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Thread: Motorola XOOM - 2003 Jeep Grand Cherokee 4x4

  1. #41
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    Mar 2013
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    I'm using a canbus shield from sparkfun. I could be wrong, but I've been under the impression that the ELM devices wouldn't work for talking to the comfort bus. I have a bluetooth ELM around here somewhere, maybe I should dig it out and play around with it. I've got the Arduino mostly working, so I'll probably just stick with that regardless.

  2. #42
    Constant Bitrate
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    Sep 2009
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    Quote Originally Posted by bdr529 View Post
    I'm using a canbus shield from sparkfun. I could be wrong, but I've been under the impression that the ELM devices wouldn't work for talking to the comfort bus. I have a bluetooth ELM around here somewhere, maybe I should dig it out and play around with it. I've got the Arduino mostly working, so I'll probably just stick with that regardless.
    yeah go with whatever works for you! i had looked into that shield myself before i went down this road. i still will probably add an Arduino at some point to interface with some sensors.

    FYI, depending on the vehicle you might would have to wire in the ELM-based scantool directly to the right bus. but as long as the bus protocol is one of the standard OBDII ones, then it would work with that non-OBDII bus too. on my particular year of Jeep, all the busses talk to each other over the SAE-1850 VPW protocol (pin 2 on the OBD port). however, as a gotcha, certain year Jeep/Chrysler/Dodge vehicles (mine included) support 2 different OBDII protocols. so i had to set my scantool specifically to work on the 1850 bus - otherwise it was defaulting to the ISO 9141-2 (pin 7) bus which is ONLY for OBDII info and does not connect to the other bus systems. my understanding is that on the newer Jeep/Chrysler/Dodge everything is standardized to the CAN-BUS protocol.

    if you do play with the scan tool, use a serial terminal program to set the protocol to CAN-BUS, then set the headers on (ATH1), and line-breaks on (ATL1), then you can do a monitor all (ATMA) and watch all the traffic on the bus (probably capture it to a file, it flies by fast). there's way less traffic with the vehicle not running so you're more likely to spot what msgs correspond to what you are testing for (like door lock, steering wheel buttons, etc). of course if you already have the msg definitions for what you need to monitor/control then you're way ahead of where i was at first!

    here's a link to the standard ELM AT command set: http://elmelectronics.com/ELM327/AT_Commands.pdf
    Last edited by theksmith; 03-10-2013 at 05:30 PM.

  3. #43
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    Sep 2009
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    steering wheel buttons all working:


  4. #44
    Low Bitrate
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    Feb 2012
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    66
    Sweet! I need to see if this will work in my 04 maxima. I have a nexus 7 and Xoom so I wonder if it works similarly.

    Sent from my Nexus 7 using Tapatalk 2

  5. #45
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    Sep 2009
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    someone on another forum asked me "Which apps do you feel are necessary on a Jeep mounted tablet? Which are you running?"

    Mapping apps...
    - Google Maps (street, online)
    - CoPilot Live (street, offline)
    - Backcountry Navigator (topo/satellite, offline)
    - OruxMaps (topo/satellite, offline), better in some ways than BCN but has limitation on size of downloaded area currently

    An OBDII app...
    - I use TouchScan, Torque is more popular

    Viewer apps...
    - a general document viewer for excel/word/etc like OfficeSuite Viewer (i have a list of OBDII codes in excel format)
    - Adobe Reader for a copy of the factory service manual

    Lux (lets you set the screen backlight much dimmer than normal for night time use, not necessary if you have certain custom ROMS though)

    An automation app...
    - these sort of apps let you do basic stuff like tell the tablet to go into airplane mode to save power when external power is disconnected, or advanced stuff like start an FTP server when your near your house based on which cell tower it sees.
    - Tasker rocks, but it's got a steep learning curve
    - AutomateIt has a much cleaner UI, but i've not used it personally
    - llama is a popular free one, but a bit limited

    A media player app...
    - I'm using "PlayerPro Music Player" with the Holo ICS skin, works for music and video

    Streaming media apps (if you have a 3G/4G connection or can tether to your phone)...
    - Pandora/LastFM/Spotify/Etc.
    - Youtube/Hulu Plus/Netflix

