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.
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HOMESERVICE MANUALSACURA20043.5RLREPAIR AND DIAGNOSISBODY & FRAMEPOWER WINDOWSSYSTEM TESTSMULTIPLEX CONTROL UNIT3.2TL
2004 Acura 3.5RL
Multiplex Control Unit: 3.2TL
2004 Acura 3.5RLSECTION 3.2TL
- Remove driver's underdash fuse/relay box. See DRIVER'S UNDERDASH FUSE/RELAY BOX (3.2TL) under REMOVAL & INSTALLATION. Remove driver's multiplex control unit from driver's underdash fuse/relay box. Inspect connectors and terminals. Check for bent, loose, or corroded terminals. Repair as necessary and recheck system operation. If connectors and terminals are okay, perform driver's multiplex control unit input tests. See Fig 1 and Fig 2 . If input tests are okay, go to next step.
- Remove passenger's underdash fuse/relay box. See PASSENGER'S UNDERDASH FUSE/RELAY BOX (3.2TL) under REMOVAL & INSTALLATION. Remove passenger's multiplex control unit from passenger's underdash fuse/relay box. Inspect connectors and terminals. Check for bent, loose, or corroded terminals. Repair as necessary and recheck system operation. If connectors and terminals are okay, perform passenger's multiplex control unit input tests. See Fig 3 . If input tests are okay, go to next step.
- Remove driver's door panel. See DOOR PANEL under REMOVAL & INSTALLATION. Remove power window master switch/driver's door multiplex control unit. Driver's door multiplex control unit is built into power window master switch. Go to next step.
- Disconnect driver's door multiplex control unit 20-pin connector. Inspect connectors and terminals. Check for bent, loose, or corroded terminals. Repair as necessary and recheck system operation. If connectors and terminals are okay, perform driver's door multiplex control unit input tests. See Fig 4 . If input tests are okay, go to next step.
- If all input tests are okay, one of the control units may be intermittently at fault. Substitute a known-good control unit for the one most likely at fault and recheck system. If system works properly, replace original control unit. If a malfunction still exists, substitute a known-good control unit for the next most likely to be at fault. Recheck system operation. If system works properly, replace original control unit. If a malfunction still exists, substitute a known-good control unit for the next most likely to be at fault. Recheck system operation.
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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.