Help Trip Computer question.

[ditch]

I need to wait a little while to do this mod. There is plenty of info. here on installation. The only problem is I bought it on e-bay and want to verify it at least works.

e-bay

JP customs sold me the wire Harness and very detailed instructions for installation. I have e-mailed him but don't expect a response til sometime Monday.

I have tried to verify it will at least light up the display by connecting Pos. (Red wire) and Neg (Black wire) didn't work. I then looked at the wiring diagram and noticed the pink wire was for an internal relay. I tied it together with the Red wire and still nothing!

Does anybody have any ideas?

Ditch

 

[ditch]

Well "F" me with no response.

 

[ShapeShifter]

Well "F" me with no response.

Well, you have a tough question, and maybe nobody has any experience with it. Me, I'm drawing a total blank.

It appears you have an '02. I have been looking in my '02 service manual, but I cannot find any information on the trip computer. So far, in the instrument panel chapter, I have seen one reference to it: in a diagram that shows class 2 serial data going to the nav system/trip computer. But it is not referenced in the index, nor in the table of contents, and that volume of the service manual has over 1,800 pages, which is a bit much to browse blindly.

There was a thread a while back where a few people had tried getting a couple of different trip computers working, with mixed results. Have you tried contacting those people to see if they have any tips or ideas?

JP Customs is normally very responsive, I'm sure you'll get a helpful response from him.

Good luck!

-- SS

 

[sperry]

Looks too "early" for my 2?
Is it pre-`02?

 

[ditch]

Well, you have a tough question, and maybe nobody has any experience with it. Me, I'm drawing a total blank.

It appears you have an '02. I have been looking in my '02 service manual, but I cannot find any information on the trip computer. So far, in the instrument panel chapter, I have seen one reference to it: in a diagram that shows class 2 serial data going to the nav system/trip computer. But it is not referenced in the index, nor in the table of contents, and that volume of the service manual has over 1,800 pages, which is a bit much to browse blindly.

There was a thread a while back where a few people had tried getting a couple of different trip computers working, with mixed results. Have you tried contacting those people to see if they have any tips or ideas?

JP Customs is normally very responsive, I'm sure you'll get a helpful response from him.

Good luck!

-- SS

I did pm a couple of people, but no responses. I e-mailed Jason Late Fri. night, but still haven;t heard anything.

I just can't understand why I would'nt be able to just hook it up to power to just get the display to light up?

Ditch

 

[ditch]

Looks too "early" for my 2?
Is it pre-`02?

It's an 02' like shapeshifter was saying there have been mods done. And I was using the info. in the other threads on it. The Information Jason had sent with the wire harness shows the oni configuration but I have no idea why I'm not getting power.

Ditch

 

[MrFleming007]

Looking at it, thats definatly the trip computer out of an '02 denali or escalade. I'm not going to be much help to you, other than saying this is one of the mods I'm going to be doing in the future too. Its possible that it might have to recieve a signal in order to display something What I'm getting at here is that perhaps by powering the unit all your actually doing is applying power to the brain inside the unit and it won't actualy display anything until is HAS something to display Just my .02, and its very possible that I'm wrong.

I too want this mod- I think I'm going to modify my upper center console pocket to fit the trip computer. Saw it done on a Silverado and a EXT so far, it is looks SWEET Good luckwith yours- provided its a working piece you got a great deal on it!

 

[RENORCR]

Well "F" me with no response.

Ditch,
You just have a stumper of a question. There's Techie's out here, just need more info.
You mention you got instructions from Jason. What are the wiring configuation in the instructions vs. number of color wires out of unit. Also, maybe different setup between AV and Denali/Escalade. You just have a stumper of a question.

 

[ditch]

What are the wiring configuation in the instructions vs. number of color wires out of unit. Also, maybe different setup between AV and Denali/Escalade.

Just looked at the wiring:

Pink- Ignition(Power when the key is in the "on" position)

Purple- Class 2 Serial Data

Gray- Dimming circuit

Orange/Red- Battery positive

White- Speed Sensor

Green- RAP Voltage

Black- Ground


I have no idea what RAP Voltage is.

 

[RichUF]

RAP = Retained Accessory Power (I think), but I've no idea how to help you otherwise

 

[RENORCR]

Ditch,

RAP = Retained Accessory Power

Just looking at your list. I can guess maybe why it didn't light up. Simple test: Pink & Red are 12v; Pink is the on/off switch. Since you hookup Red & Black and nothing happen, because Pink triggers the On power.

