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Do you mean that you are looking for the fuse? The fuse for the cigarette lighter is located in the fuse block under the left side of the dash. it is marked "CIG". It is a 15 Amp fuse
NOTE: This fuse also powers your clock, air bag sensor assembly, remote control mirror switch and your shift lock. If this fuse is blown, you will also have problems with these items.
Your vehicle is also equipped with an auxilliary power outlet (Which looks the same as the cigarette lighter socket) it is powered by the fuse marked "*1" If this fuse is blown, only the power outlet will not work. This also is a 15 Amp fuse. (See picture below)
you will need a wiring diagram to find problem, first make sure the power feed circuit is good, use a test light or volt meter will be better, some times cigarette lighter circuit and o.b.d.II feed share same circuit. also look at signal circuit. it should b between 5*7 volts.
THE OBD 2 GET IT BATTERY POWER AT THE DIAGNOSTIC LINK CONNECTOR.WHEN YOU PLUG IT IN TO DATA LINK.THE OBD 1 SCANNER WILL POWER UP AT CIGARETTER LIGHTER OR AT THE BATTERY.MY SCANNER IS POWER UP 9 VOLT BATTERY WHICH BRINGS IT UP UNTIL I POWER UP USING CAR LIGHTER.
check fuse number 5 in the passenger compartment fuse box, it is a 10 amp, that is the OBD connector power supply, if that fuse is good just run power to pin number 16 of the connector, this the bottom row of pins last one on the right.
first check the fuse, next, get a light tester and see if you getting power to the lighter unit. two wires to your cigarette lighter one black for - and red for +, if you getting power, your line is good that mean your cigarette lighter unit does does not have a good contact to what ever is plugging in. replace the unit; if no power to the unit, test the cigarette fuse and see if the wire is hot. if not you have a short to the fuse. hope that help some..good luck
2006 GMC Sierra OBD not giving power
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