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Home >> Honda >> 2012 >> Accord SE >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 84 (Entry Lights Control System (V6)) >> Control Unit Input Test
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Control Unit Input Test

WARNING: This page is about a different variant/trim than selected.
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), and remove the driver's dashboard lower cover (see DRIVER'S DASHBOARD LOWER COVER REMOVAL/INSTALLATION ).
  2. Remove the driver's dasherboard lower cover. See DRIVER'S DASHBOARD LOWER COVER REMOVAL/INSTALLATION
  3. Disconnect driver's under-dash fuse/relay box connectors D, P, Q, and R.
    NOTE: All connector views are shown in illustration from wire side of female terminals.
    Fig 1: Identifying Drivers Under-Dash Fuse/Relay Box Connectors Terminals Identification (D, P, Q And R)
    G07352242Courtesy 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 look OK, go to step 5.
  5. Reconnect the connectors to the driver's under-dash fuse/relay box, 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, go to step 6.
    TEST CONDITIONS REFERENCE CHART

    Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
    Q1 BLK Under all conditions Measure the voltage to ground: There should be less than 0.2 V.
    • Poor ground (G502)
    • An open on high resistance in the ground wire
    Q2 BRN Under all conditions Measure the voltage to ground: There should be less than 0.2 V.
    • Poor ground(G501)
    • An open on high resistance in the ground wire
    R2 BRN Under all conditions Measure the voltage to ground: There should be less than 0.2 V.
    • Poor ground(G501)
    • An open on high resistance in the ground wire
    R5 BLK Under all conditions Measure the voltage to ground: There should be less than 0.2 V.
    • Poor ground(G502)
    • An open on high resistance in the ground wire
    D4 (4-door) LT GRN Left rear door open Measure the voltage to ground: There should be less than 0.2 V.
    • Faulty left rear door switch
    • Faulty left rear door switch ground
    • An open on high resistance in the wire
    Left rear door closed Measure the voltage to ground: There should be about 5 V.
    • Faulty left rear door switch
    • A short to ground in the wire
    D12 BRN Driver's door open Measure the voltage to ground: There should be less than 0.2 V.
    • Faulty driver's door switch
    • Faulty driver's door switch ground
    • An open on high resistance in the wire
    Driver's door closed Measure the voltage to ground: There should be about 5 V.
    • Faulty driver's door switch
    • A short to ground in the wire
    P4 PNK Ceiling light switch in the middle position. Interior light switch in the DOOR position, Map lights in the DOOR position Attach to ground with a jumper wire: The ceiling light and front individual map light should come on.
    • Blown No. 16 (7.5 A) fuse in the under-hood fuse/relay box
    • Faulty ceiling light
    • Faulty front individual map light
    • Faulty interior light switch
    • Blown bulb
    • An open on high resistance in the wire
    Q11 RED Under all conditions Attach to ground with a jumper wire: The ignition key light should come on.
    • Blown No. 16 (7.5 A) fuse in the under-hood fuse/relay box
    • Faulty ignition key light
    • An open on high resistance in the wire
    Q18 WHT Ignition key inserted into the ignition switch Measure the voltage to ground: There should be less than 0.2 V.
    • Faulty ignition key switch
    • Poor ground (G503) or an open in the ground wire
    • An open on high resistance in the wire
    Ignition key removed from the ignition switch Measure the voltage to ground: There should be about 5 V.
    • Faulty ignition key switch
    • A short to ground in the wire

    Passenger's MICU 

  6. Turn the ignition switch to LOCK (0).
  7. Remove the passenger's kick panel.
  8. 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 Terminals (A, E And H)
    G07352243Courtesy of AMERICAN HONDA MOTOR CO., INC.
  9. 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 10.
  10. Reconnect the connectors to the passenger's under-dash fuse/relay box, 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, go to step 11.
    TEST CONDITIONS REFERENCE CHART

    Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
    A36(1) BLK In all ignition switch position Measure the voltage to ground: There should be less than 0.2 V.
    • Poor ground(G505)
    • An open or high resistance in the ground wire
    A37 BLK In all ignition switch position Measure the voltage to ground: There should be less than 0.2 V.
    • Poor ground(G505)
    • An open or high resistance in the ground wire
    E15 BLK In all ignition switch position Measure the voltage to ground: There should be less than 0.2 V.
    • Poor ground(G201)
    • An open or high resistance in the ground wire
    E16 BLK In all ignition switch position Measure the voltage to ground: There should be less than 0.2 V.
    • Poor ground(G201)
    • An open or high resistance in the ground wire
    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 or high resistance in the wire
    A35 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 or high resistance in the wire
    H3 GRN Front passenger's door open There should be less than 0.2 V. Measure the voltage to ground:
    • Faulty front passenger's door switch
    • Faulty front passenger's door switch ground
    • An open or high resistance in the wire
    Front passenger's door closed There should be about 5 V. Measure the voltage to ground:
    • Faulty front passenger's door switch
    • A short to ground in the wire
    H25 (4-door) LT GRN Right rear door open Measure the voltage to ground: There should be less than 0.2 V.
    • Faulty right rear door switch
    • Faulty right rear door switch ground
    • An open or high resistance in the wire
    Right rear door closed Measure the voltage to ground: There should be about 5 V.
    • Faulty right rear door switch
    • A short to ground in the wire
    (1) '08-09 models

    Door Multiplex Control Unit 

  11. Turn the ignition switch to LOCK (0).
  12. Remove the power window master switch
  13. Disconnect the 37P connector from the power window master switch.
    Fig 3: Identifying Power Window Master Switch Connector Terminals
    G07352244Courtesy of AMERICAN HONDA MOTOR CO., INC.
  14. 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 15.
  15. Reconnect the 37P connector to the power window master switch, 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, go to step 16.
    TEST CONDITIONS REFERENCE CHART

    Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
    32 BLK In all ignition switch position Measure the voltage to ground: There should be less than 0.2 V.
    • Poor ground (G501)
    • An open or high resistance in the ground wire
    37 BLK in all ignition switch position Measure the voltage to ground: There should be less than 0.2 V.
    • Poor ground (G502)
    • An open or high resistance in the ground wire
    13 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 or high resistance in the wire
    30 YEL Driver's door lock knob switch in LOCK Measure the voltage to ground: There should be less than 0.2 V.
    • Faulty driver's door lock knob switch
    • Poor ground (G501) or an open in the ground wire
    • An open or high resistance in the wire
    Driver's door lock knob switch in neutral or UNLOCK Measure the voltage to ground: There should be battery voltage.
    • Faulty driver's door lock knob switch
    • A short to ground in the wire
    31 WHT Driver's door lock knob switch in UNLOCK Measure the voltage to ground: There should be less than 0.2 V.
    • Faulty driver's door lock knob switch
    • Poor ground (G501) or an open in the ground wire
    • An open or high resistance in the wire
    Driver's door lock knob switch in neutral or LOCK Measure the voltage to ground: There should be battery voltage.
    • Faulty driver's door lock knob switch
    • A short to ground in the wire
  16. If multiple failures are found on more than one control unit, replace the driver's under-dash fuse/relay box (includes the driver's MICU).

    If input failures are related to a particular control unit, replace the control unit.

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