Hyundai Elantra: Body Control Module (BCM). Repair procedures - BCM (Body Control Module) - Body Electrical System - Hyundai Elantra HD 2006Ц2010 Service ManualHyundai Elantra: Body Control Module (BCM). Repair procedures


Removal

1.
Disconnect the negative (-) battery terminal.
2.
Remove the center facia lower panel with ashtray. Avoid damaging retaining clip.
3.
Remove the body control module (A) after loosening 2 nuts and disconnecting connector.


Installation

1.
Install the body control module.
2.
Install the center facia lower panel.

Inspection

BCM Connectors

Pin No.
Connector A
Connector B
Connector C
1
Battery Voltage
Driver Door Key Lock SW
Room Lamp
2
IGN1
Driver Door Key Unlock SW
-
3
Alternator'L'
Power Window Door Lock SW
DEFOGGER RELAY
4
Key In Switch
Tail Lamp SW
Tail Lamp Relay
5
-
INT Wiper Volume SW
Wiper Relay
6
Over Speed
Speed Light SW
Lock Relay
7
Carsh Input
-
-
8
Driver Door Unlock SW
Seat Belt SW
Horn Relay
9
Assist Door Unlock SW
Head Lamp SW
Hazard Relay
10
Rear Door Unlock SW
Assist Door Key Unlock SW
Key Illumination Lamp
11
-
Power Window Door Unlock SW
Seat Belt Indicator
12
Ground
Trunk Key Unlock SW
Ground (Power)
13
IGN2
Trunk Release SW
-
14
Washer SW
-
-
15
INT Wiper SW
-
Safety Power Window ECU
16
Code Save Unit
-
Power Window Relay
17
-
Front Deicer SW
Front Deicer Relay
18
-
Rear Defogger SW
Head Lamp Relay
19
Mist SW
-
Unlock Relay
20
Driver Door SW
Front Fog Lamp SW
-
21
Assist Door SW

Trunk Release Relay
22
4 Door SW

Start Inhibitor Relay
23
Trunk Open SW

-
24
Hood SW

Hi-scan

BCM Input/output Specification
No
Input Signal Name
ON/OFF Voltage Level(v)
A1
B+
9V ~ 16V
A2
IGN 1
OVER 7V / BELOW 4V
A3
ALT 'L'
OVER 7V / BELOW 4V
A4
Key In SW
OVER 7V / BELOW 4V
A7
Crash Input
BELOW 1V / OPEN
(Reference Value : OVER 4V)
A8
Driver Door Unlock SW
BELOW 1V / OPEN
(Reference Value : OVER 4V)
A9
Assist Door Unlock SW
BELOW 1V / OPEN
(Reference Value : OVER 4V)
A13
IGN 2
OVER 7V / BELOW 4V
A14
Washer SW
OVER 7V / BELOW 4V
A15
Wiper INT SW
OVER 7V / BELOW 4V
A16
Code Save Unit
BELOW 1V / OVER 4V
A19
Mist SW
OVER 7V / BELOW 4V
A20
Driver Door SW
BELOW 1V / OPEN
(Reference Value : OVER 4V)
A21
Assist Door SW
BELOW 1V / OPEN
(Reference Value : OVER 4V)
A22
4Door SW
BELOW 1V / OPEN
(Reference Value : OVER 4V)
A23
Trunk SW
BELOW 1V / OPEN
(Reference Value : OVER 4V)
A24
Hood SW
BELOW 1V / OPEN
(Reference Value : OVER 4V)
B1
Driver Door Key Lock SW
BELOW 1V / OPEN
(Reference Value : OVER 4V)
B2
Driver Door Key Unlock SW
BELOW 1V / OPEN
(Reference Value : OVER 4V)
B3
Power Window Door Lock SW
BELOW 1V / OPEN
(Reference Value : OVER 4V)
B4
Tail SW
BELOW 1V / OPEN
(Reference Value : OVER 4V)
B5
Wiper Int Volume SW
-
B6
Speed Sensor
BELOW 1V / OVER 4V
B8
Seat Belt SW
BELOW 1V / OPEN
(Reference Value : OVER 4V)
B9
Head Lamp SW
BELOW 1V / OPEN
(Reference Value : OVER 4V)
B10
Assist Door Key Unlock SW
BELOW 1V / OPEN
(Reference Value : OVER 4V)
B11
Ppower Window Door Unlock SW
BELOW 1V / OPEN
(Reference Value : OVER 4V)
B12
Trunk Lid Unlock SW
BELOW 1V / OPEN
(Reference Value : OVER 4V)
B13
Trunk Release SW
BELOW 1V / OPEN
(Reference Value : OVER 4V)
B18
Rear Defogger SW
BELOW 1V / OPEN
(Reference Value : OVER 4V)
B20
Front Fog SW
BELOW 1V / OPEN
(Reference Value : OVER 4V)

