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Uphil Profile
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Date Registered: 05-2013
Location: Ulverstone, Tas
TOTAL POSTS: 77
Reply | QUOTE
BCM, IPDM and CAN-Bus - (T31 Srs2) A Simple Explanation


For those of you who have wondered (like I have) what all the acronyms stand for and what they do........READ ON

BCM (Body Control Module)

System Description
BCM (Body Control Module) controls the operation of various electrical units installed on the vehicle.
BCM FUNCTION
BCM has a combination switch reading function for reading the operation of combination switches (light, wiper washer, turn signal) in addition to the function for controlling the operation of various electrical components. Also, it functions as an interface that receives signals from the A/C control unit, and sends signals to ECM using CAN communication.
It also activate various warning lights in the Combination Meter.

SYSTEMS CONTROLLED BY BCM DIRECTLY
Power door lock system.
Remote keyless entry system.
Power window system.
Sunroof system.
Room lamp timer.
Warning chime system.
Turn signal and hazard warning lamps system.
Front wiper and washer system.
Rear wiper and washer system.
NOTE: Power supply only. No system control.

SYSTEMS CONTROLLED BY BCM AND IPDM E/R (Intelligent Power Distribution Module – Engine Room)
Panic system.
NVIS (Nissan Vehicle Immobilizer System ) NATS (Nissan Anti-theft System)
Headlamp, tail lamp, auto light and battery saver control systems.
Front wiper and washer system.
Rear window defogger system.

CAN-Bus (Controller Area Network)

CAN-Bus, developed by Robert Bosch, is essentially a communications network for vehicles, not dissimilar to an office computer network. Most modern vehicles are fitted with 2 or more CAN-Bus backbones, to which all devices, such as ABS, Engine Management Systems and sensors, are attached. The CAN-Bus relays digital control signals to all devices, obviating the need to have every switch or control hard wired to its corresponding device via expensive wiring looms. Every device is simply attached to the CAN-Bus and power. The result is less wiring, weight and more efficiency in vehicle design and build complexity.

Hardware:
The CAN-Bus is a two wire system, not unlike the RS-485 standard which you might have at home if you use and monitor data from a Photo Voltaic inverter, such as that made by Aurora. This system is very “noise” tolerant – hence its suitability for automotive systems. Here the similarity ends and electrically looks more like the 8wire Cat5 or 6, blue cable LAN systems we see in homes and offices and uses 7 layer topology Open Systems Architecture, and Multiple Access Collision Avoidance.



There are typically 2 or 3 application-specific CAN-Bus networks on a vehicle:

High Speed CAN-Bus #1
Engine Management System, Transmission

High Speed CAN-Bus #2
SRS, ABS, TCS etc

Low Speed CAN-Bus
Doors, Climate Control, Electric Windows etc

On many modern Trucks and Buses there is an additional CAN-Bus available to the Vehicle Body Builder. This is known as the BWS or Body Workers System interface.

The BWS allows Motor Vehicle Body Builders to easily interface into relevant systems and provide data equivalent to that traditionally received via standard wiring methods, i.e. piggy backing onto existing sensors. For example, if you want information such as the engine temperature, oil pressure or whether the handbrake is engaged, you simply connect to the CAN-Bus and read the encoded signal.

I plan on doing more research into just what us users can & cannot do to systems on the CAN-Bus!

Last edited by Uphil, 7/Aug/2013, 7:24 pm


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Phil (X-3105)
Ulverstone, Tas

2009 T31 Srs 2, ST ;Nudge Bar; IPF Driving Lights; Fog Lights;Towbar
Roof Bars;Weathershield; GPS/DVD; Sony Speakers; K&N air filter; LED parkers; Cree reverse lights;Cobalt ally rims; Gas hood struts
4/Aug/2013, 5:13 pm Link to this post Send Email PM   Send Private Message
 
Revhead Kev Profile
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Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 6355
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Re: BCM, IPDM and CAN-Bus - A Simple Explanation


Many of the functions controlled by either the BCM or on CAN-bus are specific to the model of Xtrail.
An example is that the speed signal for the combination meter is on CAN-bus for the Series2 T30 and T31 but NOT for the Series1 T30.

Please when adding any future comments in this thread, be specific with which model Xtrail they reference.

---
Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
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5/Aug/2013, 10:53 am Link to this post Send Email PM   Send Private Message Blog
 
Uphil Profile
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Date Registered: 05-2013
Location: Ulverstone, Tas
TOTAL POSTS: 77
Reply | QUOTE
Re: BCM, IPDM and CAN-Bus - A Simple Explanation


Kev,

Most of the material sourced for this article is "generic" and the only two things referring to "Nissan" are the Nissan Anti Theft system and the Nissan Vehicle Immobilizer System and even those two references are Nissan generic and not model specific.

If and when I find either Nissan stuff or hopefully Exy stuff, I will indicate a model etc that it applies too.


---
Phil (X-3105)
Ulverstone, Tas

2009 T31 Srs 2, ST ;Nudge Bar; IPF Driving Lights; Fog Lights;Towbar
Roof Bars;Weathershield; GPS/DVD; Sony Speakers; K&N air filter; LED parkers; Cree reverse lights;Cobalt ally rims; Gas hood struts
5/Aug/2013, 11:06 am Link to this post Send Email PM   Send Private Message
 
Revhead Kev Profile
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Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 6355
Reply | QUOTE
Re: BCM, IPDM and CAN-Bus - A Simple Explanation


You missed my point Phil.
You have to state the model of Xtrail you are referring to when you post information like this or it can be confusing to other members.
For example
1. Any member owning a T30 Series1 would have trouble finding a BCM...it is referred to as a Time Control Unit.
2. They would also find that the wipers are not controlled by this, rather a separate "Wiper Amp" module.
3. The sunroof in a T30 Series1 has its own control module also with no connections to a BCM or the Time Control Module.

Maybe instead of saying "Systems Controlled by" you might like to have "Systems which may be Controlled by" as it is only generic information you have posted and not necessarily applicable to all Xtrails.

Last edited by Revhead Kev, 5/Aug/2013, 1:29 pm


---
Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
My Blog
My CarPC Worklog
5/Aug/2013, 1:23 pm Link to this post Send Email PM   Send Private Message Blog
 


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