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Control Unit Input Test/Replacement

  1. Remove these item:
  2. Disconnect the 28P connector (A) then remove the bolts (B) from the HandsFreeLink control unit (C).
    Fig 1: Identifying 28P Connector Terminals
    G06612952Courtesy of AMERICAN HONDA MOTOR CO., INC.
  3. Inspect the connector and socket terminals for a good pinfit 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. Reconnect the connector 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, go to step 5.
    CONTROL UNIT INPUT TEST REFERENCE CHART

    Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
    1 BLK Under all conditions Check for voltage to ground: There should be less than 1.0 V.
    • Poor ground (G503)
    • An open in the wire
    15 ORN 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
    16 WHT Ignition switch ACC (I) or ON (II) Check for voltage to ground: There should be battery voltage.
    • Blown No. 34 (7.5 A) fuse in the under-dash fuse/relay box
    • An open in the wire
  5. Disconnect the 28P connector again, and do this input test at the connector.
    • If the test indicates a problem, find and correct the cause, then recheck the system.
    • If the input test proves OK, the HandsFreeLink control unit must be faulty; replace it.
    CONTROL UNIT INPUT TEST REFERENCE CHART

    Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
    18 PNK Under all conditions Check for continuity between No. 18 terminal and the driver's under-dash fuse/relay box connector Q (16P) terminal No. 6: There should be continuity. An open in the wire
    Driver's under-dash fuse/relay box connector Q(16P) disconnected Check for continuity to ground: There should be no continuity. Short to ground
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