2004 GMC 1500 Sierra. Question: How to and what special tool is required to replace radio.

There are no special tools required to remove the radio. Just a couple basic hand tools. First off, you need to remove the instrument panel bezel that goes around the radio, cluster, heater control head and headlamp switches. It is one big piece, but comes off easily. You will want to tilt the steering wheel as far down as possible and move the gear shift down into low 1. Then pull gently at the edges of the trim piece and it will pop out of it's retaining holes. Then, to take the radio out, there are four 7mm bolts that need removing, two on each side of the radio. Pull the radio out and disconnect the antenna and wiring connectors. Reverse steps to reinstall.


2004 Chev Silverado. 4.8L Vortec.
Question: accessory power outlet blown fuse can,t tel from fuse diagram which fuse controls the outlet.

Answer: The fuse for that is in the under hood fuse block, labeled " AUX PWR" Located to the right of starter relay, next to "RR HVAC" in the block. Best to just check all fuses.


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How Things Work

Baisic Starting System Function and Operation

The cranking circuit consists of the battery, starter motor, ignition switch, and related wiring.

These starter motors are not serviceable and are replaced as assemblies only.

Most of today's starter motors are non-repairable starter motors. They have pole pieces that are arranged around the armature within the starter housing. When the solenoid windings are energized, the pull-in winding circuit is completed to ground through the starter motor.

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Common Engine Codes

Oxygen Sensor Code P0130 - P0141

The powertrain control module (PCM) supplies a bias voltage of about 450 mV between the heated oxygen sensor (HO2S) high signal circuit and the HO2S low reference circuit. When measured with a 10 mega ohm digital voltmeter, this may display as low as 350 mV. The oxygen sensor signal varies from about 800 mV when the exhaust is rich, to about 50 mV when the exhaust is lean.

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