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Auto-off Headlights Control Unit Input Test

WARNING: This page is about a different car, the 2008 Honda Pilot, 2007 Honda Pilot, and 2006 Honda Pilot. However, it is still accessible from the selected car via links, so may be relevant.
  1. Before testing the auto-off headlights functions, troubleshoot the multiplex control system (see TROUBLESHOOTING ).

    Driver's Multiplex Control Unit 

  2. Remove the driver's multiplex control unit from the driver's under-dash fuse/relay box.
  3. Inspect the connector and socket terminals to be sure they are all making good contact.
    • If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system.
    • If the terminals look OK, go to step  4.
      Fig 1: Inspecting Driver's Multiplex Control Unit
      G04247162Courtesy of AMERICAN HONDA MOTOR CO., INC.
  4. With the driver's multiplex control unit still disconnected, make these input tests at the connector or driver's under-dash fuse/relay box socket.
    • If any test indicates a problem, find and correct the cause, then recheck the system.
    • If all the input tests prove OK, go to step  5.
      DRIVER'S MULTIPLEX CONTROL UNIT(DISCONNECTED)

      Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained
      A24 Fuse/relay box socket Ignition switch ON (II) Check for voltage to ground:
      There should be battery voltage.
      • Blown No. 9 (10 A) fuse in the driver's under-dash fuse/relay box
      • Faulty driver's under-dash fuse/relay box
      A12 Fuse/relay box socket Under all conditions Check for voltage to ground:
      There should be battery voltage.
      • Blown No. 13 (7.5 A) fuse in the passenger's under-dash fuse/relay box
      • An open in the wire
  5. Reconnect the driver's multiplex control unit to the driver's under-dash fuse/relay box, and perform the following input tests at the appropriate connectors on the driver's under-dash fuse/relay box. For driver's under-dash fuse/relay box connector socket location (see DRIVER'S UNDER-DASH FUSE/RELAY BOX ).
    • If any test indicates a problem, find and correct the cause, then recheck the system.
    • If all the input tests prove OK, go to step  6.
      DRIVER'S MULTIPLEX CONTROL UNIT (RECONNECT)

      Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained
      E3 GRN/ORN Driver's door open Check for voltage to ground:
      There should be less than 1 V.
      • Faulty driver's door switch.
      • An open in the wire
      Driver's door closed Check for voltage to ground:
      There should be 5 V or more.
      • Faulty driver's door switch
      • A short to ground
      B16(1) RED/GRN Combination light switch ON Check for voltage to ground:
      There should be about 12 V.
      • Poor ground (G401)
      • Faulty combination light switch
      • An open in the wire
      B13(1) RED/WHT Passing switch ON Check for voltage to ground:
      There should be less than 1 V.
      • Poor ground (G401)
      • Faulty combination light switch
      • An open in the wire
      Passing switch OFF Check for voltage to ground:
      There should be 5 V or more.
      • Faulty combination light switch
      • A short ground
      L6 WHT/ORN Combination light switch ON Check for voltage to ground:
      There should be about 12 V.
      • Poor ground (G401)
      • Faulty combination light switch
      • Faulty headlight relay
      • An open in the wire
      L7 RED/YEL Combination light switch ON Check for voltage to ground:
      There should be less than 1 V.
      • Poor ground (G401)
      • Faulty combination light switch
      • An open in the wire
      M9 BLU/BLK Ignition key is in the ignition switch. Check for voltage to ground:
      There should be less than 1 V.
      • Poor ground (G401)
      • Faulty ignition switch
      • An open in the wire
      Ignition key is out of the ignition switch. Check for voltage to ground:
      There should be 5 V or more.
      • Faulty ignition switch
      • A short to ground
      (1) Multiplex control unit connector B

      Door Multiplex Control Unit 

  6. Remove the driver's door panel, and disconnect the connector A (20P) from the door multiplex control unit.
  7. Inspect the connector and socket terminals to be sure they are all making good contact.
    • If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system.
    • If the terminals look OK, go to step  8.
      Fig 2: Inspecting Door Multiplex control Unit Connector A
      G04247163Courtesy of AMERICAN HONDA MOTOR CO., INC.
  8. Reconnect the connector to the door multiplex control unit, and make this input test.
    • If the test indicates a problem, find and correct the cause, then recheck the system.
    • If the input test proves OK, the driver's or door multiplex control unit must be faulty; replace with a known-good unit and retest.
      DOOR MULTIPLEX CONTROL UNIT (RECONNECT)

      Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained
      A7 PNK Driver's door lock knob locked Check for voltage to ground:
      There should be less than 1 V.
      • Poor ground (G401)
      • Faulty driver's door lock actuator
      • An open in the wire
      Driver's door lock knob unlocked Check for voltage to ground:
      There should be 5 V or more.
      • Faulty driver's door lock actuator
      • Short to ground
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