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)
| 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))
| 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)
| 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)
| 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)
| 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))
| 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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