99max5speed

I just put a 01 cluster in my 99 and every the works great except speedo. im not sure where the number 2 wire on the unified meter control box of the 99 hooks up to the 01 cluster
99 cluster
5[ATTACH][ATTACH]
2001 cluster
7473[/ATTACH][/ATTACH]

DennisMik

iTrader: (2)

I have never done this swap, so I can't speak from experience. Every electrical device needs at least 2 wires for a complete circuit. Looking at the schematics, The difference between the 2 is that the 99 VSS gets both the signal and the ground from the cluster. On the 2001, the VSS signal goes to the instrument and the ground comes from the ECU.

I can't determine which pin on the 99 is the ground. In the 99, chassis ground comes into the cluster on pin 16 and goes to the Unified Meter Control Unit.

In the 2001, the VSS gets its ground from the ECU, but I don't know if this is the same as chassis ground or not. The ECU has its own separate ground circuit for certain things and for measuring certain signals in the ECU, you will not get and accurate reading by using chassis ground.

All you can do is try connecting the wire in question to chassis ground and see what happens. One thing you should be aware of is what pin 1 on the 99 does may not be what pin 1 on the 2001 does. So maybe pin 1 on the 99 is the VSS signal. On the 2001, it could be pin 2. If you have the wires reversed, all that will happen is that the speedometer will try to show negative miles per hour and the needle will sit on the peg.

I can't predict what will happen with the ground. Assuming you get the polarity correct, if the VSS needs the ECU ground and you have connected it to chassis ground, I don't know if the speedometer will register incorrectly or not work.

Try the chassis ground. If the VSS really needs the ECU ground to work, then you will have to run a wire down to some ground pin on the ECU.

maxprivate

iTrader: (12)

Ive done a cluster swap in my 97 to a 2001 AE 5th gen cluster. The VSS i would bring it the ECU ground from the VSS if possible or any ground on the ECU.

Like Dennis posted, if you're using a chassis ground it may not be sufficient to get the speedometer to register speed at all.

Post back when you get this working. I also would like to know if you get that delay when the speedometer will register speed. Usually your speed has to be 10 to 15 mph before the speedometer registers the correct speed. If I'm not mistaken the delay if due to different speed sensors between the 4th and 5th gen. All that has done this swap has reported the same delay in the speedometer.