Entry Lights Control System (Driver's and Passenger's MICU, and Door Multiplex Control Unit) Input Test
Door Multiplex Control Unit
  1. Turn the ignition switch to LOCK (0), and remove the power window master switch.
  1. Disconnect the 37P connector from the door multiplex control unit.
  1. 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 15 .
  1. With the connector still disconnected, make these input tests at the connector.
    • 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 16 .
    Cavity
    Wire
    Test condition
    Test: Desired result
    Possible cause if desired result is not obtained
    32
    BLK
    Under all conditions
    Check for continuity to ground:
    There should be continuity.
    • Poor ground (G501)
    • An open in the wire
    37
    BLK
    Under all conditions
    Check for continuity to ground:
    There should be continuity.
    • Poor ground (G502)
    • An open in the wire
    13
    WHT
    Under all conditions
    Measure the voltage to ground:
    There should be battery voltage.
    • Blown No. 15 (10 A) fuse in the under-hood fuse/relay box
    • An open in the wire

  1. Reconnect the 37P connector to the door multiplex control unit, and make these input tests at the connector.
    • 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 17 .
    Cavity
    Wire
    Test condition
    Test: Desired result
    Possible cause if desired result is not obtained
    30
    YEL [GRN]
    Driver's door lock knob switch in LOCK
    Measure the voltage to ground:
    There should be less than 1 V.
    • Poor ground (G501)
    • Faulty driver's door lock knob switch
    • An open in the wire
    Driver's door lock knob switch in neutral or UNLOCK
    Measure the voltage to ground:
    There should be 5 V or more.
    • Faulty driver's door lock knob switch
    • A short to ground in the wire
    31
    WHT
    Driver's door lock knob switch in UNLOCK
    Measure the voltage to ground:
    There should be less than 1 V.
    • Poor ground (G501)
    • Faulty driver's door lock knob switch
    • An open in the wire
    Driver's door lock knob switch in neutral or LOCK
    Measure the voltage to ground:
    There should be 5 V or more.
    • Faulty driver's door lock knob switch
    • A short to ground in the wire

    [ ]:
    RHD model

  1. If multiple failures are found on more than one control unit, replace the driver's under-dash fuse/relay box (includes the driver's MICU). If input failures are related to a particular control unit, replace the control unit.