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Driver's Side MCU

  1. Remove underdash fuse/relay box. Remove driver's side Multiplex Control Unit (MCU). See Figure . 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 MCU connector terminal A2 of underdash fuse/relay box cavity. See Figure . With combination light switch on, reading should indicate battery voltage. If reading is as specified, go to next step. If reading does not indicate battery voltage, check No. 10 (15-amp) fuse of underdash fuse/relay box, faulty combination switch or open in wiring.
  3. Check MCU connector terminal A7 for continuity to ground. Continuity should exist at all times. If continuity to ground does not exist, check for an open in wiring or a poor connection at harness grounds G401 and G402. Repair as necessary.
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