2012 Kia Optima SXFACTORY OEM SERVICE PROCEDURE

Serial Communication Status Check

WARNING: This page is about a different car, the 2013 Kia Sportage and 2012 Kia Sportage. However, it is still accessible from the selected car via links, so may be relevant.
  1. Connect the cable of GDS to the data link connector in driver side crash pad lower panel.
  2. Select the "Serial Communication Line Check".
    Fig 1: Scantool Display - Serial Communication Line Check
    G07426711Courtesy of KIA MOTORS AMERICA, INC.
  3. After IG ON, select the "Receiver Communication Line Check".
    Fig 2: Scantool Display - Receiver Communication Line Check
    G07426712Courtesy of KIA MOTORS AMERICA, INC.
  4. Check the serial communication line with a GDS.
  5. If the smart key runs normal, the communication of smart key unit and exterior receiver are normal.
  6. If the smart key system does not operate properly, check the following items.
    1. Disconnection or no response of the exterior receiver communication line.
    2. The exterior receiver communication line disconnection and ground connection.
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

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.

Rather have a pro handle this?

A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.

Comes to youSame-day available12-month warranty
Get a Free Quote

No obligation. See pricing before you book.