Reminder Systems (Driver's MICU and Gauge Control Module) Input Test
NOTE: Before testing, do the gauge control module self-diagnostic function to make sure the beeper and the indicators in the gauge control module work properly and the B-CAN and F-CAN lines are OK.
Driver's MICU
  1. Turn the ignition switch to LOCK (0).
  1. Remove the driver's dashboard undercover, then remove the dashboard lower cover.
  1. Disconnect driver's under-dash fuse/relay box connectors D, Q, and R.
    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. With the connectors still disconnected, make these input tests at the connectors.
    • 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 desired result is not obtained
    Q1
    BLK
    Under all conditions
    Check for continuity to ground: There should be continuity.
    • Poor ground (G501)
    • An open in the wire
    Q2
    BRN
    Under all conditions
    Check for continuity to ground: There should be continuity.
    • Poor ground (G501)
    • An open in the wire
    R2
    BRN
    Under all conditions
    Check for continuity to ground: There should be continuity.
    • Poor ground (G501)
    • An open in the wire
    R5
    BLK
    Under all conditions
    Check for continuity to ground: There should be continuity.
    • Poor ground (G502)
    • An open in the wire

  1. Reconnect the connectors to the driver's under-dash fuse/relay box, and make these input tests at the connectors.
    • 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 7 .
    Cavity
    Wire
    Test condition
    Test: Desired result
    Possible cause if desired result is not obtained
    D12
    BRN
    Driver's door open
    Measure the voltage to ground: There should be less than 1 V.
    • Faulty driver's door switch
    • An open in the wire
    Driver's door closed
    Measure the voltage to ground: There should be 5 V or more.
    • Faulty driver's door switch
    • A short to ground in the wire
    Q18
    WHT
    Ignition key inserted into the ignition switch
    Measure the voltage to ground: There should be less than 1 V.
    • Poor ground (G503)
    • Faulty ignition key switch
    • An open in the wire
    Ignition switch in LOCK (0) position and ignition key removed from the ignition switch
    Measure the voltage to ground: There should be 5 V or more.
    • Faulty ignition key switch
    • A short to ground in the wire
    R6·R3
    RED·BLK
    Combination light switch OFF
    Measure the voltage between R6 and R3 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
    Measure the voltage between R6 and R3 terminals: There should be 5 V or more.
    • Faulty combination light switch
    • A short to ground in the wire
    R7·R3
    GRY·BLK
    Combination light switch (SMALL position) ON
    Measure the voltage between R7 and R3 terminals: There should be less than 1 V.
    • Faulty combination light switch
    • An open in the wire
    Combination light switch OFF
    Measure the voltage between R7 and R3 terminals: There should be 5 V or more.
    • Faulty combination light switch
    • A short to ground in the wire
    R8·R3
    BRN·BLK
    Combination light switch (Headlight position) ON
    Measure the voltage between R8 and R3 terminals: There should be less than 1 V.
    • Faulty combination light switch
    • An open in the wire
    Combination light switch OFF
    Measure the voltage between R8 and R3 terminals: There should be 5 V or more.
    • Faulty combination light switch
    • A short to ground in the wire