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Vehicle Interface Unit

WARNING: Vehicles are equipped with Supplemental Inflatable Restraint (SIR) system. Before attempting any repairs involving steering column, instrument panel or related components, see SERVICE PRECAUTIONS and DISABLING & ACTIVATING AIR BAG SYSTEM in appropriate AIR BAG RESTRAINT SYSTEMS article.
CAUTION: Use correct fastener in correct location. Replacement fasteners must be correct part number for application. Fasteners requiring replacement or fasteners requiring use of thread locking compound or sealant are identified in service procedures. DO NOT use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage fastener. Use correct tightening sequence and specifications when installing fasteners in order to avoid damage to part and systems.
NOTE: Never exchange Vehicle Interface Unit (VIU) from another vehicle. VIU has a 10-digit Specific Station Identification (STID) number.
  1. VIU is located behind left side of instrument panel, above Vehicle Communication Unit (VCU). See Figure . Turn ignition switch to LOCK position. Pull windshield garnish molding from "A" pillar in order to disengage retaining tabs and clips. See Figure . Remove windshield garnish molding from "A" pillar.
    2. CAUTION: Remove Instrument Panel (IP) upper trim panel slowly, retainer clips could possibly fall into IP.
  2. Lift IP upper trim panel approximately 2" (51 mm) and pull rearward to release retainers. See Figure . Remove Daytime Running Light (DRL) ambient light sensor and sun load sensor from IP upper trim panel (if equipped). Turn DRL and sun load sensors counterclockwise to remove. Remove IP upper trim panel.
  3. Disconnect VIU Blue 32-pin harness connector. Disconnect VIU Red 32-pin harness connector. Disconnect Global Position System (GPS) cables from VIU.
    4. NOTE: DO NOT remove VCU/VIU bracket bolts.
  4. Loosen 4 VCU/VIU bracket bolts and release hook tab by rotating VIU upward in order to remove VIU from bracket. Remove VIU and record VIU 10-digit STID number.
  5. To install, reverse removal procedure. Tighten VCU/VIU bracket bolts to 89 INCH lbs. (10 N.m). Contact OnStar(R) support line by pressing Blue OnStar(R) button twice. OnStar(R) support line will require 10-digit STID number recorded in step  4 .
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