Reminder Systems (Driver's MICU and Gauge Control Module) Input Test
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.
    • If the symptom is gone, the gauge control module is faulty; replace it.
    • If the symptom is still present, the driver's MICU is faulty; replace the driver's under-dash fuse/relay box.