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)COMPONENTS AND COMPONENTS LOCATIONBCM CONNECTOR TERMINALSBCM INPUT SIGNAL SPEC
2015 Kia Optima EX
BCM Input Signal SPEC
2015 Kia Optima EXSECTION BCM Input Signal SPEC
BCM Input Terminal Voltage List
| Pin name | Description | Interface |
|---|---|---|
| V_B+ | ECU power supply | 12V (Battery voltage) |
| L_IGN1 | High side switch | ON = 12V |
| L_IGN2 | High side switch | ON = 12V |
| A_ACC | High side switch | ON = 12V |
| L_MIST SW | High side switch | ON = 12V |
| L_TAIL LAMP SW | High side switch | ON = GND |
| L_KEY IN SW | Low side switch | ON = GND |
| L_KEY INTER LOCK SW | Low side switch | ON = GND |
| L_REAR DEFOGGER SW | Low side switch | ON = GND |
| L_REAR FOG LAMP SW | Low side switch | ON = GND |
| L_PAS OPT | Low side switch | ON = GND |
| L_SUNROOFOPEN SW | Low side switch | ON = GND |
| L_AUTOFOLDING SW | Low side switch | GND = Folding, Open = Unfolding |
| L_FRONT WASHER SW | High side switch | ON = 12V |
| L_FRONT INT WIPER SW | High side switch | ON = 12V |
| L_INH'R' | High side switch | ON = 12V |
| L_BRAKE SW | High side switch | ON = 12V |
| L_RR SBR SW | Low side switch | ON = GND |
| L_RC SBR SW | Low side switch | ON = GND |
| L_RL SBR SW | Low side switch | ON = GND |
| L_RPAS OFF SW / L_PAS_SW | Low side switch | ON = GND |
| L_Dedicated_DRL OPT | Low side switch | ON = GND |
| L_HEAD LAMP LOW SW | Low side switch | ON = GND |
| L_HEAD LAMP HI SW | Low side switch | ON = GND |
| L_FRONT FOG LAMP SW | Low side switch | ON = GND |
| L_AUTO LIGHT SW | Low side switch | ON = GND |
| L_TMU Rx | Low side switch | ON = GND |
| A_FRONT WIPER INT VOLUME SW | Analog input | H = 5V, L = 0V |
| A_AUTO LIGHT SIGNAL | Analog input | H = 5V, L = 0V |
| P_CRASH UNLOCK INPUT | PWM input | H = 12 L = 0V |
| V_AutoLightPwr | Power output | 5V |
| GND (AUTO LIGHT) | Ground output | 0V |
| V_RPASPwr (reserved) | Power output | 8.5V |
| GND (RPAS) | Ground output | 0V |
| DIAGNOSIS (K-LINE) | Diagnostic Communication (K-line) | |
| CAN_H | CAN high signal | |
| CAN_L | CAN low signal | |
| GND1 (BCM) | Power ground 1 (BCM) | |
| GND2 (BCM) | Power ground 2 (BCM) |
RENDER: 1.0x
NO RELATED
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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.