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Gauge Control Module Input Test

NOTE: Before testing, do the gauge control module self-diagnostic function (see SELF-DIAGNOSTIC FUNCTION  ), and make sure the B-CAN communication lines are OK.
  1. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
  2. Remove the gauge control module (see GAUGE CONTROL MODULE REPLACEMENT  ), and disconnect connector A (32P) and B (20P) from it.
    Fig 1: Identifying Gauge Control Module Connector A (32P) And B (20P)
    G08086937Courtesy of AMERICAN HONDA MOTOR CO., INC.
  3. 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 4.
  4. With the connector still disconnected, do the following input tests.
    • 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 5.
    Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
    A12 WHT Battery sensor 2P connector disconnected Check for continuity between A12 and battery sensor 2P connector terminal No. 1: There should be continuity. An open in the UART wire
    Check for continuity to ground: There should be no continuity. A short to ground in the UART wire
    A21 RED Combination light switch ON Connect to ground with a jumper wire: Dashlights should come on full bright.
    • Faulty LEDs
    • Faulty bulbs
    • An open or high resistance in the wire
    A31 GRIM Ignition switch ON (II), or power mode ON, turn signal switch in RIGHT Measure the voltage to ground: There should be battery voltage when the lights are flashing.
    • Faulty driver's MICU
    • Faulty combination light switch
    • An open or high resistance in the wire
    A32 BLU Ignition switch ON (II), or power mode ON, turn signal switch in LEFT Measure the voltage to ground: There should be battery voltage when the lights are flashing.
    • Faulty driver's MICU
    • Faulty combination light switch
    • An open or high resistance in the wire
  5. Reconnect connector A (32P) to the gauge control module, and do the following input tests:
    • If any test indicates a problem, find and correct the cause, then recheck the system.
    • If all the input tests prove OK, the gauge control module must be faulty; replace it (see GAUGE CONTROL MODULE REPLACEMENT  ).
    Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
    A16 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 or high resistance in the wire
    A15 BRN Ignition switch ON (II), or power mode ON Measure the voltage to ground: There should be battery voltage.
    • Blown No. 12 (7.5 A) fuse in the driver's under-dash fuse/relay box
    • An open or high resistance in the wire
    A1 GRY In all ignition switch positions or all power modes Measure the voltage to ground: There should be less than 0.2 V.
    • Poor ground (G402)
    • An open or high resistance in the ground wire
    A17 BLK In all ignition switch positions or all power modes Measure the voltage to ground: There should be less than 0.2 V.
    • Poor ground (G401)
    • An open or high resistance in the ground wire
    A6 GRN Ignition switch ON (II), or power mode ON, brake fluid level is full in the reservoir Measure the voltage to ground: There should be battery voltage.
    • Faulty brake fluid level switch
    • A short to ground in the wire
    Ignition switch ON (II), or power mode ON, brake fluid level is low in the reservoir Measure the voltage to ground: There should be less than 0.2 V.
    • Faulty brake fluid level switch
    • Poor ground (G303) or an open in the ground wire
    • An open or high resistance in the wire
    A7 LT GRN Ignition switch ON (II), or power mode ON, parking brake lever pulled Measure the voltage to ground: There should be less than 0.2 V.
    • Faulty parking brake switch
    • Faulty parking brake switch ground
    • An open or high resistance in the wire
    Ignition switch ON (II), or power mode ON, parking brake lever released Measure the voltage to ground: There should be battery voltage.
    • Faulty parking brake switch
    • A short to ground in the wire
    A27 BLU Ignition switch ON (II), or power mode ON, washer fluid level is full in the washer reservoir Measure the voltage to ground: There should be about 5 V.
    • Faulty washer fluid level switch
    • A short to ground in the wire
    Ignition switch ON (II), or power mode ON washer fluid level is low in the washer reservoir Measure the voltage to ground: There should be less than 0.2 V.
    • Faulty washer fluid level switch
    • Poor ground (G201) or an open in the ground wire
    • An open or high resistance in the wire
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