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How do you by-pass ignition switch on 1980 Chevy Silverado

You can't, without a bypass kit and the orginal key or resister value to use in the bypass kit. The theft system on the truck is a VATS system that uses a resister in the key that must match the resister value in the computer to start the car. No resister match, no start. The kit eliminates the resister key by hard wiring the resister permanently in the vehicle. You still will need the key to mechanically unlock the steering column and turn the ignition cylinder.

Sep 23, 2017 | Chevrolet Silverado Cars & Trucks

1 Answer

What is the resistance value of a crancksharft position sensor on nissan xtrail

i think the crankshaft sensor on the xtrail is not resistive but is a hall effect sensor which generates a digital on/off signal using a semiconductor device and can only be tested by suitable diagnostic equipment using the obd connector, if it turns out be a resistive sensor then about 1000 to 1400 ohms would be the norm value for that type of sensor hope this helps

Mar 01, 2017 | Nissan Cars & Trucks

1 Answer

I have a 2000 pontiac firebird the security light keeps flashing and my car want start unless you cross it over then it will start and run for a couple of seconds then it quits anybody have any ideal

You have two choices ! 1 is take to auto repair shop an have it fixed the correct way . 2 do an anti-theft system by pass , which may not be the problem . These systems do have a problem with the wires breaking at the lock cylinder . When you stick the key into the ignition lock there are two contacts inside that touch the resistor pellet .The resistance of the pellet is read by the BCM ,if correct the vehicle starts , if not the BCM sends a disable signal to the PCM - engine computer to disable the fuel injectors . That's what is happening on your vehicle , starts for a couple of seconds an dies. Fuel injectors are being shut off .

The personal automotive security system (PASS-Key?®) system is designed to prevent the engine from starting if the proper resistance is not sensed from the ignition key. Of the 15 different key codes or resistance values available, only one will work with each body control module (BCM). Once the key code is programmed into the BCM, the resistance value is stored in a non-volatile memory.
The PASS-Key?® system prevents the engine from starting by controlling the starter relay and the powertrain control module (PCM) fuel enable input. If the PCM does not sense the proper frequency signal on the fuel enable input, fuel will not be provided to the engine.
If the wrong resistance value is sensed when the ignition switch is in the RUN position, the BCM will not ground the starter enable circuit and will not output the fuel enable signal for approximately three minutes. The engine is prevented from starting and discourages a thief from trying key codes or resistance values at random.
If the correct resistance value is sensed when the ignition switch is in the RUN position, the BCM will ground the starter enable circuit and output the fuel enable signal. The engine will start normally.
If the PASS-Key?® system detects an open or short to ground when the ignition switch is in the RUN position, the BCM will default to fail enable. Fail enable occurs when the proper key resistance is sensed before the open short to ground occurs. This has to occur for 1 minute before the fail enable is engaged. Fail enable will illuminate the security indicator lamp and allow the operator to stop and start the vehicle until the problem is corrected.
You can test to see what the resistance is with an ohm meter across the pellet on the key . An then find the wires coming out of lock cylinder an see if you read same resistance ,with key in the ignition cylinder . If you do the wires are ok , if not then you can do the by pass . Go to radio shack an buy a resistor of same value an solder it in between the wires of the harness side , not ignition side . But ,if the wires are good an you can read the resistance value ,then you have other problem an need to have Trouble codes checked .

Mar 24, 2016 | Pontiac Cars & Trucks

1 Answer

What is the resistance value for the ANT700R Digital antenna

this will be infinity as there is no connection if the plug is assembled correctly

Aug 20, 2014 | Cars & Trucks

1 Answer

My 1993 firebird was running fine after changing ignition switch and now it will not crank? told it was the vats key mod. need to know how to bypass it and where its located

Is there a pellet in the key. This type can be bypassed the pellet pushes to resistors outward to a given value from #1 to #14 if you can read key resistance then go to a electronics store a by a resistor that value now crawl under dash by gas pedal you will find a orange cord with two white wires in it place resistor across both wires and cut wires off leaving the ones going up steering column open. turn key on if security light is flashing wrong resistance value. try again. a haynes manual should have all resistance values but key code.

Nov 12, 2013 | 1993 Pontiac Firebird

1 Answer

ONIDA 29 OXYGEN THUNDER circuit diagram


Feb 15, 2013 | Cars & Trucks

1 Answer

How do you bypass the security system on 94 Cadillac sedan deville

you need to tear down the steering wheel and get to the wires that read the value of the key resister ~~ then you need to solder in a resister of the correct value and from then on the key resister will no longer be needed.


Sep 26, 2012 | Cars & Trucks

1 Answer

Need resistance values to check coil for 1990v6

use a new module ,not a second hand one

Apr 08, 2010 | 1990 Toyota Pickup

1 Answer

Relay resistance values

Relays only have coils inside most of the time. and resistance in these coils is not relevant to diagnosing them. The contacts do develop resistance when they go bad, but there is no standard for a any given resistance. The bestway to check a relay is to energize the coil with 12V. Then checking the resistance to the contact. There should not be any resistance at all. If there is any then the contact is bad.

Jun 28, 2009 | 1999 Ford Taurus

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