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Gauge Control Module Input Test

WARNING: This page is about a different car, the 2013 Acura MDX, 2012 Acura MDX, 2011 Acura MDX, and 2010 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Before testing the gauge control module, troubleshoot the multiplex integrated control unit first, using B-CAN System Diagnosis Test Mode A TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).
  1. Turn the ignition switch to LOCK (0) and remove the gauge control module 
  2. Disconnect gauge control module connectors A (12P) and B (24P).
    NOTE: All connector views are wire side of female terminals.
    Fig 1: Identifying Gauge Control Module Connector A (12P) Terminals
    G08055498Courtesy of AMERICAN HONDA MOTOR CO., INC.
    Fig 2: Identifying Gauge Control Module Connector B (24P) Terminals
    G08055499Courtesy 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 look OK, go to step 4.
  4. With the connectors 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
    A5 LT GRN Under-dash fuse/relay box connector N (45P) disconnected Check for continuity between A5 and under-dash fuse/relay box connector N (45P) terminal No. 22:
    There should be continuity.    		 An open or high resistance in the wire
    A6 RED PCM connector A (49P) disconnect Check for continuity between A6 and PCM connector A (49P) terminal No. 49:
    There should be continuity.    		 An open or high resistance in the wire
    A12 WHT PCM connector A (49P) disconnected Check for continuity between A12 and PCM connector A (49P) terminal No. 48:
    There should be continuity.    		 An open or high resistance in the wire
    B7 PNK Battery sensor 2P connector disconnected Check for continuity between B7 and battery sensor 2P connector terminal No. 1:
    There should be continuity.    		 An open or high resistance in the wire
  5. Reconnect the connectors, turn the ignition switch to ON (II), 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, replace the gauge control module.
    Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
    A2 BLK In all ignition switch positions Measure the voltage to ground:
    There should be less than 0.2 V.
    • Poor ground (G501) or an open in the ground wire
    • An open or high resistance in the wire
    B13
    A1 WHT Under all conditions Measure the voltage to ground:
    There should be battery voltage.
    • Blown No. 4 (40 A) fuse in the main under-hood fuse box
    • Blown No. 7 (10 A) fuse in the under-dash fuse/relay box
    • Faulty main under-hood fuse box
    • Faulty under-dash fuse/relay box
    • An open or high resistance in the wire
    A7 YEL Ignition switch ON (II) Measure the voltage to ground:
    There should be battery voltage.
    • Blown No. 21 (7.5 A) fuse in the under-dash fuse/relay box
    • Faulty under-dash fuse/relay box
    • An open or high resistance in the wire
    B9 ORN Ignition switch ON (II), full brake fluid level in the reservoir Measure the voltage to ground:
    There should be at least 5 V.
    • Faulty brake fluid level switch
    • A short to ground in the wire
    Ignition switch ON (II), low brake fluid level in the reservoir Measure the voltage to ground:
    There should be less than 0.2 V.
    • Poor ground (G302) or an open in the ground wire
    • An open or high resistance in the wire
    • Faulty brake fluid level switch
    B10 ORN Ignition switch ON (II), parking brake pedal pressed Measure the voltage to ground:
    There should be less than 0.2 V.
    • Faulty parking brake switch
    • Faulty under-dash fuse/relay box
    • Faulty parking brake switch ground
    • An open or high resistance in the wire
    Ignition switch ON (II), parking brake pedal released Measure the voltage to ground:
    There should be at least 5 V.
    • Faulty parking brake switch
    • Faulty under-dash fuse/relay box
    • Faulty parking brake switch ground
    • A short to ground in the wire
    B24 BLU Ignition switch ON (II), washer fluid level is half or more in the washer reservoir Measure the voltage to ground:
    There should be at least 5 V.
    • Poor ground (G201) or an open in the ground wire
    • Faulty washer fluid level switch
    • An open or high resistance in the wire
    Ignition switch ON (II), washer fluid is empty in the washer reservoir Measure the voltage to ground:
    There should be less than 0.2 V.
    • Faulty washer fluid level switch
    • A short to ground in the wire
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