2004 Bonneville to 2004+ Grand Prix HUD Conversion Project

The purpose of this upgrade is to get the much improved HUD from the 2004+ Pontiac Grand Prix and either modify the current housing to accept the electronics from the 04 GP unit or see if the 04 GP unit can fit into the space the current Bonneville HUD resides in.

After taking the 04 GP HUD apart, it is a totally different animal. I doubt that it can be retrofitted into the case that the current Bonneville HUD is in now.

One problem is the turn signal switch input to the HUD in the current HUD is derived from the switch itself. On the 04 GP HUD, the turn signal switch signal is received from the Class 2 data bus. This will have to be resolved in order to get the turn signal information into the new HUD. More than likely will require a special circuit to inject the signal onto the Class 2 bus as this comes from the BCM on the GP. Have to check this as the turn signal lamps in the cluster of the Bonneville actually turn on and off via class 2 signals according to the schematics. So, it may be possible that the instrument cluster is putting these signals out on the class 2 bus as well.

So I need to get some parts in order to try and see if this will work:

Bonneville HUD Bracket – 25715446 -  Need - $7 – Possible use to secure the 04 GP to the Bonneville
Bonneville HUD Harness – 12084944 – Need – $4 - Plugs into the HUD Module
04+ GP HUD Switch – 10438819 – Need - $15 – To hook up the HUD Switch to the HUD Module
04+ GP Compass Module – 15236913 – Need - $90 – Need for DIC to read compass direction
          Note: Bonneville compass module should work as well and uses same harness as below.
04+ GP Compass Module Harness – 12102629 – Need - $46 – Plugs into Compass Module
Ambient Air Temperature Sensor – 25775833 – Need - $4 – Needed for DIC to read ambient air temp.
Ambient Air Temperature Sensor Harness – 12101856 – Need - $15 – Plugs into Temp Sensor
04+ GP HUD Module – Have
04+ GP HUD Harness – 15306185 – Have - $27 – Plugs into the HUD Module (Got sample parts from Tyco Electronics and made my own harness)
04+ GP HUD Switch Harness – 15263108 – Have – $30 - Plugs into the HUD Switch (Got sample parts from Tyco Electronics and made my own harness)
04+ GP Trip Computer / DIC– Have
04+ GP Trip Computer Harness / DIC – 15305996 – Have - $48 – Plugs into DIC Module (used connector from the Bonneville Fog Lamp / Interior switch that I purchased on ebay – perfect fit.

With these parts I should be able to wire up both HUDs outside of the car and test them. Mainly need to hook up the 04 GP HUD to the Bonneville Class 2 Bus and see what it shows. From there then we can determine if it is even worth it to attempt to install this 04 GP HUD into the Bonneville.
 
8/3/2011: Hooked up the 04 GP HUD to the Bonneville using the DLC and it does work!
It did note to check the Trip Computer Connections so I think the HUD gets some information from the Trip Computer which I did not have hooked up at this time.
The HUD had no problem displaying the speed. The E/M switch on the Bonneville does change the setting in the HUD as well.
The Traction Control ON/OFF switch does work then you turn the Traction control OFF. There is no indication when you turn it on.
The turn signals did not indicate in the HUD.
The High Beam did not indicate in the HUD.
Some radio information did show up in the HUD. On XM Band, it did not show up in the HUD unless you pressed BAND, and then went to XM and changed the stations there before the indication went off the HUD display. The AM and FM and CD Track information works in the HUD at all times. The XM will work if you switch the BAND to XM and then select channels. It shows the Channel Name in the display. Not sure if this information comes from the XM radio module or the Radio itself. Will have to try a later model radio in the Bonneville and see if this resolves this issue. If not, will have to get a later model XM Radio module and see if that resolves the issue.

So, in limited testing the HUD does have some good functionality. Next steps will be to get the trip computer hooked up in addition to the HUD and see how much more functionality we receive. I also need to get the HUD switch so that I can change the mode of the HUD display to see if I can get to the other screen modes.  I think it worth it to try and integrate this 04 GP HUD into the Bonneville.

Finished building my proto board that allows me to hook up to the car via the OBDII connector and then connect to the 04 GP HUD, HUD Switch and DIC/Trip Computer along with another connector for connecting to a ELM327 based interface. Since the HUD and Trip Computer get their power signal from the class 2 bus, I need them hooked up to the car in order to get them to work at all. I really need to find the Power Master Mode codes by sniffing the bus so I can do this on the bench. 

In any case, the added functionality  from adding the Trip Computer to the bus is:

Gear Indicator appears in the HUD now. 
Outside Temperature appears in the HUD now.
When you press the traction control button to off, the car emits a beep now.

So I have some more codes I need to get from the bus so that I don't have to install the trip computer to the car to get this information onto the HUD.  

Progress is slow, and I plan on scanning the bus some more in the coming weeks and see what else I can figure out so I can program all this stuff into a microcontroller and let it translate some of this information to the HUD.