Honda ACCORD HYBRID 2005 Service Manual page 2077

Monitor Check
O v e r v i e w of display unit
• The display unit communicates w i t h the navigation
unit over its o w n GA-Net bus. Information is sent to
the navigation unit whenever the user activates the
touch screen, or buttons. Information sent by the
navigation unit to the display unit includes
c o m m a n d s to control the LCD back light.
• The display unit is protected by the security system
by daisy-chaining the security signal through it, and
then passing the signal to the audio unit.
• The illumination input f r o m the gauge brightness
control provides back lighting for the buttons
surrounding the screen.
• The display unit also communicates w i t h the climate
control unit to set the A/C, mode, and fan speed, and
to receive the outside temperature that is displayed
on the A/C-INFO screen.
These screens allow troubleshooting of the display unit.
Select the item you w a n t to troubleshoot, and f o l l o w
the diagnostic instructions.
( Monitor ] 1 Return |
RGB Color | Test Pattern J
Gray Tone
|Monitor Adjustment |
White Raster
[ Touch Panel H
Black Raster
RGB Color
This screen verifies that the display unit is receiving the
video (R, G, B and Composite sync) signals properly.
The three primary colors should all be s h o w n w i t h o u t
distortion. The combination of all three should produce
a central w h i t e section. If any of the colors are missing,
troubleshoot for the color signal (see page 23-128). If
the picture has lines in it, or scrolls horizontally or
vertically, troubleshoot for a Composite sync p r o b l e m
(see page 23-129).
Gray Tone
This screen looks for problems w i t h contrast. You
should be able to see the changes f r o m bar to bar
across the scale. It is normal for the 2 bars on either
side to a p p e a r t h e same.
f Gra^ 1 T o n e
Return
W h i t e Raster
The entire display must be shown in w h i t e .
[ White Raster } 1 Return |
(cont'd)
23-111