Hello all,

My friend just picked up his '06 Z06 and I have offered to help him bypass the Nav "feature" that doesn't let you program it while the car is in motion. While I'm a big fan of keeping your eyes on the road, there should at least be an option for a passenger to enter a destination while moving.

I have an '05 Denali with Nav and I did the Nav bypass and posted the "how to" over on the Chevrolet Avalanche board. Many folks over there have done this mod - and love the added flexibility.

On the Denali (and I assume the same for the Vette), all you have to do is cut and wire the Vehicle Speed Sensor (VSS) wire to a SPST switch. Opening the switch prevents the Nav head unit from seeing a speed signal and it therefore assumes you are stopped. When you are done entering a destination, just turn the switch back on again.

So, as I said, I am interetsed to do this for my friend - and also to publish pictures and a "how to" here. I would just like someone to send me the wiring pin-outs for the radio connectors. I just need to know the color and location of the VSS wire and I can take it from there. Can anybody help me with this info.

(Sorry in advance if this has already been done. I DID use the search and couldn't find anything on this topic.)

 

Doubt it is possible we have the worst NAV system GM has to offer.

 

If you find something out let us know. If love to be able to know the wrong route while driving!

 

This should work - however - there's one catch. The nav uses the speed input for dead-reckoning and updates that from the GPS. So cutting this will mean that the nav will be (further) off when the GPS signal isn't available. In other words, accuracy may suffer. Of course, it's not always quite right anyway, but it beats the heck out of some - like this one:
http://www.theregister.co.uk/2005/01..._instructions/

 

Buffy -

You are correct about the dead reckoning. Additionally the Nav uses vehicle speed to compute and update its location - in combination with the Sat signals. The way I (and others) use the bypass in the GM SUV's is that we just "open" the switch to allow for entry of a destination, for example. As soon as the destination is entered, you close the switch and the head unit once again has its speed input. When conveniently positioned, flipping the switch, entering data, and then flipping the switch back is far less intrusive than having to stop and program the unit.

As you point out, the work-around is not perfect. The (stupid) GM units almost stop updating map position while it believes the vehicle is stopped. It resumes but it is incorrect for a while when the switch is once again closed. Ultimately it gets itself all consistent again but it takes a few minutes.

Having done and lived with this mod, it is really easier and more "liveable" than I have made it sound. If it works the same as the GM SUV's, I think a lot of people would think it is a worthwhile mod for the vette.

I just need the pin-out/color info if anyone has....

 

Try this - pin-outs for the Nav radio:

12 way connector

Pin A - ORG - Amplifier Mute Signal
Pin B - GRY - Radio Vehicle Noise Compression Enable Signal
Pin C - Not Used
Pin D - DkGRN/WHT - Vehicle Speed Signal (Denso Radios)
Pin E - Not Used
Pin F - Not Used
Pin G - Not Used
Pin H - DkGRN/WHT - Right Audio Signal
Pin J - BRN/WHT - Left Audio Signal
Pin K - Tan/WHT - Audio Common
Pin L - LtBLU - Remote Playback Device Audio Common Signal (UL2/UE1)
Pin M - ORG/BLK - Remote Playback Device Audio Signal (UL2/UE1)

24 way connector - Row A on Top side, Row B on Bottom Side

Pin A1 - ORG - Class 2 Data Bus
Pin A2 - Not Used
Pin A3 - Not Used
Pin A4 - YEL - FM Composite Signal
Pin A5 - Not Used
Pin A6 - Not Used
Pin A7 - Not Used
Pin A8 - Tan - Left Front Low Level Audio Signal (+)
Pin A9 - DkGRN - Left Front Low Level Audio Signal (-)
Pin A10 - Tan - Right Rear Low Level Audio Signal (-)
Pin A11 - DkBLU - Right Rear Low Level Audio Signal (+)
Pin A12 - BLK/WHT - Ground
Pin B1 - RED/WHT - Battery Positive Voltage
Pin B2 - Not Used
Pin B3 - WHT - Antenna Enable Signal
Pin B4 - Not Used
Pin B5 - Not Used
Pin B6 - ORG - Amplifier Mute Signal
Pin B7 - Not Used
Pin B8 - BRN/WHT - Left Rear Low Level Audio Signal (+)
Pin B9 - BRN - Left Rear Low Level Audio Signal (-)
Pin B10 - LtGRN - Right Front Low Level Audio Signal (-)
Pin B11 - DkGRN - Right Front Low Level Audio Signal (+)
Pin B12 - Not Used

 

Buffy,

Perfect, thanks. I'll let you know how it turns out!

 

Use a switch to enter info with the speed sensor wire disconnected then switch it back for the drive. No trade off.

 

Already did it, it didn't work!!! Unless of course I cut the wrong wire? I think it actually uses the gyro to detect motion, I'm going to try to disconnect the GPS ant next and see if that works. If not we're stuck cause it's using the gyro.

 

Could it be that the vehicle has to be in park, neutral or have the parking brake set?

 

No because if you're sitting still w/o brake set you can do it. You can actually enter things in up to about 3-5MPH

 

This suggestion has been made here before on an earlier thread (couldn't find it though) and it seems to be legit. Please keep us posted.

 

runutzzzzz, unfortunately you probably cut the right wire, but I will confirm on Saturday. If the head unit is not getting the speed signal from the VSS, then it is getting it from the BUS wire, (Pin A2). The BUS is essentially a simple network wire running throughout the car with multiple devices connected that can read and write to the "network". BUS wires are becoming more popular on cars as the manufacturers try to cut down on the number of wires and complexity. Unfortunately, making simple devices that can read and/or add the right "word construct" on the network is not that easy (for people like me).

It is perfectly plausible that the ECU provides a "Nav OK" signal on the BUS that is read by the head unit..... in which case my simple VSS switch fix is out the window.

 

That would be awesome if you could hack that...i had the nav on my 05, one of the reasons i didnt get it on my 06 was the fact that it couldnt be programed while moving, it almost defeats the point of having it if you cant change your route and directions on the move. I figure if i miss it that much i can just get an aftermarket unit like i have in my DD, it does allow motion programing with a simple wire to the ebrake.

 

Sorry for the 1-week delay. Finally got my hands on the Z06. Unfortunately, this mod didn't work. We cut the Dk Grn/white VSS wire, but it didn't help a darn bit. I'm pretty sure the Nav radio is getting an "OK we're stopped" signal over the BUS (network). In other words, the ECU sees the VSS signal too and tell the Nav unit via the bus when it is OK to allow input. I hope I'm wrong - but I don't think this is going to be as easy as the other GM vehicles (Denali, Escalade, Tahoe, etc).

My recommendation to those who want Nav is that you should seriously consider the Eclipse AVN5435. More info can be found here. .

In Double-Din GM vehicles that have steering wheel controls, this Eclpise unit might be a step down in useability. However, as the Vette has no steering wheel controls, I frankly thing the Eclipse is superior to the GM unit is EVERY way. The screen is better, the user interface is better, the audio specs are better, you can watch a DVD (at any speed), and best of all, you can program it while moving!

I have a 5435 in my daily driver and I love it.