hooking up 508d to viper 5904?

Hi, can someone help me. I want to hook up a 508d to my viper 5904. Can I hook it up wire color to wire color off the shock sensor as I read? Also the mounting position? in plain site? Thanks

Yes, you can wire the 508d color for color with the shock sensor.

Red - 12v
Black - Ground
Blue - Instant trigger
Green - Warn away

You should diode isolate them to prevent interference from each sensor. Standard 1-amp diodes (1N400x) will work. To do this, cut the current sensor wires (only the blue and green wires) and place diodes (band facing the sensors) on the end of each green and blue wire coming from the sensors. The side of the diode without the band goes to the alarm side. The 2 diodes on the green wires get connected to the green wire going to the alarm. Do the same with the diodes from the blue wire.

You can mount the 508d in plain sight if you wish. You want to mount it in the center point of your car inside. If you have a cover on your center console, you can stick it to that or even underneath the whole center console if it's plastic.


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Thanks for the info shortcircuit I really appreciate it. One quick question? the shock sensor plug going into the alarm has 2 green wires that are looped, do I cut them? If so, do I connect the two cut green wires to the green diode wire coming from the 508d? Thanks again

You can cut that loop yes and connect them as you stated. You want to have independent connections with the green and blue wires from the sensors to allow the warn feature to work correctly.



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Yes, got it. Thanks again!

Maybe a stupid question but  the diode is 1 amp but what voltage should I buy?

You can get any of the 1N400x series. 1N4001-1N4007 will work great. The voltages vary slightly but those are the industry standard diodes used.

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I have to ask this....

Why are you re-creating the wheel by cutting wires, and splicing in diodes to the existing shock sensor, when you have a spare sensor port?

You have a dei alarm, and a dei sensor. Both have the same 4 wire connector for a plug and play (at least for up to 2 sensors like the shock and prox which is what you have)

Why dont you just plug the 508d into your spare sensor port (next to the thermistor, on opposite side of the H3 10 pin remote starter harness?

Take care,

Chris

Hey Chris, I wasn't trying to reinvent the wheel. My alarm (Viper 5904) clearly states that the Aux ports NOT to be used with the 508d or the likes because it can't handle the current draw ( like the older models) out of those ports. That's why I asked.

Peter

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Don't know what the problem is yet... but I know what it's not.

Someone on this site tried it with a 5704* and it worked.
If you're worried plug it in but route the red and black power and ground to the unit's red and black.
I can't see what the problem is because the 508d draws no more juice than say a shock sensor.
*AFAIK the only difference between a 5704 and a 5904 are the remotes.

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

I don't think they are the same.

This is quoted from the install manual:

< size=3 face=Futura>< size=3 face=Futura>

Note: < lang=KO size=2 face=Futura-Book>< lang=KO size=2 face=Futura-Book>Sensor ports 1 and 2 cannot support sensor 508D due to current limitations. These ports are also

constant power and ground connections.

End quote.

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Don't know what the problem is yet... but I know what it's not.

It says exactly the same on the 5704.
How do you think we wired up the 508d before mux ports?
The only difference is that the ground on the mux is GWA rather than constant.


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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

So it's a misprint or just poor documentation on DEI's part?

Not having installed it as yet, I've taken my 5904 apart and traced the circuit topology. What I have found is that there's a 100 ohm resistor between the decoupled/regulated 12V rail and the 12V output to the sensor.

Upon power up, I found the sensors cause a 1.00 - 1.3V drop across the final 100 ohm resistor, with the final voltage reaching the sensor being VCC - 1.5V which suggests to me that there's a current draw of around 10 - 13mA. The difference is, the shock sensor doesn't draw the full amount until triggered whereas the 508D draws this full power constantly.

As such, this leads me to the following conclusions:
1) It's perfectly OK to plug the 508D into the sensor port given the little current drawn (13mA maximum).
2) Despite point 1, it would still be good RF practice to only power the 508D when the vehicle is armed. No point in generating any RF where it's not required. While the microwave radiated isn't enough to even take down a Boeing's avionics, it's still good practice nevertheless.

That's why I'll be disconnecting the ground wire from the 5904 end of this sensor lead and connecting it to the GWA wire of the 5904 system instead.

Otherwise, if you're happy to keep the RF going all the time, then just plug it straight in and you'll be OK.

Artstar, you are absolutely correct and I agree with every point you made.
1) I suggested to someone else he plug it in on a 5704 worked perfectly.
2) I'm pretty sure that on previous models the mux port ground pin was actually GWA and that could be the problem.
When they misprint, DEI usually get their lock unlock and aux wires the wrong way round so I don't think it's a misprint they should have suggested people do exactly what you did.

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

I plan to get a little cheekier with mine on second thought and will cut the ground connection to the actual sensor connectors on the 5904 and reterminate them to the GWA internally. That'll make for a neater solution.

I wonder why DEI changed that anyway?

Because a Chinese circuit designer had a brain fart!

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

Yep, I'll accept that answer. :)

Can you just hook up the ground wire from the sensor to the gwa H1/6 of the 5804?

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Don't know what the problem is yet... but I know what it's not.

*5904

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Don't know what the problem is yet... but I know what it's not.

Yes.

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

bospet40 wrote:

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Can you just hook up the ground wire from the sensor to the gwa H1/6 of the 5804?

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Absolutely. That's the internal modification I made. I cut and lifted the ground pin on the sensor connector and then soldered an internal wire from H1/6 to it. That'll keep the installation nice and neat.