i cant find the buffer box on my 91 rs. all i see on the passenger side is the ecm, a little black box that says ac on it and a silver box.

 

iirc, there is no buffer box on 91s. The little black box that says ac is cruise control.

 

damn cuz i jus swapped a t56 in and tryin to wire my sgi5 speedo box and i was told i have to use the wires from the buffer box

 

On tpi in 90-92 there was no buffer box but on tbi there is I have seen them attached to the ecm mounting bracket and behind the ip as well.

 

is ip instrument panel? cuz i looked all behind the passenger side and there was only the ecm, cruise control box and a silver box that might be for srs.

 

yes, Ip is instrument panel. It maybe yellow or cream colored. the black box you saw was the passkey vats module and the silver one is for srs.

 

Ok i dont have an airbag so i dont need the srs box right?

 

It could be your ecm just google the service number on it

 

Ok thanks man

 

1. The SIR module is under the console.
2. The silver box under the dash is for the rear defroster grid.
3. The AC box is the cruise control module.
4. You don't need any speed sensor modulator as long as you have a speed sensor that fits the transmission (unless the VSS with the T56 puts out the wrong number of pulses per mile) because the cruise control and the speedo head get their signals directly out of the buffer built into your ECM. (Could be wrong, have to look in the 92 FSM I don't have handy ATM)
5. If you did have a buffer box, it would be bright YELLOW and would be mounted to the back of the ECM bracket (ECM facing towards the heater box and the buffer facing towards the seats).
6. And the VATS module is under the middle of the dash, behind the instrument cluster on the passenger's side (to the right of the cluster and the left of the heat controls).

 

there is nothing on the ecm bracket or near it that is yellow but my car is a tbi so it should have a buffer box?