Isuzu Trooper UBS26 / UBS69 Fuse and Relay Diagram

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Relay and Fuse Box Location

• Interior Fuse Box: Located at the bottom of the dashboard on the driver's side (behind the protective cover). Controls the interior lighting, instruments, audio system, and power windows.
• Engine Bay Fuse Box: Located on the right side of the engine compartment (near the battery). This fuse box contains the power fuses and main relays (starter, fuel pump, glow plugs, ABS).

1 - Relay and Fuse Box

2 - Fuse Box

(1) Relay & Fuse Box

(2) Lighting Relay

(3) Not Used

(4) Not Used

(5) Not Used

(6) Thermo Relay

(7) Not Used

(8) Compressor Relay

(9) Horn Relay

(10) Tail Relay

(11) Not Used

(12) Fuel Pump Relay

(13) PCM Main Relay

(14) Not Used

(15) Not Used

(16) Diode

(17) Upshift Relay–1

(18) Starter Relay

(19) Not Used

(20) Not Used

(21) Not Used

(22) Not Used

(23) Cornering Relay

(24) Fog Light Relay

(25) Fusible Link (Main)

(26) Fusible Link (Key SW)

(27) Fusible Link (ECM)

(28) Fusible Link (Condenser Fan)

(29) Not Used

(30) Fusible Link (ABS)

(31) Fuse F–1 (Not Used)

(32) Fuse F–2 (20A)

(33) Fuse F–3 (15A)

(34) Fuse F–4 (15A)

(35) Fuse F–5 (15A)

(36) Fuse F–6 (10A)

(37) Fuse F–7 (Not Used)

(38) Fuse F–8 (15A)

(39) Fuse F–9 (20A)

(40) Fuse F–10 (15A)

(41) Fuse F–11 (Not Used)

(42) Fuse F–12 (15A)

(43) Upshift Resistor

(1) Fuse Box

(2) Fuse C–21 (10A)

(3) Flasher Unit

(4) H–49

(5) Rear Defogger Relay

(6) Power Window Relay

(7) Heater & A/C Relay

(8) Diode (Not Used)

(9) Diode (Not Used)

(10) Circuit Breaker C/B–2

(11) Circuit Breaker C/B–1 (Not Used)

(12) Diode (Not Used)

(13) Fuse C–1 (10A)

(14) Fuse C–2 (15A)

(15) Fuse C–3 (15A)

(16) Fuse C–4 (15A)

(17) Fuse C–5 (15A)

(18) Fuse C–6 (10A)

(19) Fuse C–7 (Not Used)

(20) Fuse C–8 (15A)

(21) Fuse C–9 (15A)

(22) Fuse C–10 (10A)

(23) Fuse C–11 (10A)

(24) Fuse C–12 (20A)

(25) Fuse C–13 (10A)

(26) Fuse C–14 (15A)

(27) Fuse C–15 (20A)

(28) Fuse C–16 (10A)

(29) Fuse C–17 (25A)

(30) Fuse C–18 (20A)

(31) Fuse C–19 (25A)

(32) Fuse C–20 (10A)

(33) Diode (Not Used)

(34) Diode (Not Used)

(35) Diode (Not Used)

(36) Diode (Lighting)

Common electrical problems with the Isuzu Trooper 1998–2003

• 4WD problem: A flashing 4WD indicator is often caused by oxidized relay contacts or wiring on the front axle actuator.
• Instrument cluster "freezing": Lazy gauges often require checking the METER fuse or soldering the instrument panel circuit board.
• Lighting system: Burned contacts in the steering column switch (guitar), causing headlight failure. Installation of additional load-shedding relays is recommended.