Reminder System Control Unit (MICU, Gauge Control Module) Input Test
NOTE: Before testing, make sure there is no F-CAN DTC.
MICU
  1. Turn the ignition switch OFF.
  1. Remove the under-dash fuse/relay box.
  1. Disconnect the under-dash fuse/relay box connectors E, R, S, and T.
    NOTE: All connector views are wire side of female terminals.
  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 are OK, go to Step 5 .
  1. Reconnect the connectors, then 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 6 .
    Cavity
    Wire
    Test condition
    Test: Desired result
    Possible cause if result is not obtained
    E37
    GRN
    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 in the wire
    R6
    PNK
    Ignition key inserted into the ignition switch
    Check for voltage to ground: There should be less than 1 V.
    • Poor ground (G403)
    • Faulty ignition key switch
    • An open in the wire
    Ignition switch OFF and ignition key removed from the ignition switch
    Check for voltage to ground: There should be 5 V or more.
    • Faulty ignition key switch
    • A short to ground in the wire
    S1·S5
    RED
    Combination light switch OFF
    Check for voltage between S1 and S5 terminals: There should be less than 1 V.
    • Faulty combination light switch
    • An open in the wire
    Combination light switch in any other position than OFF
    Check for voltage between S1 and S5 terminals: There should be 5 V or more.
    • Faulty combination light switch
    • A short to ground in the wire
    S11·S5
    BRN
    Combination light switch (Headlight position) ON
    Check for voltage between S11 and S5 terminals: There should be less than 1 V.
    • Faulty combination light switch
    • An open in the wire
    Combination light switch OFF
    Check for voltage between S11 and S5 terminals: There should be 5 V or more.
    • Faulty combination light switch
    • A short to ground in the wire
    S13·S5
    GRY
    Combination light switch (SMALL position) ON
    Check for voltage between S13 and S5 terminals: There should be less than 1 V.
    • Faulty combination light switch
    • An open in the wire
    Combination light switch OFF
    Check for voltage between S13 and S5 terminals: There should be 5 V or more.
    • Faulty combination light switch
    • A short to ground in the wire
    T11
    ORN
    passenger's walk-in lever pulled up and hold
    Check for voltage to ground: There should be less than 1 V.
    • Faulty passenger's walk-in switch
    • An open in the wire
    passenger's walk-in lever released
    Check for voltage to ground: There should be 5 V or more.
    • Faulty passenger's walk-in switch
    • A short to ground in the wire
    T12
    GRN
    Driver's walk-in lever pulled up and hold
    Check for voltage to ground: There should be less than 1 V.
    • Faulty driver's walk-in switch
    • An open in the wire
    Driver's walk-in lever released
    Check for voltage to ground: There should be 5 V or more.
    • Faulty driver's walk-in switch
    • A short to ground in the wire