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Home >> Honda >> 1997 >> Prelude Base, Automatic >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> System Tests >> Dash Lights Brightness Controller Input Test >> Passenger's Side MCU

Passenger's Side MCU

  1. Remove right kick panel. Remove passenger's side Multiplex Control Unit (MCU). Disconnect 14-pin and 20-pin connectors. Inspect connector terminal connection for bent, damaged or corroded terminals. Repair as necessary. If connections are okay, go to next step.
  2. Using a DVOM, check resistance between connector terminals D8 (White/Red wire) and D9 (Red/White wire) of passenger side MCU harness connector, while rotating dimmer adjustment. See Figure . Reading should range between 0-12 k/ohms. If reading is as specified, go to next step. If reading does not indicate battery voltage, faulty dash lights brightness controller, or an open in wiring.
  3. Connect passenger side MCU connector terminal E10 (Red wire) to ground, with combination light switch in ON position. Dash lights should illuminate to maximum brightness. If dash lights do no illuminate, repair open in Red wire. If dash lights illuminate, go to neat step.
  4. Check continuity to ground at terminal E20. Continuity to ground should exist at all times. If continuity to ground does not exist, check for an open in Black wire, or a poor connection at harness grounds G401 and G402. Repair as necessary.
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