Rainier 2WD V8-5.3L VIN P (2004)
Accessory Delay Module: Diagnostic Aids
Checking Aftermarket Accessories
CHECKING AFTERMARKET ACCESSORIES
Do not connect aftermarket accessories into the following circuits:
SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol.
CAUTION: Refer to SIR Caution in Service Precautions.
OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol.
NOTE: Refer to OBD II Symbol Description Notice in Service Precautions.
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:
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.