Installing Viper 791vx In 99 blazer?

[sparkplug121988 10+ year member]

What color wire its not saying. Also is their a certain thing I have to do to learn the tack

 

[Worlddre 5,000+ posts]

wire is light guage blue from the mini harness on the XCRS

tach learning...start the car with the key...press and hold the valet switch until the led lights solid and you are done

 

[sparkplug121988 10+ year member]

Ok the only wire I see that I can use is the blue/white off the remote start harness for 2nd statuse/ rear defoger. And as for programing the tach I tried what you said and no luck. The led will not light up when pressed while the car is running. ???? I am confused I have check all wires for the by pass. The only wire not being used is the one to the starter relay and bulb check. Do I need those? I have also checked the tach wire and is the right one. So I'm not sure what to do now

 

[Worlddre 5,000+ posts]

you must press the valet switch with like 10 seconds of starting the car

the harness im talking about with be small with 4 wires it will plug into the RS relay pack next to the ribbon harness... It will have a blue, purple, orange, and pink wire. These wires will be no more then for inches long the blue wire is your status wire or you can use the blue wire in the RS ribbon harness which is what i used to do as i never liked to the end look of the mini harness

 

[sparkplug121988 10+ year member]

Ok I changed the status wire to the mini plug with the blue wire. But still nothing its doing the same thing. And it still wont learn the tach. What should I do. I know the connection are good because I was soldering them. And I have doubled checked.

 

[Worlddre 5,000+ posts]

what bypass are you using?... check programming make sure how did you test your tach wire?

 

[sparkplug121988 10+ year member]

dei 555 and I used a multi meter set on ac an the wire read 1.6 at idel on the red plug at pcm. And as far as programing they say start the car run for 5 sec and then shut off.

 

[Worlddre 5,000+ posts]

press and hold the valet button within that 5 seconds....if that wire doesnt work the odd colored wire at any injector will work as well...555l?

 

[Fiercetimbo17 10+ year member]

Where did you get your tach?

Your AC voltage should increase with an increase in RPM.

To learn the tach you just start the car press and hold the valet, the led will light up and stay constant when you have done so correctly. Then turn it off.

 

[sparkplug121988 10+ year member]

I got the wire for the red plug at pcm and still no tach learn! I have pressed it within 2 sec of starting and no led.

 

[sparkplug121988 10+ year member]

And its the 555lw

 

[sparkplug121988 10+ year member]

Also the injectors are under the uper plinium so how do I find that wire

 

[Worlddre 5,000+ posts]

set for voltage real quick and see if it works...if it does then you have a tach problem

 

[Worlddre 5,000+ posts]

or an ignition coil

 

[sparkplug121988 10+ year member]

ok I changed the wire for the tack and it is now learning it but still won't run. I am doing that right now