How to: Install DIC in gmt400 overhead console

Discussion in 'OEM and Custom Interiors' started by 1997chevydriver, Feb 2, 2012.

  1. 1997chevydriver

    1997chevydriver OBS MAGIC!!

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    WE HAVE COME TO THE CONCLUSION THIS DOES NOT WORK ON DEISELS

    What you need.
    -DIC out of a blazer, a long console DIC has the compass built in
    -wire of your choice (I used 6 conductor phone wire)
    -temp sensor
    -I used 7 feet of wire from DIC to Radio I would suggest using about 8 feet
    -9 feet of wire to the temp sensor


    Ok here is how I did it.

    I started by removing the screw on the front of the OHC so I could slide it forward to release it from the roof
    DSC00394.jpg
    then unplugged the connector for the lights.

    I then had to make my own wireing harness for it because I did not want to even try to get the factory one from the blazer.
    DSC00405.jpg
    If you make your own harness make sure you take notes as to what wire colors go where.
    I soldered all of my connections but if you don't know how or are no good at it you can use crimp conectors , but you have to make sure your connections are flawless.

    Then take the dash panel off so you have acesss to the radio wires, and remove your radio.
    DSC00400.jpg

    I ran the wire on top of the headliner and down the drivers side A-piller into the dash by the headlight switch under the cluster and then to the radio(most of your wires will be here.
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    The wires you need at the radio are as follows
    Pin #6 ppl/white------>LED dimmer
    #11 grey------>Illumination circut power
    #9 drk green---------> RAP fuse supply
    #16 drk green/white ---------->VSS


    I used the power and ground from the lights in the OHC.

    The only wire needed out of the cab is the signal wire for the temp sensor. (lt. green/black)
    DSC00423.jpg

    I tested the DIC before the temp sensor and the class 2 serial wire was hooked up thats why it reads (--)
    DSC00412.jpg
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    I put a piece of wire loom over the temp sensor so it wasn't easily seen behind the grill
    DSC00435.jpg

    This is where I mounted the temp sensor using the factory clip from the blazer
    DSC00436.jpg

    And this is where you hook up to the class 2 serial data
    DSC00421.jpg

    Some finished pics.

    Compass was not calibrated yet

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    I have not figured out why the range mode always reads Lo

    EDIT: I found out that for the RANGE mode to work the fuel level sender has to run thru the computer (96-97 does not) 98+ does.

    DSC00429.jpg
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    This is the only in operation pic I have
    2.jpg

    DICconnector3.jpg
    DICconnector.jpg

    DICconnector4.jpg
    DICconnector2.jpg
     
    Last edited: Apr 5, 2012
    Pychokenny, GMCTRUCKS and Devs93 like this.
  2. Rewind

    Rewind STEPSIDES ROCK!!!!

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    Great write-up!!! If you come across another DIC let me know.
     
  3. 1997chevydriver

    1997chevydriver OBS MAGIC!!

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    Actually I have one but I need to get a wiring plug in for it. Who ever took the OHC out of the blazer left the DIC but removed the harness for it and the OHC.
     
  4. monstar_est87

    monstar_est87 I'm Awesome

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    Thats bad ass man nice work...
     
  5. 1997chevydriver

    1997chevydriver OBS MAGIC!!

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    GMCTRUCKS likes this.
  6. the big blue bus

    the big blue bus I'm Awesome

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    thats cool kind wish my switches werent there or id get one of those
     
  7. 1997chevydriver

    1997chevydriver OBS MAGIC!!

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    I also forgot to add that the compass/temp DIC will work on OBD I & II, the DIC that has compass/temp/ave mpg/instant mpg/range/and average speed will only work on OBD II
     
  8. Rewind

    Rewind STEPSIDES ROCK!!!!

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    What year blazer's do you have to look for one of these in?
     
  9. Devs93

    Devs93 OBS 4 EVA Staff Member

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    great write up the pic a part here has tons of the dic's in it
     
  10. 1997chevydriver

    1997chevydriver OBS MAGIC!!

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    I think its 98-02??
     

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