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I got the dreaded "Starting System Disabled" message on my '90 Eldorado and none of the usual easy things worked, so had it towed to a garage. Found out on other forums that a bypass is easy if one knows the resistance value of the chip on the key, and that there are only 15 different values of that resistance used by GM. Mine measures 2.37 ohms, but that seems very low. Anyone have those 15 values that you could send me? And any words of wisdom for installing the bypass resistor on an Eldorado?

Thanks

jtnt
 

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1968 Cadillac Sedan deVille, 1994 Chevrolet G20
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Here are the values:
Key Low Nominal High
1 386Ω 402Ω 438Ω
2 502Ω 523Ω 564Ω
3 654Ω 681Ω 728Ω
4 852Ω 887Ω 942Ω
5 1085Ω 1130Ω 1195Ω
6 1411Ω 1470Ω 1549Ω
7 1795Ω 1870Ω 1965Ω
8 2275Ω 2370Ω 2495Ω
9 2890Ω 3010Ω 3150Ω
10 3590Ω 3740Ω 3910Ω
11 4560Ω 4750Ω 4960Ω
12 5798Ω 6040Ω 6302Ω
13 7200Ω 7500Ω 7820Ω
14 9149Ω 9530Ω 9931Ω
15 11328Ω 11800Ω 12292Ω

Your resistance is way out of spec, even for allowing for a mis-set range on the meter. Did you try another key? The system might be working fine...
 

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2000 SLS
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My guess a No 8 key and misplaced decimal on reading. Fix simple. At connector for switch resistance wires on steering column disconnect connector from ignition switch side and in its place insert appropriate resistor.
 
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