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 MANUALSACURA19983.5RL SPECIAL EDITIONREPAIR AND DIAGNOSIS (SINGLE PAGE)EXTERNAL PAGESDIFFERENT CARSECTION 20 (MULTIPLEX CONTROL SYSTEM)SYSTEM TESTSDIAGNOSTIC TESTSTEST 3
1998 Acura 3.5RL Special Edition
Test 3
1998 Acura 3.5RL Special EditionSECTION Test 3
WARNING: This page is about a different car, the 1997 Acura 3.5RL. However, it is still accessible from the selected car via links, so may be relevant.
- Ensure ignition is off. Check continuity in communication line (Red/Yellow wire) between passenger's multiplex control unit Gray 26-pin connector terminal A9 and driver's multiplex control unit Gray 26-pin connector terminal B22. If continuity does not exist, check for open in Red/Yellow wire. If continuity exists, go to next step.
- Turn ignition on. Using a voltmeter, check communication line voltage at passenger's multiplex control unit Gray 26-pin connector terminal A9 (Red/Yellow wire). Voltage should read 4.8-6.0 volts. If voltage is as specified, replace passenger's multiplex control unit with a known-good unit and retest system. If system still does not operate properly, replace driver's multiplex control unit with a known-good unit and retest system. If voltage is not as specified, go to next step.
- If voltage is more than 6.0 volts, check for short in Red/Yellow wire and for poor connection or faulty circuit at receiver side unit. See WIRING DIAGRAMS. If voltage is less than 4.8 volts, check for short to ground and for poor connection or faulty circuit at transmitter side unit.
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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.