RAP is use when you turn off your vehicle remove key, you have 20 mins of use before it turns off or a door opens, just like radio. Gray - self explaining. Purple & White is what makes the computer, compute.

Hope that helps.

 

[ditch]

Ditch,

RAP = Retained Accessory Power

Just looking at your list. I can guess maybe why it didn't light up. Simple test: Pink & Red are 12v; Pink is the on/off switch. Since you hookup Red & Black and nothing happen, because Pink triggers the On power.

RAP is use when you turn off your vehicle remove key, you have 20 mins of use before it turns off or a door opens, just like radio. Gray - self explaining. Purple & White is what makes the computer, compute.

Hope that helps.

I have tried Tieing the Pink and Red wire together. (And of course Black to GND)
But still get nothing.

Do you think the Green wire (RAP Voltage) also needs to be tied up with the Red and Pink wires?

Ditch

 

[ShapeShifter]

Just looked at the wiring:

Pink- Ignition(Power when the key is in the "on" position)
Purple- Class 2 Serial Data
Gray- Dimming circuit
Orange/Red- Battery positive
White- Speed Sensor
Green- RAP Voltage
Black- Ground

I have no idea what RAP Voltage is.

As others have said, RAP is the switched ignition source that stays on for a few minutes after you shut off the ignition, and until you open a door. The radio is controlled by the RAP voltage.

To get it to turn on, I would think that you need black connected to ground, orange/red, pink, and green connected to +12V. That should at least get the display to light up.

What I don't understand is why they have an ignition circuit and an RAP circuit. It seems to me that the ignition circuit would be redundant. All I can think is that they want the display to stay active as long as the RAP is active, but they want now when the ignition is on or off (maybe to calculate average speed or travel time?) Actually, if that is the case, connecting the orange/red and green wires to +12V should probably be enough just to see if it functions at all.

-- SS

 

[ditch]

To get it to turn on, I would think that you need black connected to ground, orange/red, pink, and green connected to +12V. That should at least get the display to light up.

-- SS

So the Green wire should be 12V? I was thinking the same thing but was afraid to try it.
I thought there might be a slim chance that it was a lower V and I might fry it.

The radio is controlled by the RAP voltage.

-- SS

This is another thing I'll be worried about later during installation. I had a local chain store install my stereo. I haven't had a chance to remove it yet to see if they did a crappy job and cut out the wiring harness.

I'm at work right now. I'll try to see if the three wires tied together works.

Thanks Shapeshifter and RENORCR.

 

[ditch]

HOORAY!!!!

It works!

Tied all three wires (Red, Pink, and Green) together and Black to GND.

The Faceplate lit-up and then showed a date of: Jan. 1, 1998 (Must be set manually set I guess)

I'm stoked!

Thanks again, Shapeshifter and RENORCR.


Sean

 

[RENORCR]

Ditch,

Glad to hear it worked!

Now be sure to take pictures & post, when you do your mod.

Have Fun!

 

[ditch]

Just got it installed.
It lights up, but the only reading I get is AVG MPG = 12.9

No other reading is coming thru.

I'll see if I can check the purple wire tommorrow.

And,

I still need to get a face plate.

 

[ditch]

AAAGGGHHHHH!!!!!!

I had to drive to work today, as soon as I started up the truck the display didn't light up.

Damn!

I gonna have to pull everything out again and check all of my splices.

I'm not off from work again til Thur. and I won't be able to check it til then!

 

[ditch]

Does anyone know if this is correct?

Purple- Class 2 Serial Data (Connected at computer plug just left of driver's knee, to the purple wire.)

Ditch

 

[RENORCR]

Ditch,

Going to have to look at my connectors. There are two connectors at that location out of six total. The two plugs in question have a purple wire. One is the DRL Off indicator Control, the other is for Interior Lamp defeat Switch.

The Class 2 Serial Data is a Yellow Wire on a 03' Model. It's on the third Connector from the left.
Connector 1 is a 6 Wire Plug.
Connector 2 is a 24 Wire Plug
Connector 3 ia a 24 Wire Plug
The Yellow is next to a Gray/Black on the lower row.
The row above these wires, should not be occupy by wires.

I plan on opening and taking photos of this area Saturday for modding.

Hope this helps.

 

[ShapeShifter]

Does anyone know if this is correct?

Purple- Class 2 Serial Data (Connected at computer plug just left of driver's knee, to the purple wire.)

It appears to be correct.

Down below the dash, near the driver's knees, is the Data Link Connector (DLC) used for diagnostics. (Note that this is not the same as the three connectors that go to the Body Control Mocule (BCM) which is under the steering wheel behind the lower trim panel. I think RENORCR might be referring to these connectors.)

