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 MANUALSKIA2011OPTIMA L4-2.0L TURBOREPAIR AND DIAGNOSISPOWER AND GROUND DISTRIBUTIONRELAY BOXDESCRIPTION AND OPERATION
2011 Kia Optima L4-2.0L Turbo
Relay Box: Description and Operation
2011 Kia Optima L4-2.0L TurboSECTION Description and Operation
Description
Network Configuration
The Network of the SJB(Smart Junction Box) consists of Low speed CAN as shown in the following figure.
Termination Resistor
The cluster has CAN termination resistor. It is possible that CAN termination resistor value is changed by number of CAN controller. The termination resistor value of the cluster is 510 Ohms.
Function
Function Requirements
The BCM controls IPS and relay on the SJB. For example, if BCM requests head lamp low beam control, then BCM requests related lamp control at one time.
Signal Flow Diagram
This chapter defines signal between SJB and peripheral electrical apparatus in the form of signal flow diagram. Control of the IPS and relay is required by BCM. Following figure expresses power source that is operating power condition
Input signal
Output signal
Door Switch Input
Door Lock Switch Input
Door Unlock Status Input
P/WDW DR Lock/Unlock Input
Brake Switch Input
Seat Belt Switch Input
Trunk Switch Input
Hood Open Switch Input
CANADA DRL Option
INHIBIT 'R' Input
Burglar Alarm Start Relay
Burglar Alarm Horn Relay
Door Lock/Unlock Relay
Trunk LID Release Relay Output
Power Window Relay Output
Defogger & Front Deicer Relay
Head Lamp Control
IPS Lamp Control
Hazard & Turn Signal
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.