K 2500 Yukon 4WD V8-6.0L VIN U (2000)
Equivalents - Decimal And Metric (Part 2 Of 2)
Basic Knowledge Required
Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained in this section. You should understand the basic
theory of electricity and know the meaning of voltage (volts), current (amps) and resistance (ohms). You should understand what happens in a circuit
with an open or a shorted wire. You should be able to read and understand a wiring diagram.
Refer to Strategy Based Diagnosis in General Information in order to properly diagnose and repair the customer concern.
Checking Aftermarket Accessories
Do not connect aftermarket accessories into the following circuits:
CAUTION: Refer to SIR Service Precautions Caution in Cautions and Notices.
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SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol.
NOTE: Refer to OBD II Symbol Description Notice in Cautions and Notices.
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OBD II circuits, all such circuits are indicated on circuit diagrams with the OBDII symbol.
Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the
system to verify that these add-on accessories are not the cause of the problems.
Possible causes of vehicle problems related to aftermarket accessories include:
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Power feeds connected to points other than the battery.
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Antenna location.
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Transceiver wiring located too close to vehicle electronic modules or wiring.
