Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSKIA2015OPTIMA EXREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTCOMMUNICATION DEVICESBODY CONTROL MODULE (BCM) - OPTIMA (EXCEPT HEV)BODY CONTROL MODULE (BCM)REPAIR PROCEDURESTROUBLE DIAGNOSTICS WHEN USING GDS

2015 Kia Optima EX

Trouble Diagnostics When Using GDS

2015 Kia Optima EXSECTION Trouble Diagnostics When Using GDS

Fig 1: Locating Data Link Connector

Courtesy of KIA MOTORS AMERICA, INC.

The Body Control Module can diagnose by using the GDS more quickly.
The BCM communicates with the GDS and then reads the input/output value and drives the actuator.
To diagnose the BCM function, select the menu of model and body control module.
To consult the present input/output value of BCM, "Current DATA". It provides information of BCM input/output conditions of power supply, turn signal/brake lamp, headlamp, door, locks, outside mirror, wiper, auto-light and transmitters etc.

BCM Service data

Fig 2: Scantool Display - BCM Service Data
Courtesy of KIA MOTORS AMERICA, INC.
CLU (Cluster) Service data

Fig 3: Scantool Display - CLU (Cluster) Service Data
Courtesy of KIA MOTORS AMERICA, INC.
SJB (Smart Junction Box) Service data

Fig 4: Scantool Display - SJB (Smart Junction Box) Service Data
Courtesy of KIA MOTORS AMERICA, INC.
To perform compulsory operation on BCM input factors, select "ACTUATION TEST".

Fig 5: Scantool Display - Actuation Test
Courtesy of KIA MOTORS AMERICA, INC.

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.