Hyundai Elantra AD: Fuses And Relays - Body Electrical System - Hyundai Elantra AD 2017-2020 Service ManualHyundai Elantra AD: Fuses And Relays

Components and Components Location

Component Location
[Engine Room]

1. Engine room junction block

[Interior Relay]

1. Smart junction block (SJB)

Relay Box (Engine Compartment) Components and Components Location

Component Location
Engine Room Junction Block

Metal Core Block (PCB)

Relay Box (Engine Compartment) Repair procedures

Inspection
1. Disconnect the negative (-) battery terminal.
2. Pull out the relay from the engine compartment relay block.
Power Relay (Type A)

Check for continuity between the terminals.

1. After supplying power to between No. 85 and 86 power relay terminals, check that there is continuity between No. 30 and 87 terminals.
2. After disconnecting power between No. 85 and 86 power relay terminals, check that there is no continuity between No. 30 and 87 terminals.

Engine Room Relay Block
Power Relay (Type B)

Check for continuity between the terminals.

1. After supplying power to between No. 85 and 86 power relay terminals, check that there is continuity between No. 30 and 87 terminals.
2. After disconnecting power between No. 85 and 86 power relay terminals, check that there is no continuity between No. 30 and 87 terminals.
PCB block
1. Disconnect the negative (-) battery terminal.
2. Push the four hooks (B) in the direction of the arrow and lift up the PCB block (A).

3. Remove the PCB block by disconnet the connector.

Fuse
1. Check that the fuse holders are loosely held and that the fuses are securely fixed by the holders.
2. Check that each fuse circuit has the exact fuse capacity.
3. Check the fuses for any damage.
  
• If a fuse is to be replaced, be sure to use a new fuse of the same capacity. Always identify the cause of the blown fuse and completely eliminate the problem before installing a new fuse.
Multi Fuse

Engine room fuse is to optimize the package.

  
• The entire multi fuse (A) has to be replaced even if only one fuse is damaged.
• When replacing it, refer to "the Engine compartment- component location" diagram to check fuse capacities and circuit arrangement.
• Use the multi fuse of the exact fuse capacity for each circuit.

Relay Box (Passenger Compartment) Components and Components Location

Component Location
Interior Junction Block

Relay Box (Passenger Compartment) Description and Operation

Description
Auto Cut System of Dark Current

Abbreviation
 Expalnation
ACU
 Airbag Control Unit
ADM
 Assist Door Module
B_CAN
 Body Controller Area Network
BCM
 Body Control Module
BSD
 Blind Spot Detection
C_CAN
 Chassis Controller Area Network
CLU
 Cluster Module
DATC
 Dual Automatic Temp Control
DDM
 Driver Door Module
ESC
 Electronic Stability Program
EMS
 Engine Management System
LKAS
 Lane Keeping Assist System
M_CAN
 Multi media Controller Area Network
MDPS
 Motor Driven Power Steering
P_CAN
 Powertrain Controller Area Network
PSM
 Power Seat Module
SAS
 Steering Angle Sensor
SJB
 Smart Junction Block
SMK
 Smart Key Unit
PAS
 Parking Assist System
TCU
 Transmission Control Unit
TPMS
 Tire Pressure Monitoring System
VDC
 Vehicle Dynamic Control
TMU
 Telematics System
ABS
 Anti-lock Brake System
SCC
 Smart Cruise Control

Smart Junction Block (SJB)

General function : Interior Junction Block + some functions of BCM

It controls loads with CAN communication and IPS.

IPS stands for Intelligent Power Switch, which uses the semiconductor technology to replace the current role of fuse and relay. (The IPS device protects the current load control function from the overcurrent.)

  
The advantages of IPS are as follows:
- Reduce relay and consequently decrease weight and volume
- Remove the relay operation noise
- Not necessary to replace fuse, increasing the product life
- Diagnosis capability
SJB control entry
1. Switch signal input
(1) Assist seat belt switch

