HD Body Electrical. BCM's Function Comparison 1

Voltage)
Alternator “ L “ Terminal
Washer Switch
Wiper INT. Switch
Wiper INT. Volume Resistor S/W
Rear WDW. Defogger Switch
Seat Belt Switch
IGN. Key Door Warning Switch
Remote Controller Lock/Unlock Switch
Vehicle Speed Sensor
A/BAG Crash Signal (from A/BCM)
Auto light sensor
Tail Lamp Switch
Head Lamp Switch
Fog Lamp Switch
Head lamp Auto position S/W
Hood Switch
Trunk open Switch
Trunk Un Lock S/W
Passenger Central Door Lock/Unlock S/W
Driver’s Central Door Lock/Unlock S/W
All Door Switch
Passenger’s Door switch
Driver’s Door Switch
Rear Door lock/unlock S/W
Front LH/RH Door lock/unlock S/W
Front Door lock key switch

Wiper Motor Relay
Defogger Relay
Seat Belt Warning Indicator
Chime Bell
Power Window Relay
Door Lock/unlock Relay
IGN. Key Hole Illumination
Tail Lamp Relay
Head lamp relay
Room Lamp
Fog Lamp Relay
Cluster
Burglar Alarm horn relay
Burglar Alarm relay
Trunk relay
Frt. Deicer relay
Rear defogger relay
Hazard relay
2turn unlock relay

back up voltage, Ignition2 Power voltage, Ground

back up voltage, Ignition2 Power voltage, Ground

back up voltage, Ignition2 Power voltage, Ground

up voltage, Ignition Power voltage, Ground

voltage.
- 5 volts
- 12 volts

◆ In case of recognize signal using 5 volts.
1.Awareness voltage of switch are output from BCM
If switch turned ON, output voltage drop to 0 volts .
And, tail lamp relay turn "ON"
2.At this time, when switch turned ON
BCM recognizes switch signal though voltage
Are below than 1volt (Low signal)
3.If switch turned off, the voltage going up to high lever.
This time, voltage level that recognize switch off
signal is higher than 4volts.
4.Thus, the switch signal is not recognize voltage
between 1.1 volts and 3.9 volts.
◆ In case of recognize signal using 12 volts.
Extent that recognize switch's on/off signal is
- ON : lower than 4 volts
- OFF : higher than 7 volts

5 volts

Battery

Tail lamp switch

5 volts

Battery

Tail
Lamp Relay

Tail
Lamp

Door switch

Key in switch

B C M

C
P
U

and head lamp will be turned ON or OFF
automatically according to the surrounding brightness.
Auto Light function condition.
1. Ignition Key S/W “ON”
2. Light S/W “Auto Position”

Sensor

Ignition Key

B C M

C
P
U

Voltage)
Remote Controller Lock/Unlock Switch
IGN. Key Door Warning Switch
Hood Switch
Trunk open Switch
Trunk Un Lock S/W
Passenger Central Door Lock/Unlock S/W
Driver’s Central Door Lock/Unlock S/W
All Door Switch
Passenger’s Door switch
Driver’s Door Switch
Rear Door lock/unlock S/W
Front LH/RH Door lock/unlock S/W
Front Door lock key switch
Transmitter

Burglar Alarm horn relay
Burglar Alarm relay
Hazard relay
2turn unlock relay

Arm Mode entry

After
Arm Wait
(30 sec)

Arm Mode

Disarm

Transmitter
Lock Signal

Arm Wait
(30 sec)

If door open
or pressed unlock
button of transmitter
within 30 seconds

Status :
All Doors
Close

Close
or Arm Mode

Auto Lock
Timer 1

Arm Wait
(30sec)

Pressed Transmitter
Unlock Signal

Closed
Hood Open

Pre Arm

Arm Wait
(30sec)

Hood:
Close

Transmitter
Lock or Unlock
Signal

Auto lock
Timer 2

Pre Arm

Hood:
Open

: Open

Alarm

Arm Mode

TX
Lock
Signal

Disarm Mode

Arm Wait