Description

Daewoo M-150, BL2 Service Manual – 21 Pages of Factory Wiring

If you’ve ever chased a short in a bus electrical system using aftermarket wiring diagrams that show wrong wire colors or missing connectors, you know the feeling. This 21-page Daewoo M-150, BL2 Service Manual is the real OEM print—the same one Daewoo dealership techs used. It covers Section 9A: Body Wiring System. I’ve pulled apart enough burned harnesses to tell you: factory wiring documentation saves your diagnostic time. This isn’t a reprint of a reprint. It’s the original PDF from the manufacturer, scanned with all pages intact.

Electrical Routing Diagrams: Where the Wires Actually Go

The manual starts with a serious caution: disconnect the negative battery cable before any electrical work. That’s on page 9A-1. Then it dives straight into “How to Read Electrical Wiring Diagram” (page 9A-2). If you don’t understand the logic behind the power supply lines—30, 15, 15A, Ka, 58, 50—you’ll misdiagnose. The manual explains each symbol, fuse number format (Ef10 or F3), and connector numbering. For example, connector C202 terminal 10 means something specific. You need the manual to decode it. Aftermarket PDFs skip that detail.

7 Wiring Systems Covered

Here’s what’s inside: Fuse Chart (page 9A-10), Power Distribution Schematic (page 9A-7), Relay & Fuse Box Locator for engine room and passenger compartment (pages 9A-8 and 9A-9). Then the harness routings—Front, Engine, Instrument, Airbag, Body, Front Door, Rear Door, Tailgate. That’s eight separate harness routings, each with specific wire colors from the chart on page 9A-6. If you’re installing a aftermarket accessory or repairing collision damage, you need to know which harness carries airbag circuits. The Airbag Harness Routing section (page 9A-16) shows exactly that.

Does This Manual Cover the Engine Harness?

Yes—Engine Harness Routing is on page 9A-12. But this is primarily a body wiring system document. For engine mechanical specs like torque values or valve adjustments, you’ll want the companion Daewoo M-150 BL2 Service Manual that covers the powerplant. The manual you’re looking at now is strictly electrical. It includes the Special Tools Table (page 9A-5) listing the required diagnostic equipment—things like terminal test adapters and harness bridge tools. Don’t start poking at connectors without those. I’ve seen too many bent pins.

Torque Specs? Not Here—But That’s Not the Point

This isn’t an engine overhaul manual. It’s the wiring bible for the M-150 and BL2 bus platforms. If you need torque specs for suspension or driveline, look at Daewoo M-150 Service Manual – Power Steering Pump Section 6B or the Daewoo Musso Service Manual – Factory OEM Specs for 1465-Page Workbench. What this manual gives you is exact factory wire colors, fuse ratings, and connector terminal checks. For example, the stoplamp circuit: hot at all times through a 40A Ef2 fuse, RED wire to C205, then to stoplamp switch, YEL to left and right stoplamps, grounds at G401 and G402. That’s straight off page 9A-2 diagram. You can trace it with a multimeter in minutes.

Source Authenticity: OEM vs. Aftermarket Wiring Diagrams

I’ve been wrenching 28 years. Aftermarket wiring books are dangerous. They consolidate years of models, leave out connector views, and guess on wire colors. This Service Manual is the OEM Daewoo document—same as what the factory training center uses. The Wire Color Chart (page 9A-6) is specific to the M-150 and BL2. The fuse box locator photos? Factory shots, not drawn in Illustrator. That matters when you’re in a dark bus bay at 10 PM and need to know which relay position is for the tailgate harness. The manual includes the exact page numbers (9A-8 and 9A-9) for relay and fuse locations in engine room and passenger compartment. No guesswork.

How to Use This Manual on the Bench

Print the whole 21 pages, laminate the wiring diagram, and keep it in your toolbox. Start with the “How to Check Terminal Number of Connector” procedure (page 9A-4). Then use the Power Distribution Schematic (page 9A-7) to identify which circuit feeds which component. If you’re replacing a body harness, follow the routing diagrams from page 9A-11 through 9A-21. Each harness section shows the exact path through the bus body. I recommend you reference the Internal Combustion Engine fundamentals and Manual Transmission theory if you’re a newer tech, but for electrical diagnostics, this manual alone will take you through 90% of body electrical faults.

Is this manual only for the BL2 model?

The manual covers both M-150 and BL2. The wiring diagrams apply to both chassis variants.

Does it include engine control module (ECM) pinouts?

No. This is body wiring only. ECM pinouts are in the engine control section (separate manual). You get connectors for body systems—lights, airbag, instrument cluster, power windows, door locks, tailgate.

What page shows the fuse box locations?

Engine room fuse box on page 9A-8, passenger compartment on page 9A-9. Both include component locator maps.

Can I use this for a 2002 Daewoo bus?

The manual is for the M-150 and BL2 series. If your bus uses a different platform, the harness routing and fuse assignments will differ. Check the publication year—if it matches your bus’s production range, it’s correct. The 21 pages don’t include model years; verify against your VIN.

Access the Factory Manual. I don’t sell guesswork. AutoRepairManuals is the largest collection of OEM shop manuals in North America with verified factory specifications. This Daewoo M-150, BL2 Service Manual gives you the same print the dealer techs used. 21 pages, full-body wiring, original factory scans. You will not find a clearer set of bus electrical diagrams anywhere. Get it now.