i-350 L5-3.5L (2006)
Ambient Light Sensor: Technical Service Bulletins
Lighting - PRNDL Display Reduced Visibility
2007 Service Bulletins
Information IB07-04-S002
Issue Date: APRIL 2007
PRNDL Display Reduced Visibility For Approximately One Minute
Affected Vehicles
2003-2007 Isuzu Ascender with Automatic Headlamp Control and Vacuum
Fluorescent PRNDL Indicator Instrument Panel Cluster
2007 Isuzu i-290/i-370 (TI) with Automatic Headlamp Control and Vacuum Fluorescent PRNDL Indicator Instrument Panel Cluster
2006 Isuzu i-280/i-350 (TI) with Automatic Headlamp Control and Vacuum Fluorescent PRNDL Indicator Instrument Panel Cluster
Service Information
After backing the vehicle out of a garage or dark environment into a daylight environment, the PRNDL display has reduced visibility for approximately
one minute.
While the vehicle is parked in a dark environment, the sensor for the automatic headlamp/driving lamps senses that it is dark. When the key is turned to
the run/start position, the automatic headlamp module will turn all driving lamps, the instrument panel cluster and PRNDL display ON in the nighttime
mode. The nighttime mode intensity of the instrument panel lamps and PRNDL display is controlled by the automatic headlamp module and can be
dimmed further by the customer using the dimming control of the headlamp switch.
When the customer then moves the vehicle from the dark environment into the bright sunlight, it will take approximately one minute before the headlamp
control module recognizes this as true daylight and not just a bright overhead street lamp shining on the sensor. The headlamp control module will then
turn the headlamps off and restore the instrument panel and PRNDL display to full brilliance.
Without the time delay, the automatic headlamp control module would switch to the night mode (turn on all driving lamps, instrument panel lamps and
PRNDL display would dim) each time the vehicle was driven under an overpass or other darkened environment.
This is a normal condition and no repair should be attempted.
Ensure the instrument panel backlighting control is in the full bright position. This will help alleviate the condition.
You may demonstrate to the customer what happens by placing a repair order over the automatic headlamp control light sensor, which will cause the
automatic headlamp control module to switch to the night mode in approximately one minute. All driving lamps will come ON, the instrument panel
backlight will be dim, and the PRNDL display will also dim to the night setting in conjunction with the position of the headlamp switch dimming control.
Demonstrate to the customer the variance in the instrument panel backlighting and PRNDL display while adjusting the headlamp switch dimming control
to both ends of its allowable range. Advise the customer to keep the headlight switch dimming control in the highest position to allow viewing of the
PRNDL display in a bright
environment.
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