K 1500 Truck 4WD V8-350 5.7L (1986)
Dimmer Switch: Technical Service Bulletins
IP Dimmer Control - Proper Setting
File In Section: 08 - Body and Accessories
Bulletin No.: 99-08-42-009
Date: November, 1999
INFORMATION
Subject:
Proper Setting of I/P Dimmer Control to View PRNDL Display with Automatic Headlamp Control
Models:
2000 and Prior All Passenger Cars and Trucks
With Automatic Headlamp Control and Electronic PRNDL Display
Under certain conditions, if the instrument panel dimmer control is turned relatively low, the PRNDL will not be visible until the automatic headlamp
control turns the headlamps off and the daytime running lamps (DRL) are turned back on. Such a condition may be if the vehicle is first started in an
environment where the headlamp control turns on the headlamps and then the vehicle is driven out into a brighter environment (for example, when a
vehicle is backed out of a dark garage into the bright sunlight).
This condition is normal and any repair attempt will not be successful. Demonstrate this condition to the customer using the service lane and then turn
the instrument panel dimmer control to a higher setting. This will enable the driver to see the PRNDL display
