Hyundai Tucson: Fuses And Relays / Relay Box (Passenger Compartment) Description and Operation

Hyundai Tucson (LM) 2010-2015 Service Manual / Body Electrical System / Fuses And Relays / Relay Box (Passenger Compartment) Description and Operation

Description

SJB (Smart Junction Box)

Specification

Item	Requirement	Remark
Rated voltage	DC 12V	x
Voltage range	DC 8 ~ 16V	Normal operating in this range
Storage temperature	-40°C ~ +95°C	x
Operating temperature	-30°C ~ +85°C	x
Operating humidity	85%	PCB, Damp proofing, Coating, etc.
Dark current	Max. 200uA	All Load Open
Operation Voltage Range	DC 8 ~ 16V	Should activate normally in normal range
Max Use Humidity	85%	Regulated together with parts needing insulation such as PCB, damp-proofing, coating, etc
Insulation Resistance	Should be no ignition caused by electrical shorts

Rated Burden

Item	Rated Burden
Head Lamp Low LH	55W
Head Lamp Low RH	55W
Head Lamp High LH	60W (Max)
Head Lamp High RH	60W (Max)
Tail Lamp LH	41W(Max)
Tail Lamp RH	31W(Max)
Front Fog Lamp LH+RH	54W
Interior Lamp	45W
B/Alarm Start Relay Coil Control	0.9W
RR FOG Relay Coil Control	0.6W
Lift Gate Latch or Luggage Room Lamp (Power Lift Gate) Relay Coil Control	0.6W
Back Up Relay Coil Control	0.45W
RR Wiper Relay Coil Control (External)	12W (Output Max)
B/Alarm Horn Relay Coil Control (External)	12W (Output Max)
RR.HTD Relay Coil Control (External)	12W (Output Max)
Front Deicer Relay Coil Control (External)	12W (Output Max)

3.	Block Diagram

SJB Main Functions

(1)	Lamp control and wire protection through IPS .

(2)	When Reference Voltage exceeded, PWM normal voltage control to prevent lamp loss or damage

(3)	CAN outpout for switch signal input .

(4)	Diagnosis using CAN (Short to GND, Open Circuit)

(5)	Fail Safe lamp control.

NO	Section	Content
1	Enter Input SW	Receive switch input and send switch status as CAN message to each module
2	Lamp Control (IPS)	Receive commands from BCM as CAN message to control Lamps with IPS
3	Internal Relay Control	Receive commands from BCM as CAN message and control relays in the IP Box
3	Internal Relay Control	T/Gate latch, B/Alarm start, Backup, Rear Fog lamp
4	External Relay Control	Receive commands from BCM as CAN message and control relays outside of the IP Box
4	External Relay Control	B/Alarm horn, Rear Wiper motor, Rear deffogger, Front deicer
5	Low Power Mode (Sleep Mode)	When there is no change in the CAN message or switch input for 5 seconds, converts to low-power mode (sleep mode)
6	WakeUp Mode	When there is a change in the CAN message or Input switch in low-power mode, converts to normal mode
7	Output status send	Lamps and Rear Fog output status sent to BCM as CAN message
8	H/W Rescure	When MCU fails, and Head Lamp Low Switch is input, Head Lamp Low Beam activates

Network

6.	CAN input & output flow

Relay Box (Passenger Compartment) Components and Components Location

Component Location ...

Relay Box (Passenger Compartment) Repair procedures

Inspection Fuse 1. Be sure there is no play in the fuse holders, and that the fuses are held securely. 2. Are the fuse capacities for each circuit correctx 3. Are there any blown fusesx ...

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