Assist the door switch

Driver's seat belt switch

Rear left door switch

Rear right door switch

IGN1 switch

IGN2 switch

Brake fluid sensor

Trunk lid handle switch

HID head lamp option

Hazard lamp switch

Head lamp low beams switch

Hood switch

Left front / rear turn signal switch

Right front / rear turn signal switch

Parking brake switch

Driver the door lock/unlock control status

Assist the door lock/unlock control status

Rear left the door lock/unlock status

Rear right the door lock/unlock status

Driver the door switch

Driver the door key lock switch

Driver the door key unlock switch

Driver the door power window lock switch

Driver the door power window unlock switch
(2) IPS&ARISU

Left Head lamp low beams

Right Head lamp low beams

Left Head lamp high beams

Right Head lamp high beams

Room lamp

Exterior left tail lamp

Exterior right tail lamp

Left front / rear turn signals

Right front / rear turn signals

DRL left lamp

DRL right lamp

Body resistance cut control

Front left turn signal output

Front right turn signal output
(3) Relay Control

Rear glass heater relay

Trunk lid relay

Front glass heater relay

Head lamp high beams relay

Memory fuse switch relay

Door lock/unlock relay

Power window wake-up relay

2 Turn door lock relay
2. SJB protection
(1) PCL (Programmable Current Limit) functions
A. Replace the current junction box fuse function to protect the wire.
B. How to operate : If the lamp current exceeds the standard level, cut off the lamp current to protect lamp.
C. Lamp cut off time : 300ms or less.
D. Applied load : Applied to all lamp loads controlled by SJB.
E. Output the error code according to the error detection conditions.
(2) OCL (Open Current Limit)
A. Detect the lamp open state and inform the user of it.
B. How to operate: Detect the current of the lamp and if it is below the standard level, change the lamp operation.
C. Applied load: Applied to the turn signal lamp 4 channel
D. Output the error code according to the error detection conditions.
3. SJB fail safe function
(1) When SJB has a failed MCU (not operating due to a physical or electrical shock from the outside), the head lamp low and exterior and interior tail lamp are turned on to secure the driver if IGN2 is on and the head lamp low switch is on.
(2) When the data transmission/reception fails due to a failed CAN communication line connected with SJB module (disconnection of both high and low line, high/low BAT short, high/low GND short), the head lamp low and interior/exterior tail lamps are turned on if IGN2 is on and the head lamp low switch is on.
4. Auto Cut System of Dark Current
(1) Description : It cuts automatically power to be provided with load for reducing useless dark current according to vehicle state.

(2) SJB had 3 modes, "Normal Mode", "Sleep Mode", "Power Off Mode". Auto cut of dark current practice in "Sleep Mode".
A. "Sleep" condition : IG OFF, constant input switch, CAN network doesn't activate.
B. "Sleep" resolutive condition : Any switch inputs, CAN network activates, KEY ON, IGN ON
C. "Power OFF" condition : The setting time of timer which is used by cutting a load power expires.
D. "Normal Mode" : SJB function normally activates.
E. "Sleep Mode" : It is low power mode and activates for reducing electricity consumption of SJB or IPM. Auto cut of dark current function activates.
F. "Power OFF Mode" : Power of MCU and circumferential circuit is cut for minimizing electricity consumption. Operation stops.
(3) The explanation - The auto cut of dark current

Before delivering to customer
Fuse switch OFF
• All door close & RKE door lock or Constant switch state

(Auto cut of dark current scenario starts.)
- After "Sleep" state is for 5 min.
- SJB power down(SJB dark current : 200 ?A) and cutting power of Lamp

/Multimedia Load/Wake up/Immobilzer


After delivering to customer
Fuse switch ON
• All door close & Constant switch state : C_BAState=OFF

(Auto cut of dark current scenario starts.)
- After "Sleep" state is for 20 min.
• In case RKE door lock : C_BAState=ON & Trunk SW=CLOSE

(Auto cut of dark current scenario starts.)
- After "Sleep" state 35s~65s (Waiting time of other unit : 30~60s + SJB

sleep counts 5s)


(4) Problem when fuse switch setting is wrong

: If a fuse switch is set to OFF(Before delivering to customer) by a customer or technician and auto cut function of dark current activates, below problems may happen.

Symptom
Related part
• Door lock/unlock, trunk open don't activate by RKE.

(Wakeup of each module don't activate.)
BCM
• Digital clock is reset.(Memory is reset.)
Digital clock
• Setting value of audio(Volume, Frequency setting) is reset.

(Memory is reset.)
Audio

* If fuse switch OFF (before delivering to customer) is set, power of BCM, Digital clock and audio is shut off.

Relay Box (Passenger Compartment) Repair procedures

Fuse Inspection
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 correct?
3. Are there any blown fuses?
  
• If a fuse is to be replaced, be sure to use a new fuse of the same capacity. Always determine why the fuse blew first and completely eliminate the problem before installing a new fuse.
Diagnosis with GDS
1. The body electrocal system can be quickly diagnosed failed parts with vehicle diagnostic system (GDS).

The diagnostic system (GDS) provides the following information.

(1) 1) Self diagnosis : Checking the failure code (DTC) and display
(2) 2) Current data : Checking the system input/output data state
(3) 3) Actuator test : Checking the system operation condition
(4) 4) Additional function : Other controlling such as he system option and zero point adjustment
2. Select the "Car Model" and the system to be checked in order to check the vehicle with the tester.
3. Select the "Smart Junction Block (SJB)".
4. Select the "Current Data" menu to search the current state of the input/output data.

The input/output data for the sensors corresponding to the Smart Junction Block (SJB) can be checked.
5. If you will check the power door lock operation forcefully, select "Actuation Test".
6. If you want to change user option, select "User Option".
Removal
1. Disconnect the negative (-) battery terminal.
2. Remove the crash pad lower panel.

(Refer to Body - "Crash Pad Lower Panel")
3. Disconnect the connectors (A) from the fuse side of the SJB.
4. Remove the SJB (A) after loosening the mounting nuts.
5. Disconnect the connectors from the back side of the SJB.
Installation
1. Install the smart junction box.
2. Install the crash pad lower panel.
3. Connect the negative (-) battery terminal.
4. Check that all system operates normally.
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