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International Automotive Technicians Network
Re: 2009 Hummer H3
Posted to Technical Discussion Forum on 2/7/2018 1 Reply

h3 manual

The immobilizer system determines whether engine starting will be allowed based on a pull-down voltage created by the security resistor located in the ignition switch. When the ignition is in the START position, 5 volts is applied to the security r... Login to read more.

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