On an '02 model truck, this is a 16 pin connector (two horizontal rows with eight cavities each) but only four of these cavities are actually used:

Pin	Color	Function
1	--	Not Used
2	Purple	DLC Class 2 Serial Data
3	--	Not Used
4	Black	Ground
5	Black/White	Ground
6-15	--	Not Used
16	Orange	Battery Positive Voltage

The question that remains is if this is the same serial data bus that goes to the trip computer. I don't know if there is more than one bus on the vehicle. From the page of the shop manual that shows the above data link connector, it shows that the serial data bus at this point is also connected to the following subsystems:

• Driver Information Center (DIC)
• Memory Seat Module (MSM)
• Theft Deterrent Control Module
• Powertrain Control Module (PCM]
• Body Control Module (BCM)
• Electronic Brake Control Module (EBCM)
• Inflatable Restraint Sensing and Diagnostic Module (SDM)
• Suspension Control Module
• Memory Mirror Module (MMM)
• Transfer Case Shift Control Module
• Vehicle Interface Unit (VIU)
• Instrument Panel Cluster (IPC)
• Data Link Connector (DLC)
• HVAC Control Module

So, while it does not specifically list the trip computer, it seems to go just about everywhere, so it is likely that this is indeed the wire you seek. (Note that while all of these units are connected together with a common data bus, there does appear to be another connection that goes from the PCM to either the BCM or theft deterrent control module depending on the presence or absence of option AU8, which is identified only as "Remote Function Acutation, Specific Frequency." What is that, remote keyless entry?)

Never having heard of a DIC on an '02 before (I thought it was a new feature introduced in '03) I did some digging. It appears to be a unit that goes in the lower console (where we have a storage cubby and CD storage door) and it has a display with "Fuel", "Trip", "On/Off", "Reset", ">", and "Menu" buttons. In other words, it looks just like the picture in your eBay link.

So, given all that, I am rather confident in saying that the purple wire in the data link connector by the driver's knees is indeed the class 2 serial data line that you want to tap.

Now that I know I am looking for "DIC" and not "trip computer" I have finally found the schematics for the unit. Maybe later tonight I will have a chance to scan a couple pages of the shop manual and send them to you.

-- SS

 

[RENORCR]

Thanks, ShapeShifter for the correction.

I was talking about the BCM and it probably is not the correct wire.

 

[ditch]

I appreciate all the help.

The only thing I can think of is that my splice on the purple wire (at the diag. connector) is not making contact.

I have a break in about an hour, I'm going to go check then. Once I do that, and confirm ALL of the splices are good on Thursday. (At the back of the stereo system.) The only other thing I could think of is that the unit is defective.


Ditch

 

[half-breed]

Here is a link to the original posts http://www.chevyavalanchefanclub.com/cafcna/index.php?board=118;action=display;threadid=6510;start=msg94882#msg94882.

The serial bus goes everywhere, I taped into the purple wire at the data link connector, mounted to the bottom of the dash just above the drivers left knee,

I looked at the Avalanche and the wiring diagrams. If it is the data bus you are looking for (part of Splice Pack SP205 on the Av) it connects to a purple (PPL) wire on the Data Link Connector (DLC, the one below the dash, just above the driver's left knee), pin 2 on this connector. That is where I tapped into it. This wire goes to just about all of the vehicle computers, but I figured it was easiest to get to here, and if the splice ever broke the wire open the only effect on the vehicle would be that the service connector would not work properly for a service tech. It is secured to the bottom of the dash with one screw, so it was easy to drop and tap into the wire. Keep in mind that my vehicle is a 2002 Avalanche.

My install in the CD storage door:

Carrierdealer's install in the overhead console:

 

[ditch]

(Edited due to content being accidentally deleted when checking a .Zip file.)



I have a 02' as well. I have Tapped the PURPLE wire at the DLC but I'm not getting any Info. I still need to check ALL of my tap splices. But I was surprised to see you HAD used the PURPLE wire at the DLC. After looking at some wire schematics SS sent me I thought the Trip computer serial data was on the YEL wire @ the DIC behind the Cluster. I have made all of my taps (except the Pink wire @ the BCM and the purple wire) at the IPC behind the stereo system. Per the instructions sent by JPcustoms with the wire harness I purchased. I still have not heard back from Jason and will try PM'ing him soon.

This has been a very frustrating MOD.

The only other possiblity I can come up with (after still needed to do all of the above) is the unit I have is defective.

Ditch