Dash LCD not visible at night
#1
Dash LCD not visible at night
The dashboard LCD (odometer/fuel readings, etc) readout is visible during daylight hours, but not at night. Is this controlled by some mini-lights within the dash?
I'm reading the Electrical Diagnostic Manual and it states:
++++++++++++++++++++++++++++++++++++++++
Liquid Crystal Display
A single line, six digit, 7 segment display with six trip function flags used for odometer, trip computer and driver messages.
NOTE: If the instrument pack has not been PECUS programmed, the back illumination of the LCD will not switch on.
Check that a PECUS label is attached to the back of the pack.
++++++++++++++++++++++++++++++++++++++++
Could this be related to the "instrument pack not being PECUS programmed"? Why is that? If the "back illumination of the LCD" didnt work, would i not be able to see its read-out during the day?
All instruments work - all other dash instruments are illuminated as expected.
I'm reading the Electrical Diagnostic Manual and it states:
++++++++++++++++++++++++++++++++++++++++
Liquid Crystal Display
A single line, six digit, 7 segment display with six trip function flags used for odometer, trip computer and driver messages.
NOTE: If the instrument pack has not been PECUS programmed, the back illumination of the LCD will not switch on.
Check that a PECUS label is attached to the back of the pack.
++++++++++++++++++++++++++++++++++++++++
Could this be related to the "instrument pack not being PECUS programmed"? Why is that? If the "back illumination of the LCD" didnt work, would i not be able to see its read-out during the day?
All instruments work - all other dash instruments are illuminated as expected.
#3
But, just to be clear, when you say it's not visible at night, you make no reference to the car's lighting system. Do I take it that even when you switch the vehicle lights on, this part of the dashboard display does not illuminate? I presume the readout LCDs are there and working OK, just not illuminated when you turn on the lights - is that correct?
Have you any reason to believe that the problem is not quite simply a failure of one or more bulbs used to light up this section of the dash panel?
#4
But, just to be clear, when you say it's not visible at night, you make no reference to the car's lighting system. Do I take it that even when you switch the vehicle lights on, this part of the dashboard display does not illuminate? I presume the readout LCDs are there and working OK, just not illuminated when you turn on the lights - is that correct?
Have you any reason to believe that the problem is not quite simply a failure of one or more bulbs used to light up this section of the dash panel?
Have you any reason to believe that the problem is not quite simply a failure of one or more bulbs used to light up this section of the dash panel?
#5
Yes ... at night, when I turn on the road lights, all the dash lights illuminate, for all the gauges and speedo and tach, but the odometer LCD is black. I am assuming there are mini-lights around the LCD, as the clock LCD has? I've checked the electrical diagrams and can't verify.
#7
Thanks for the feedback - now that I know for sure, I'll give it a go. I'll also do another search in the archives for the procedure. Thanks again!
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