How to: Install DIC in gmt400 overhead console

[1997chevydriver]

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

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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.

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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.

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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)

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I tested the DIC before the temp sensor and the class 2 serial wire was hooked up thats why it reads (--)

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I put a piece of wire loom over the temp sensor so it wasn't easily seen behind the grill

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

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

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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.

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This is the only in operation pic I have

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[Rewind]

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

 

[1997chevydriver]

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.

 

[monstar_est87]

Thats bad ass man nice work...

 

[1997chevydriver]

Thank you. But I will not take full credit I got the idea from here---------> http://gmtruckcentral.com/articles/GMT400DIC.html

 

[the big blue bus]

thats cool kind wish my switches werent there or id get one of those

 

[1997chevydriver]

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

 

[Rewind]

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

 

[Devs93]

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

 

[1997chevydriver]

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

I think its 98-02??