    Weather apps (if you have a 3G/4G connection or can tether to your phone)...
    - i'm using HD Widgets
    - i also have Weatherbug Elite for more detail

    Some basics...
    - a file manager, i like ES File Explorer better than ASTRO
    - a backup app like Titanium Backup (not only making it easy to backup the entire config of the tablet, but also can get rid of annoying built-in apps from the phone company)
    - maybe a task manager, but i rarely need it - depends on the device and the version of Android

    i consider root access to be a minimum personally so i can do whatever the frig i want with it, but you don't NEED it. i actually like to run a custom ROM too, but that's definitely not needed.

    in addition to all the above apps, i have my custom app for interfacing with the steering wheel buttons. i've also done a lot of customization with Tasker. finally, since i have root and am messing with behind-the-scenes stuff, i have SuperSU and Better Terminal Pro.
    what must-haves did i miss?

  6. #46
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    Join Date
    Apr 2011
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    I am super impressed with the build - awesome of you to keep such a detailed log, lots of good info for getting my own Xoom mounted in my cruiser which I have been meaning to do for months. One thing which I don't see on your setup is integrating an FM tuner - I have been looking at the Visteon HD Radio and then later possibly programming a widget to control it within android - this site has some good info on it which doesn't look too complicated http://www2.dasilvas.info/hd-radio

    I am also keen to interface to an arduno board which can monitor voltage on my split charge (& solar to come) systems and other bits and pieces in the vehicle - there is a lot of info on this around luckily.

    I am busy putting together my shopping list, but I live in South Africa so might have to substitute what I can get on this end..

  7. #47
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    Sep 2009
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    hey there and thanks!

    i didn't worry about FM radio only because i never listen to it - too many commercials! since i live in the city and have 4G coverage, i just use Pandora.

    that HD-Radio looks nice, it's awesome that it has a pretty straightforward interface to hack on.

    post up a link to your build thread if you do one...

  8. #48
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    Mar 2013
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    This is one sweet implementation. I'm not an Android fan but you go. Very nice.
    piercedmikey likes this.

  9. #49
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    Join Date
    Feb 2008
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    5
    Quote Originally Posted by theksmith View Post
    ...

    FYI, depending on the vehicle you might would have to wire in the ELM-based scantool directly to the right bus. but as long as the bus protocol is one of the standard OBDII ones, then it would work with that non-OBDII bus too. on my particular year of Jeep, all the busses talk to each other over the SAE-1850 VPW protocol (pin 2 on the OBD port). however, as a gotcha, certain year Jeep/Chrysler/Dodge vehicles (mine included) support 2 different OBDII protocols. so i had to set my scantool specifically to work on the 1850 bus - otherwise it was defaulting to the ISO 9141-2 (pin 7) bus which is ONLY for OBDII info and does not connect to the other bus systems. my understanding is that on the newer Jeep/Chrysler/Dodge everything is standardized to the CAN-BUS protocol.

    if you do play with the scan tool, use a serial terminal program to set the protocol to CAN-BUS, then set the headers on (ATH1), and line-breaks on (ATL1), then you can do a monitor all (ATMA) and watch all the traffic on the bus (probably capture it to a file, it flies by fast). there's way less traffic with the vehicle not running so you're more likely to spot what msgs correspond to what you are testing for (like door lock, steering wheel buttons, etc). of course if you already have the msg definitions for what you need to monitor/control then you're way ahead of where i was at first!

    ...
    Hi,
    Well, I've a cheap *BT* obdii adapater, a Xoom and a WJ WG CRD 2004 - which should be as close as possible to your car.

    I wish to connect the obdii and listen to pci - could u give me a short cook book for this? things like what android scan app which works fine with BT and how i configure it to 1850 bus...

    I would prefer using the Android but if you have a solution for linux host - that would be fine as well, this way i can verify the BT obdii capablities.

    btw - we "met" before on jeepforum.com :-)
    10x
    Rabin

  10. #50
    Constant Bitrate
    Join Date
    Sep 2009
    Posts
    166
    having learned a lot while working on this project, i wrote a 2-part article on hacking your vehicle bus to help out others:

    http://www.mp3car.com/engine-managem...hicle-bus.html

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