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how close do resistors have to be to oem?


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peterubers 
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Posted: February 20, 2007 at 10:00 AM / IP Logged  

In a 2006 G. Cherokee...

The 1084.pdf states 560ohm and 150ohm resistors required for the second start and acc'y relays --

1) Can I use 1/4 watt resistors? or do I need > 1/2 watt resistors

2) The resistors I can obtain are from Radioshack and have only a 5% tolerance -- so when I put a few in series to make the right resistant (R_t = R_1 + R_2) or v.v. and put a few in parallel (1/Rt = 1/r1 + 1/r2) -- i figured i'm also factoring in a larger tolerance using multiple resistors to make the right total resistance in the circuit.

3) For those out there -- are the 5% tolerance Radioshack resistors ok?  Also, if I decided to use a potentiometer to help "dial in" the perfect resistance -- can I use a 5K ohm audio-potentiometer from Radioshack?  I would prefer a linear pot. but all they have are the 5K audio pot's. 

Thanks

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peterubers 
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Posted: February 20, 2007 at 10:08 AM / IP Logged  
Also -- does anyone know if the OEM Grand Cherokee has a "take over" mode.. in that when you start the car .. it takes over to complete the start so you don't have to "hold" the key in the III (or crank) position the duration of the start. 
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Hymer 
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Posted: February 20, 2007 at 10:29 AM / IP Logged  
Radio shack resistors are fine, the 1/4 wat ones do the trick it's only ground through resistor so there really isn't any current through them. They do need to be fairly close to the resistances that the oem needs to see.. I find it much easier to use the bypass modules.. XK532 or pkuchdl7's that do the 2nd accy starter and door locks without using the resistors.. it saves a lot of time.... As far as the take over mode, I guess Im not really following.. someone is to lazy to hold the key in the crank posistion?how close do resistors have to be to oem? -- posted image. I guess take over to me is when ya hit the start button on the remote when the car is running and the rs takes over...
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High End Restyling and Comlete Repair
peterubers 
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Posted: February 20, 2007 at 12:23 PM / IP Logged  

Thanks for the reply ... let me clarify about the "take over mode"

Newer cars have a feature where you just tap the key to the III or "Crank" position and it'll start the car on it's own -- i.e. you do not need to "hold" the key in the crank position long enough to hear that you've started the engine. I know Benz's have this, new Infiniti's and Acuras as well.  It's basically like a Push button start, but instead of having an OEM Start button on the dash, you have to turn the key and tap the "Crank" position to do the same thing

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green6767 
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Posted: February 20, 2007 at 12:50 PM / IP Logged  
Chrysler products to the best of my knowledge do not have the feature you talk about.
Shaun, we are the same height, that is neat!
12V Installation Technician for Honda, Dodge, Chrysler, Toyota and Jeep.

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