Relay Box: 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 SJB 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 SJB 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
















B/Alarm Start Relay Control





B/Alarm Horn Relay Control





Door Switch Input Control





Door Lock Control





Door Unlock Status Control





DRL Ground Control





Door Lock Switch Input Control





Power window Relay Control





Rear Defogger & Front Deicer Relay Control





Seat Belt Switch Input Control





Trunk Switch Input Control





Hood Switch Input Control





Power Window Lock/unlock Switch Input Control





IPS Lamp Activity





IPS Lamp Command

Function Definition





Turn Signal

Function Definition




1. Turn Signal by ' Turn Signal LH switch' and ' Turn Signal RH switch' works during 'Ign1=ON' or ' IGN2=ON'.
2. Lane Change function (3 times blinking) works when 'ON time' of 'Turn signal left switch' or 'Turn signal right switch' is shorter than 1.8sec. During double blinking, it blinks 4 times.
3. Lane change function would be immediately stopped when opposite direction switch or ' Hazard switch' is ON.
4. Hazard function by 'HAZARD from BCM' has priority to Switch input.
5. Diagnosis for 'Open Load' and 'Short to GND' should be applied to each load during operation when 'Ign1=ON' or ' IGN2=ON'.
6. During ' Turn Signal LH switch = ON' or ' Turn Signal RH switch = ON', Double blinking function starts even 1 load is 'Open Load' condition.
7. When 'Short to GND' is detected, power supply to the related load would be stopped.
8. When 'Open Load' or 'Short to Ground' is detected, this diagnosis condition would be kept before one of ' Ign1=OFF', ' IGN2=OFF' or ' Turn Sigma; LH switch = OFF', ' Turn Signal RH switch = OFF' and ' Hazard switch = OFF' is set.
9. Normal Blinking Period: 85±10 period/min (duty 50%±5%)
10. Double Blinking Period: 157±10 period/min (duty 50%±5%). (But, initial blinking is normal blinking)

Blinking
- CAN message controls turn signal blinking until ' HAZARD from BCM = INACTIVE'. ON/OFF Period and Duty ratio are set by BCM.
- Blinking period by 'Hazard Switch' and 'Turn Signal Lever Switch' would be affected by turn signal diagnosis.
- Blinking by CAN message has priority to blinking by 'Hazard Switch' and 'Turn Signal Lever Switch'
- Blinking by switch should be stopped immediately and blinking would be controlled by CAN if ' HAZARD from BCM = ON/OFF' until ' HAZARD from BCM = INACTIVE'.
- Blinking is repetitive on/off control of turn signal with 50±5% duty ratio.




- Blinking Period is as follows.
1 Normal Blinking Period : 85±10period/min, duty 50%±5%
2 Double Blinking Period : 157±10period/min, duty 50%±5%
- Blinking operation priority is as follows.
1 ' HAZARD from BCM = OFF' or ' HAZARD from BCM = ON'
2 ' Hazard switch = ON'
3 ' Turn Signal LH switch = ON' or ' Turn Signal RH switch = ON'
- Double blinking by 'open load' during normal blinking starts from next period until double blinking condition is cancelled.
- Double Blinking starts by the condition below when Ign1=ON or IGN2=ON.
1 During Turn Signal LH switch = ON, Turn Signal Left Side will start double blinking when either Left Front or Left Rear Lamp is open condition.
2 During Turn Signal RH switch = ON, Turn Signal Right Side will start double blinking when either Right Front or Right Rear Lamp is open condition.
3 During Hazard switch = ON, both lamps will start double blinking when at least 3 bulbs are open condition.
- Timing Chart





Turn Signal Function By CAN
- CAN controls Turn Signal Lamp when RKE Lock/Unlock, Panic, Alarm work.
- CAN has priority to other turn signal controls apart from Ignition condition.
- When hazard from BCM is delivered, all Turn Signal Lamp control should be stopped immediately and needs to follow CAN message.
- Hazard from BCM controls all turn signal lamps.
- All turn signal lamps are turned off when 'Hazard from BCM = Inactive or OFF'. But inactive means that there's no more control from BCM not switch.
- When CAN fails, Hazard from BCM should be inactive.
- Truth Table





- Timing Chart





Hazard Function
- When Hazard Switch = ON, Left and Right side turn signal lamps should be blink apart from Ignition Switch.
- Hazard Switch has priority to Turn Signal Lever switch.
- Truth Table





- Timing Chart