Chevrolet Workshop Manuals
Astro Van 2WD V6-4.3L VIN W (2001)
Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Accessory Delay Module > Component Information > Diagrams > Diagram Information and Instructions > Page 12
Accessory Delay Module: Diagnostic Aids
Basic Knowledge Required
Without a basic knowledge of electricity, it will be difficult to use the diagnostic procedures contained. You should understand the basic theory of
Checking Aftermarket Accessories
Do not connect aftermarket accessories into the following circuits:
CAUTION: Refer to SIR Handling Caution in Service Precautions.
SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol.
NOTE: Refer to OBD II Symbol Description Notice in Service Precautions.
OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol.
Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the
Possible causes of vehicle problems related to aftermarket accessories include:
Power feeds connected to points Other than the battery
Transceiver wiring located too close to vehicle electronic modules or wiring
Poor shielding or poor connectors on antenna feed line
Check for recent service bulletins detailing installation guidelines for aftermarket accessories.
A circuit breaker is a protective device that is designed to open the circuit when a current load is in excess of the rated breaker capacity. If there is a short
Circuit Breaker: This type opens when excessive current passes through it for a period of time. It closes again after a few seconds, and if the cause
Positive Temperature Coefficient (PTC) Circuit Breaker: This type greatly increases its resistance when excessive current passes through it. The
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