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. 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

Gauge Control Module
  1. Turn the ignition switch to LOCK (0).
  1. Remove the gauge control module, and disconnect the 32P connector from it.
  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 10 .
  1. Reconnect the connector to the gauge control module, and make these input tests at all connector.
    • If any test indicates a problem, find and correct the cause, then recheck the system.
    • If the input tests prove OK, go to Step 11 .
    Cavity
    Wire
    Test condition
    Test: Desired result
    Possible cause if desired result is not obtained
    17
    BRN
    Under all conditions
    Check for continuity to ground: There should be continuity.
    • Poor ground (G501)
    • An open in the wire
    16
    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
    • Faulty driver's under-dash fuse/relay box
    • An open in the wire
    15
    BRN
    Ignition switch ON (II)
    Measure the voltage to ground: There should be battery voltage.
    • Blown No. 5 (7.5 A) fuse in the driver's under-dash fuse/relay box
    • Faulty driver's under-dash fuse/relay box
    • An open in the wire
    31
    LT GRN
    Parking brake switch ON (Lever pulled)
    Check for continuity to ground: There should be continuity.
    • Faulty parking brake switch
    • An open in the wire
    Parking brake switch OFF (Lever released)
    Check for continuity to ground: There should be no continuity.
    • Faulty parking brake switch
    • A short to ground in the wire

  1. If the lights-on reminder has a problem, substitute a known-good driver's under-dash fuse/relay box, and recheck the system. If the seat belt reminder has a problem, check for SRS DTCs and check the seat belt buckle switches. If all the tests prove OK, go to Step 12 .
  1. Substitute a known-good gauge control module, and recheck the system.