BCM Actuator Operation
SCAN tool can operates all actuators controlled by BCM by force.
No.
BCM Display
1
Door Lock Relay
2
Door Unlock Relay
3
Driver Door Unlock Relay
4
Power Window Relay
5
Wiper Relay
6
Hazard Relay (+RK)
7
Burglar Horn Relay (+RK)
8
Starter Inhibit Relay (+RK)
9
Tail Lamp Relay/drl Unit
10
Head Lamp Relay
11
-
12
Rear Defogger Relay
13
Driver Seat Belt Indicator
14
Security Indicator (+RK)
15
Ign Key Hole Illumination
16
Chime Buzzer (Door Warning)
17
Room Lamp
18
H/lamp Washer Relay

BCM Diagnosis With Scan Tool
1.
It will be able to diagnose defects of BCM with scan tool quickly. Scan tool can operates actuator forcefully, input/output value monitoring and self diagnosis.
2.
Select model and menu.

3.
Select "Current data", if you will check current data of BCM. It provides power supply status, multi function status, lamp status, door status, lock system status, wiper, auto light status and so on.

4.
If you will check BCM data operation forcefully, select "Actuation test".

5.
You can turn ON/OFF as below option function with the user option program.
(1)
LOCK / UNLOCK comfirming alarm: Alarm sound ON/OFF control when you LOCK/UNLOCK doors with transmitter.
(2)
Mechanical LOCKING system: Arm/Disarm ON/OFF when you lock the door with the mechanical key.
(3)
AUTO DOOR LOCK/UNLOCK system ON/OFF.
A.
Vehicle speed gearing AUTO DOOR LOCK (more than 20km/h)
B.
AUTO DOOR LOCK non application
C.
Shift lever gearing AUTO DOOR LOCK
D.
Driver seat AUTO DOOR LOCK
E.
AUTO DOOR UNLOCK non application
F.
All doors UNLOCK in the case of driver door UNLOCK
G.
All doors UNLOCK in the case of IGN key seperation.
(4)
Riding & Getting off gearing
A.
Seat installation state ON/OFF
B.
Seat riding & getting off gearing ON/OFF
C.
Column installation state ON/OFF
D.
Column riding & getting off gearing ON/OFF
User Option Mode
The BCM offers 4 items user option mode for a user convenience (AUTO DOOR LOCK, ARM/DISARM BY KEY, HORN ANSWER BACK)
-
It is able to set up the enable or disable of AUTO DOOR LOCK function or AUTO DOOR LOCK operation vehicle speed when using it.
-
It is able to set up the enable or disable of enter the burglar alarm mode when using door lock by the key.
-
It is able to set up the enable or disable of horn inform function when using door lock by the key or RKE.
-
It is able to set up the enable or disable of auto light control function when using auto light control.
1.
Select option "ELANTRA (HD)" and press ENTER.
2.
Select option "BODY CONTROL MODULE" and press ENTER.

3.
Select option "USER OPTION" and press ENTER.

4.
Select option "AUTO DOOR LOCK STATUS by using the direction button(▲ / ▼).
5.
Select the parameter by using the direction button(◀ / ▶) and press ENTER to save it.
(Disable / 5km/h / 10km/h / 15km/h / 20km/h / 25km/h /30km/h / 35km/h / 40km/h)

6.
Select option "ARM/DISARM BY KEY(+RKE)" by using the direction button(▲ / ▼).
7.
Select the parameter by using the direction button(◀ / ▶) and press ENTER to save it.
(Disable / Enable)
8.
Select option "HORN ANSWER BACK (+RK)" by using the direction button(▲ / ▼).
9.
Select the parameter by using the direction button (▲ / ▼) and press ENTER to save it (Disable/Enable)

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