Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1996 Acura 3.5RLFACTORY OEM SERVICE PROCEDURE
Door Multiplex Control Unit
- Remove driver's door trim panel enough to gain access to door multiplex control unit connector. See DOOR TRIM PANEL under REMOVAL & INSTALLATION. Turn ignition off. Disconnect door multiplex control unit Blue 20-pin connector. See Fig 1 . Ensure connector terminals are okay and making proper contact. Repair connector terminals as necessary and retest system. If connector terminals are okay, go to next step.
- Using a voltmeter, probe between door multiplex control unit Blue 20-pin connector terminal No. 1 (White/Yellow wire) and ground. See Fig 1 . See DOOR MULTIPLEX CONTROL UNIT CONNECTOR TERMINAL IDENTIFICATION table. If battery voltage exists, go to next step. If battery voltage does not exist, check fuse No. 56 (7.5-amp), located in fuse/relay box, under instrument panel. If fuse is okay, check for open in White/Yellow wire.
- Turn ignition on. Using a voltmeter, probe between door multiplex control unit Blue 20-pin connector terminal No. 2 (Green/White wire) and ground. If battery voltage exists, go to next step. If battery voltage does not exist, check fuse No. 17 (20-amp), located in fuse/relay box, under instrument panel. If fuse is okay, check for open in Green/White wire.
- Turn ignition off. Using an ohmmeter, probe between door multiplex control unit Blue 20-pin connector terminals No. 12 (Black wire) and No. 19 (Black wire) and ground. If continuity does not exist, check for an open in Black wire and/or bad ground connection. If wires and ground connections are okay, replace power window master switch.
DOOR MULTIPLEX CONTROL UNIT CONNECTOR TERMINAL ID
| Terminal (Wire Color) (1) | Circuit | ||
|---|---|---|---|
| 1 (WHT/YEL) | Battery Voltage Input | ||
| 2 (GRN/WHT) | Power Window Relay Input | ||
| 3 (RED/BLK) | Master Switch Light - Power | ||
| 4 (BLU) | Window Motor Pulse Input | ||
| 5 (GRN/BLU) | Door Switch Input | ||
| 6 (GRN/WHT) | Key Cylinder Switch UNLOCK | ||
| 7 (BLU/WHT) | Knob Switch LOCK | ||
| 8 (GRN/RED) | Lock Switch UNLOCK | ||
| 10 (RED/BLU) | Window Motor Control | ||
| 11 (RED/YEL) | Window Motor Control | ||
| 12 (BLK) | Ground | ||
| 13 (RED) | Master Switch Light GROUND | ||
| 14 (BLU/BLK) | Trunk Opener Switch Input | ||
| 15 (BRN/YEL) | Door "D" Line | ||
| 16 (GRN/RED) | Key Cylinder Switch LOCK | ||
| 17 (GRN/BLK) | Knob Switch UNLOCK | ||
| 18 (GRN/WHT) | Lock Switch LOCK | ||
| 19 (BLK) | Ground | ||
| 20 (GRY/BLK) | Main Switch Output | ||
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Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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