Many electrical accessories stopped working suddenly

Good evening,

With all those items not working, it could be an ignition switch that has failed as that is what supplies voltage to all those components.

There was a recall on these GM switches for all kinds of issues. I would call your local dealer, give them your VIN number and see if there are any open recalls on your truck.

Roy

Ignition Switch Replacement

Tools Required
J42759 Ignition Switch Connector Release Tool

Removal Procedure
1. Disconnect the negative battery cable.

2. Caution: Refer to Restraint Systems Caution in Service Precautions.

Disable the Restraint Systems. Refer to Restraint Systems Disabling and Enabling Zone 3 in Restraint Systems.
3. Remove the hush and knee bolster.
4. Remove the steering column trim covers.
5. With the key installed, turn the key to the RUN position.

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6. Install an allen wrench into the hole on top of the lock cylinder housing. Push down on the allen wrench to release the tab on the lock cylinder inside the lock cylinder housing.

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7. Slide the lock cylinder out of the lock cylinder housing.
8. Disconnect the PASSLOCK and key buzzer from the lock cylinder housing.

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9. Insert J42759 into the lock cylinder housing to release the tabs on the ignition switch.
10. Pull the ignition switch out of the lock cylinder housing.
11. Disconnect the connector from the ignition switch.

Installation Procedure

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1. Important: The gears between the ignition switch and the lock cylinder housing must be in the correct position. Failure to do so will cause a misalignment of the gears in the ignition switch and the lock cylinder housing, which may result in a NO START or BATTERY DRAIN.

Hello,

This sounds like you could have a problem with Ground #302 of your vehicle. In the diagrams down below I have included the ground distribution wiring diagram and the location of ground #302 along with wiring harness diagrams with call outs for your vehicle as well. Please use these guides and inspect ground #302 and make sure it is clean, corrosion free, and tight. Please get back to us with what you are able to find out.

Thanks,
Alex
2CarPros