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Test between a solid ground and the positive voltage pin (red wire with black stripe). What's the voltage?
One ground is constant (a fixed connection to a chassis ground - brown wire) and is used for the operator switched on position. Test it against a good 12V+.
The other ground is fed by the immobilizer when either door is opened (brown wire with yellow stripe). Test it with door open against a good 12V+.
No fuse on the dome light circuit...
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