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Gauge Control Module (Speedo) Input Test

NOTE: Before testing, do the gauge control module self-diagnosis procedure, and make sure the B-CAN communication line and the UART line are OK.
  1. Turn the ignition switch OFF.
  2. Remove the gauge control module (speedo) and disconnect the 12P connector from it (see GAUGE CONTROL MODULE REPLACEMENT  ).
    Fig 1: Identifying Gauge Control Module (Speedo) 12P Connector
    G06268852Courtesy 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, make these input tests at the connector.
    • 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.
      TEST CONDITION CHART

      Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained
      11 BLU Ignition switch ON, turn signal switch in LEFT Check for voltage to ground:
      There should be battery voltage when the lights are flashing.
      • Faulty MICU
      • Faulty combination light switch
      • An open in the wire
      12 GRN Ignition switch ON, turn signal switch in RIGHT Check for voltage to ground:
      There should be battery voltage when the lights are flashing.
      • Faulty MICU
      • Faulty combination light switch
      • An open in the wire
      7 1m LT GRN GRYm Under all conditions (disconnect the GAUGE CONTROL MODULE (TACH)  36P connector) Check for continuity between the No. 7 1n terminal and gauge control module (tach) 36 P connector No. 20 2m n terminal:
      There should be continuity.      		 An open in the wire
      Check for continuity between the No. 7 1 m terminal and body ground (gauge control module (tach) 36P connector disconnected):
      There should be no continuity.      		 A short to ground in the wire
      m: TYPE S model
  5. Reconnect the connector to the gauge control module (speedo), and make these input tests at the connector.
    • 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 (speedo) must be faulty; replace it.
      TEST CONDITION CHART

      Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained
      6 WHT Under all conditions Check for voltage to ground:
      There should be battery voltage.
      • Blown No. 23 (10 A) fuse in the under-hood fuse/relay box
      • An open in the wire
      5 BRN Ignition switch ON (II) Check for voltage to ground:
      There should be battery voltage.
      • Blown No. 10 (7.5 A) fuse in the under-dash fuse/relay box
      • An open in the wire
      4 BLK Under all conditions Check for voltage to ground:
      There should be less than 0.5 V.
      • Poor ground (G504)
      • An open in the wire
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