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HOMESERVICE MANUALSBUICK2012VERANOREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 67 (HANDSFREELINK SYSTEM)CONTROL UNIT INPUT TEST/REPLACEMENT
2012 Buick Verano

Control Unit Input Test/Replacement

2012 Buick VeranoSECTION Control Unit Input Test/Replacement
WARNING: This page is about a different car, the 2011 Honda Insight and 2010 Honda Insight. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the glove box (see GLOVE BOX REMOVAL/INSTALLATION ).
  2. Remove the passenger's dashboard undercover (see PASSENGER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION ).
  3. Disconnect the 28P connector (A) from the HandsFreeLink control unit (B).
    Fig 1: HandsFreeLink Control Unit With Torque Specifications And 28P Connector
    G06432042Courtesy of AMERICAN HONDA MOTOR CO., INC.
  4. 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 5.
  5. 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 6.
    TEST CONDITION 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 0.5 V.
    • Poor ground (G503)
    • An open in the wire
    15 PNK Under all conditions Check for voltage to ground: There should be battery voltage.
    • Blown No. 1 (15 A) fuse in the under-dash fuse/relay box
    • An open in the wire
    16 PUR Ignition switch ON (II) Check for voltage to ground: There should be battery voltage.
    • Blown No. 14 (7.5 A) fuse in the under-dash fuse/relay box
    • An open in the wire
  6. Disconnect the 28P connector again, and make 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.
    TEST CONDITION CHART

    Cavity Wire Test condition Test: Desired result Possible cause if desired result is not obtained
    18 GRN Under all conditions Check for continuity between No. 18 terminal and the driver's under-dash fuse/relay box connector Q (16P) terminal No. 3: 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
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.