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Control Unit Input Test

NOTE: Before testing, troubleshoot the multiplex integrated control unit first, using B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A )

Driver's MICU 

  1. Turn the ignition switch to LOCK (0)
  2. Remove the driver's dashboard undercover (see DRIVER'S POCKET REMOVAL/INSTALLATION ), then remove the dashboard lower Cover (see DRIVER'S DASHBOARD LOWER COVER REMOVAL/INSTALLATION ).
  3. Disconnect driver's under-dash fuse/relay box connectors D, Q, and R
    NOTE: All connector views are wire side of female terminals
    Fig 1: Identifying Driver's Under-Dash Fuse And Relay Box Connectors
    G05995108Courtesy of AMERICAN HONDA MOTOR CO., INC.
  4. 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
  5. Reconnect the connectors, turn the ignition switch to ON (II), and do these input tests at the following 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
    TEST CONDITION CHART

    Cavity Wire Test condition Test Desired result Possible cause if result is not obtained
    Q1 BLK Under all conditions Measure the voltage to ground
    There should be less than 0 5 V
    • Poor ground (G502)
    • An open in the wire
    Q2 BRN Under all conditions Measure the voltage to ground
    There should be less than 0 5 V
    • Poor ground (G501)
    • An open in the wire
    R2 BRN Under all conditions Measure the voltage to ground
    There should be less than 0 5 V
    • Poor ground (G501)
    • An open in the wire
    R5 BLK Under all conditions Measure the voltage to ground
    There should be less than 0 5 V
    • Poor ground (G502)
    • An open in the wire
    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 more than 5 V
    • Faulty driver's door switch
    • A short to ground in the wire
    D4 LT
    GRN    		 Left door open Measure the voltage to ground
    There should be less than 1 V
    • Faulty left rear door switch
    • An open in the wire
    Left door closed Measure the voltage to ground
    There should be more than 5 V
    • Faulty left rear door switch
    • A short to ground in the wire
    D5 WHT Trunk lid open (Remove the trunk light bulb) Measure the voltage to ground
    There should be less than 1 V
    • Faulty trunk lid latch switch
    • An open in the wire
    • Poor ground (G901)
    Trunk lid closed (Remove the trunk light bulb) Measure the voltage to ground
    There should be more than 5 V
    • Faulty trunk lid latch 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 more than 5 V
    • Faulty ignition key switch
    • A short to ground in the wire
    R6
    R3    		 RED
    BLK    		 Combination light switch OFF Measure the voltage between terminals R6 and R3
    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 terminals R6 and R3
    There should be more than 5 V
    • Faulty combination light switch
    • A short to ground in the wire
    R7
    R3    		 GRY
    BLK    		 Combination light switch (PARKING position) ON Measure the voltage between terminals R7 and R3
    There should be less than 1 V
    • Faulty combination light switch
    • An open in the wire
    Combination light switch OFF Measure the voltage between terminals R7 and R3
    There should be more than 5 V
    • 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 terminals R8 and R3
    There should be less than 1 V
    • Faulty combination light switch
    • An open in the wire
    Combination light switch OFF Measure the voltage between terminals R8 and R3
    There should be more than 5 V
    • Faulty combination light switch
    • A short to ground in the wire

    Passenger's MICU 

  6. Turn the ignition switch to LOCK (0), and remove the right kick panel (see TRIM REMOVAL/INSTALLATION - DOOR AREAS )
  7. Disconnect passenger's under-dash fuse/relay box connectors A, E, and H
    NOTE: All connector views are wire side of female terminals
    Fig 2: Identifying Passenger's Under-Dash Fuse/Relay Box Connectors
    G05995109Courtesy of AMERICAN HONDA MOTOR CO., INC.
  8. 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 9
  9. Reconnect the connectors to the passenger's under-dash fuse/relay box, and do these input tests at the following 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 10
    TEST CONDITION CHART

    Cavity Wire Test condition Test Desired result Possible cause if result is not obtained
    A14 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
    A25 BRN Ignition switch ON (II) Measure the voltage to ground
    There should be battery voltage
    • Blown No 5 (7 5 A) fuse in the under-hood fuse/relay box
    • Faulty driver's under-dash fuse/relay box
    • An open in the wire
    A36 BLK Under all conditions Measure the voltage to ground
    There should be less than 0 5 V
    • Poor ground (G505)
    • An open in the wire
    A37 BLK Under all conditions Measure the voltage to ground
    There should be less than 0 5 V
    • Poor ground (G505)
    • An open in the wire
    E15 BLK Under all conditions Measure the voltage to ground
    There should be less than 0 5 V
    • Poor ground (G201)
    • An open in the wire
    E16 BLK Under all conditions Measure the voltage to ground
    There should be less than 0 5 V
    • Poor ground (G201)
    • An open in the wire
    H3 GRN Front passenger's door open Measure the voltage to ground
    There should be less than 1 V
    • Faulty front passenger's door switch
    • An open in the wire
    Front passenger's door closed Measure the voltage to ground
    There should be more than 5 V
    • Faulty front passenger's door switch
    • A short to ground in the wire
    H25 LT
    GRN    		 Right rear door open Measure the voltage to ground
    There should be less than 1 V
    • Faulty right rear door switch
    • An open in the wire
    Right rear door closed Measure the voltage to ground
    There should be more than 5 V
    • Faulty right rear door switch
    • A short to ground in the wire

    Gauge Control Module 

  10. Turn the ignition switch to LOCK (0)
  11. Remove the gauge control module (see GAUGE CONTROL MODULE REPLACEMENT ), and disconnect the 32P connector from it
    Fig 3: Identifying Gauge Control Module 32P Connector
    G05995110Courtesy of AMERICAN HONDA MOTOR CO., INC.
  12. 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 13
  13. Reconnect the connector to the gauge control module, turn the ignition switch to ON (II), and do these input tests at the following 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 14
    TEST CONDITION CHART

    Cavity Wire Test condition Test Desired result Possible cause if desired result is not obtained
    16 WHT Under all conditions Measure the voltage to ground
    There should be battery voltage
    • Blown No 15 (10A) 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
    17 BRN Under all conditions Measure the voltage to ground
    There should be less than 0 5 V
    • Poor ground (G501)
    • An open in the wire
    31 LT
    GRN    		 Parking brake lever pulled Measure the voltage to ground
    There should be less than 1 V
    • Faulty parking brake switch
    • An open in the wire
    Parking brake lever released Measure the voltage to ground
    There should be more than 5 V
    • Faulty parking brake switch
    • A short to ground in the wire
  14. Do the Gauge Control Module Self-diagnostic Function (see SELF-DIAGNOSTIC FUNCTION ), and check the beeper and the seat belt reminder indicator
    • If the beeper sounds and the seat belt reminder indicator flashes, go to step 15
    • If the beeper does not sound or the seat belt reminder indicator does not flash, replace the gauge control module (see GAUGE CONTROL MODULE REPLACEMENT )
  15. Substitute a known-good gauge control module, and recheck the system
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