“Check Trans” Warning Light; Automatic Transmission Fluid Temperature Warning Light; Daytime Running Lights (Drl) Indicator Light - Isuzu NPR 2008 Owner's Manual

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"CHECK TRANS" Warning Light
When the engine control switch is turned on, the indicator light
comes on for approximately 2 seconds and then goes off
automatically.
If the indicator light starts to blink while driving, it indicates that there is a
malfunction in the automatic transmission's electronic control system. If the
indicator light is found blinking, contact your authorized Isuzu medium duty
vehicle dealer promptly for repairs.

Automatic Transmission Fluid Temperature Warning Light

The "A/T OIL TEMP" warning light warns that the automatic
transmission fluid temperature is high. This usually occurs when the
transmission is overfilled and may be accompanied by leakage of fluid from
the transmission breather hose.
The indicator light should turn on when the engine control switch is
turned to the "ON" position, but should go out after a few seconds.
If this light comes on while you are driving, slow down and pull off the road.
Stop the vehicle at a safe place and put the shift lever into the "P"
position. With the engine idling, wait until the light goes off. If the light
goes off, you can drive the vehicle again. If the light does not go off,
have the automatic transmission lubricating system checked as soon
as possible by your Isuzu dealer.
NOTICE: To avoid automatic transmission fluid overheating in
sustained low speed driving applications, be sure to use the "1"
position only. Examples of sustained low speed driving
applications are Road Sweepers, Road Marking Machinery, Trash
Collectors, etc.
CAUTION: Driving with the "A/T OIL TEMP" light constantly on can
cause serious mechanical damage to the automatic transmission.

Daytime Running Lights (DRL) Indicator Light

When you start the engine in daytime, with the lighting switch
off, and release the parking brake, the low beam headlights will
come on at a reduced brightness. This type of lighting is called "Daytime
Running Lights" or "DRL".
When the DRL are on, a green indicator light with the DRL symbol will
be lit on the instrument panel. This is to indicate that the DRL are on.
It will go out when the lighting switch is turned on.
The low beam lights will switch to full brightness and the exterior
lights will come on when the lighting switch is on. When the lighting
switch is off, the parking, side marker and tail lights will turn off and the
low beam lights will switch to the reduced brightness of DRL again.
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