Honda ACCORD HYBRID 2005 Service Manual page 2033

S y m p t o m Diagnostic
Procedure
• Buttons stay bright and do not
adjust with dimmer
• LEDs do not dim with dimmer
off of full bright position
• LCD display or subdisplay is
full bright and does not adjust
with dimmer
• Lower panel ambient light may
or may not dim with dimmer
Go to step 6.
• Buttons do not light up
• LEDs do not dim
• LCD display or subdisplay is
full bright and does not adjust
with dimmer, or does not fully
dim
• Lower panel ambient light may
or may not dim with dimmer
Go to step 9.
• Lower panel ambient light
does not light up
• Buttons dim with dimmer
• LEDs dim with dimmer off of
full bright position
• LCD display dims with dimmer
Replace the
audio-HVAC
display
module
(see page
23-69). •
Symptom other than those listed
above
Replace the
audio-HVAC
display
module
(see page
23-69) •
6. Remove the audio-HVAC display module (see page
23-69) and check for loose wires terminals or poor
connections at audio unit connector A (20P).
Are all the wire terminals tight, and is audio unit
connector A (20P) connected properly?
Y E S — G o t o step 7.
NO—Repair the loose w i r e t e r m i n a l , or properly
connect audio unit connector A (20P), and recheck
the s y m p t o m . •
7. Turn the set/reset knob on the gauge control
module to the full bright position.
8. Measure the voltage between the No. 19 and
No. 20 terminals of audio unit connector A (20P).
Is there 0.1 V or less?
YES—Check connections at audio unit connector A
(20P). If connections are OK substitute a k n o w n -
g o o d audio-HVAC display m o d u l e and recheck the
s y m p t o m . If the s y m p t o m is gone, replace the
original audio-HVAC display m o d u l e . •
NO—Repair open in the RED w i r e between the
MICU and the audio-HVAC display module. •
9. Remove the audio-HVAC display m o d u l e (see page
23-69) and check for loose w i r e terminals or poor
connections at audio unit connector A (20P).
Are all the wire terminals tight, and is audio unit
connector A (20P) connected properly?
Y E S — G o t o step 10.
NO—Repair the loose w i r e t e r m i n a l , or properly
connect audio unit connector A (20P) and recheck
the s y m p t o m . •
10. W i t h the c o m b i n a t i o n light switch still O N , turn the
illumination control dial on the gauge control
module to the full bright position.
11. Measure the voltage between the No. 9 and No. 20
terminals of the audio unit connector A (20P).
Is there battery voltage?
YES—Check connections at the audio unit
connector A (20P). If connections are OK substitute
a k n o w n - g o o d audio-HVAC display m o d u l e and
recheck the s y m p t o m . If the s y m p t o m is gone,
replace the original audio-HVAC display module. •
NO — R e p a i r open in the RED/BLK w i r e between the
under-hood fuse/relay box and the audio-HVAC
display p a n e l . •
23-67