Kia Sorento: 12 V Lithium Auxiliary Battery Description and Operation

Kia Sorento (MQ4, 2021-2026) Service Manual / Body Electrical System / Charging System / 12 V Lithium Auxiliary Battery Description and Operation

Description and Operation Principle

•	The P-LBM (Parking Lithium Battery Module) is an additional 12 V auxiliary battery, separate from the main 12 V battery, designed to provide a stable power supply for vehicle functions while parked.

•	This auxiliary battery system supplies power through a dedicated output line to support functions that operate when the ignition is OFF—such as the built-in camera, afterblow, Kia Connect (CCS), and OTA updates—while the vehicle is parked.

•	The P-LBM uses auxiliary batteries with two capacity options—28.8 Ah or 19.2 Ah—depending on whether the vehicle is equipped with a built-in camera.

•	P-LBM outputs power according to a discharge request signal and supplies power into the vehicle through PDC (the Power Domain Controller).

•	When the SOC (State of Charge) of 12 V main battery is low, P-LBM outputs maximum power and charges the main battery.

•	P-LBM receives a power output request signal from built-in cam unit and supplies power into built-in cam.

•	The system starts supplying power through the ACU (Airbag Control Unit) output circuit when IG2 is ON, and continues for up to 5 minutes after the ignition is turned OFF before stopping.

P-LBM Troubleshooting

Body Electrical System — Charging System / 12 V Lithium Auxiliary Battery / Description and Operation / Description and Operation Principle illustration

P-LBM Image and Connector PIN-MAP

IMAGE	PIN NUMBER	PIN NAME	PIN DESCRIPTION
	1	B+	Power(+)
	2	Ground	Ground
	3	IG2	Power(+)
	4	Not Connect	-
	5	L-CAN 1 High	LOCAL_CAN_H
	6	L-CAN 1 Low	LOCAL_CAN_L
	7	LIN	LIN(Built-in Cam)
	8	Other Unit (+)	OUTPUT(Built-in Cam)
	9	Other Unit (+)	OUTPUT(ACU)
	10	Not Connect	-
	11	Not Connect	-
	12	Not Connect	-

Charging System

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12 V Lithium Auxiliary Battery Removal and Installation

Removal 1. Remove the front seat assembly. [Passenger's side] (Refer to Body - "Front Seat Assembly") ...

Kia Sorento: 12 V Lithium Auxiliary Battery Description and Operation

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