Hyundai Elantra HD: Body Control Module (BCM). Repair procedures - BCM (Body Control Module) - Body Electrical System - Hyundai Elantra HD 2006–2010 Service ManualHyundai Elantra HD: 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)

Body Control Module (BCM). Description and Operation
Description Body control module (A) receives various input switch signals controlling time and alarm functions for tail lamp, rear fog lamp, wiper control, buzzer warning, fron ...