER GEAR CONTROL (NPS MODEL)
12 ENGINE RUN> (MODEL WITH FUEL HEATER)
13 4HK12):  MARKER LAMP (MODEL WITH REAR FOG LAMP)
1) 4HK1 engine model (Euro IV emission standards), 4JJ1 engine model
2) 4HK1 engine model (Euro II emission standards or Euro III emission standards)

Fuse and Relay Location (Cab Exterior; 4HG1-T, 4JB1, 4JB1-TC (type 2), 4HG1 (type 2))

Isuzu N-Series - fuse box diagram - fuse and relay location (Cab Exterior; 4HG1-T, 4JB1, 4JB1-TC (type 2), 4HG1 (type 2))

No.
Circuit Protected
A
1 4JB1-TC (type 2), 4JB1: POWER SOURCE 15
1 4HG1 (type 2), 4HG1-T: ENG STOP 10
2 4JB1-TC (type 2), 4JB1: FUEL HEATER 15
2 4HG1 (type 2), 4HG1-T: BAT SPARE 10
3 4JB1-TC (type 2), 4JB1: A/C 20
3 4HG1 (type 2), 4HG1-T: FUEL HEATER 10
4 4JB1-TC (type 2), 4JB1: CONDENSER FAN 20
4 4HG1 (type 2), 4HG1-T: A/C 10
Relay
1 GLOW
2 STARTER
3 4HG1 (type 2), 4HG1-T: CSD
4JB1-TC (type 2), 4JB1: Not Used
4 FUEL HEATER
5 CONDENSER FAN
6 EXT BRAKE
7 4HG1 (type 2), 4HG1-T: Not Used
4JB1-TC (type 2), 4JB1: 
CSD

WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.

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