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Data Bus on a 2003 Ram

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gokeeper 
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Member spacespace
Joined: December 24, 2003
Location: United States
Posted: April 02, 2004 at 12:09 AM / IP Logged  

I am considering trying a data bus on my 03 ram my personal truck to if nothign else get familure with the data bus. My question is since this data bus controls the door locks will it activate the dome light or will i have to pull that from somewhere else I'm not sure since the factory uses the dome light if the data bus unlocking the doors will trigger this. I know this data bus doesnt support dome light supervision but will the truck?

auex 
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Posted: April 02, 2004 at 4:03 PM / IP Logged  
Who said that dodge rams are databus? They have multiplexed circuits but no databus, at least as far as I am aware.
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JWorm 
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Posted: April 03, 2004 at 12:46 AM / IP Logged  
Bypasskit.com sells many databus doorlock modules for Chrsylers, including the Ram. I've never used one, but have seen them on their website. They usually do turn on the domelight, but not sure about your vehicle.
Mad Scientists 
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Posted: April 03, 2004 at 9:53 AM / IP Logged  

auex wrote:
Who said that dodge rams are databus? They have multiplexed circuits but no databus, at least as far as I am aware.

 What do you consider the differences between multiplexing and a databus to be?

 Regards,

 Jim

auex 
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Posted: April 03, 2004 at 11:27 AM / IP Logged  
Well, I would consider multiplexed system as a system that uses 1 wire to control 1 circuit such as lights or locks on the dodge in question, which also works on resistance. Databus would be 1 wire that controlled multiple circuits such as new gm trucks, these work on specific voltages and timed pulses.
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Always check info with a digital multimeter.
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Mad Scientists 
Silver - Posts: 380
Silver spacespace
Joined: February 07, 2004
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Posted: April 04, 2004 at 5:43 PM / IP Logged  

auex wrote:
Well, I would consider multiplexed system as a system that uses 1 wire to control 1 circuit such as lights or locks on the dodge in question, which also works on resistance. Databus would be 1 wire that controlled multiple circuits such as new gm trucks, these work on specific voltages and timed pulses.

 The way I look at it is that multiplexing is a method of sending signals on a data bus. Not a great way to explain it. though.. sorry.

This is better.

"The time-triggered CAN (TTCAN) standard is an extension of the CAN protocol. It adds a session layer on top of the existing data link layer and physical layers to ensure that all transmission deadlines are met, even at peak bus loads. The protocol implements a hybrid, time-triggered, TDMA (time-division multiplexed access) schedule that also accommodates event-triggered communications. Some of the intended TTCAN uses include engine management systems and transmission and chassis controls, with scope for by-wire applications. "

http://www.xilinx.com/publications/xcellonline/xcell_48/xc_autobus48.htm

 Interesting article on automotive data bus systems..

 Mopar has been real big on using data buses and Body Control Modules.. I can use a automotive scan tool (Snap-On Modis) and while standing outside the car activate wipers, headlights, engine cooling fans, warning chimes, door locks, and I can't remember all what else..

 Neat stuff, but about 6 months ago I traveled to a local Chrysler dealer to consult on a electrical problem they were having on a late model Chrysler minivan. The dealer ended up replacing the BCM, Transmission Control Module, engine wiring harness, dashboard wiring harness, fusebox, and dashboard PCB. The bill ended up being close to $4k. The vehicle had been involved in a front collision which affected the CAN bus twisted pair wires..

 Neat stuff, but expensive to fix.

 regards,

 Jim


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