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Convert a negative output to a positive output relay wiring diagram if you have a switch or an alarm or keyless entry that has a negative output that you wish to use to switch a device that requires 12v such as a horn dome light parking lights head lights hatch release etc wire a relay as shown below to convert the negative output . Click here to see the trouble codes for a passlock system click here to see a typical passlock wiring diagram if you have a passkey system click here to see the reset procedure. On the left side of the radio cavity there will be an opening through which you will be able to see the ignition switch three thin wires possibly taped together with fabric tape will be visible coming from the top of the ignition switch. Gm security systems are killing cars all over the us only solution is to disable them permanently this is what newrockies inc is all about. Hello all ive searched everywhere and tried just about everything ive got a 99 2500 with 200k on it that has been sitting for 6 months to get it to start i replaced the battery and starter