Description

Acura TSX 2004 Electrical Schematic

You’ve got a 2004 Acura TSX on the lift with an electrical gremlin. You pull a connector, and half the pins look the same. Aftermarket diagrams? Good luck—those drawings are guessed, not measured. That’s why you need the factory Acura TSX 2004 Electrical Schematic—straight from Honda’s own engineering team. This is the 37-page document the dealer techs use when they’re stuck. Pair it with the Acura TSX 2004 Service Manual for complete repair workflows.

Acura TSX 2004 Electrical Schematic: What’s Inside

The manual is organized around three sections: Connectors and Harnesses, Connector Index, and Harness Location. On page 1 you get the assignment system—connectors prefixed with C, ground terminals with G, non-ground terminals with T. That alone kills the guesswork. The Connector Index table on page 2 maps every terminal to its exact location in the engine compartment, dashboard, floor, door, trunk, and roof. No vague descriptions—you get the actual cavity count and what it connects to.

Connector Index and Harness Location

Harness Location is broken down by zone: Engine Compartment, Dashboard, and Others covering floor, door, trunk, and roof. For example, the battery ground cable terminates at G1 (left side of engine compartment) with 6 cavities. The engine ground cables A and B use T1 and T2. The starter subharness is C101 and C151. You trace each harness branch—right front, left front, even the OPDS unit and side curtain airbag harnesses. This is the data you need to repair without cutting loops or backprobing blind.

Does This Manual Cover the Engine Compartment Wiring?

Yes. The engine compartment section details the engine wire harness, engine compartment wire harnesses (left and right branches), front engine compartment wire harness, and subharnesses like the transmission range switch. Connectors like C101 (6-cavity, left side) and C151 (1-cavity) are spelled out, along with the alternator (ref 1, 4 cavities) and knock sensor (ref 3). You also get ground terminals G101, G201, G202, G203, and G301–G302. That covers the entire bay from battery to throttle actuator control module subharness.

37 Pages of Connector Data

All 37 pages are packed with connector references—no filler. You’ll find indexes for the dashboard wire harness (left and right branches), floor harnesses (left and right sides), rear wire harness, roof wire harness, driver’s door and front passenger’s door harnesses, left/right rear door harnesses, seat wire harness, OPDS unit harness, A/C wire harness, and the cable reel subharness. Each entry lists the connector reference, number of cavities, location, and what it connects to. If you’re swapping a door harness or troubleshooting a window circuit, the data is right there.

Get the Right Ground Terminal Identification

Don’t trust aftermarket drawings that swap G and T designators. This manual uses G for body ground terminals (like G1 on the battery ground cable) and T for non-ground terminals (like T1 engine ground cable A). Mixing them up sends you chasing false grounds. The “Connector to Harness Index” table on page 2 shows exactly which harness each terminal belongs to. For instance, the alternator terminal is ref 1—4 cavities, middle of engine compartment, connects to engine wire harness. That’s the level of detail you need to avoid cutting the wrong wire.

For a broader understanding of Automotive Wiring, the Wikipedia article gives basics, but the factory schematic is what you need for actual diagnostics. The Automotive Industry Overview provides context, but it won’t tell you which pin on C151 is ignition power.

If you’re working on other models, the 2007 Acura RL Electrical Schematic – Factory Wiring & Relay Locations and 2005-2006 Acura RL Electrical Schematic – Factory OEM Wiring Diagrams use the same indexing logic.

What makes this different from a third-party wiring diagram?

OEM documents use factory-assigned connector IDs and exact cavity counts, not guesses.

How do I identify a specific connector in the engine bay?

Open the Connector Index on page 1. Find the component (e.g., alternator reference 1). The table shows 4 cavities, middle of engine compartment, connected to the engine wire harness. Then cross-reference that to the Harness Location section on page 2 to see the exact harness branch (right or left front). Finally, use the Connector to Harness Index to confirm the connector number (e.g., C101) and its pin assignment. This three-step process eliminates any doubt about which plug you’re dealing with.

Get the factory documentation. Access the Factory Manual now and stop chasing phantom shorts.