Honda ACCORD HYBRID 2005 Service Manual page 2051

Navigation Function
The navigation system is c o m p o s e d of the navigation unit, the PCM (vehicle speed signal), the GPS antenna,
microphone, voice control switch, audio unit, climate control unit, and the display unit.
Function Diagram
G P S A N T E N N A
D e t e c t i o n of
t r a v e l d i s t a n c e
N A V I G A T I O N U N I T
G P S R E C E I V E R
D e t e c t i o n of
v e h i c l e p o s i t i o n
Y A W R A T E S E N S O R
D e t e c t i o n of
d i r e c t i o n c h a n g e
V O I C E C O N T R O L S W I T C H M I C R O P H O N E A U D I O U N I T
G P S t u n i n g
P e r c e p t i o n of
v e h i c l e p o s i t i o n
C o r r e c t i o n of
m a p m a t c h i n g
A u d i o
g u i d a n c e
D a t a p r o c e s s
c o n c e r n i n g m a p
a n d v e h i c l e p o s i t i o n
M a p s c r o l l
C h a n g e of r e d u c e d
s c a l e of m a p
G u i d e
p r o c e s s i n g
D I S P L A Y U N I T
Vehicle Speed Pulse
The vehicle speed pulse is sent by the PCM. The PCM recieves a signal f r o m the countershaft speed sensor, then it
processes the signal and transmits it to the speedometer and other systems.
N A V I G A T I O N UNIT
> - S e n s o r p o w e r
D I S T A N C E
D E T E C T I O N
C I R C U I T
Charge Signal
The PCM sends a charge signal to the navigation unit via F-CAN. A thermister inside the navigation unit m o n i t o r s the
units internal temperature. This i n f o r m a t i o n c o m b i n d w i t h charge signal determines the control units internal cooling
fan operation.
PCM
A A A A A A A A A A A A A
F A N C O N T R O L
L O G I C
PCM
/ v
V V
V
V V V V V V V V
F A N C O N T R O L
L O G I C
(cont'd)
23-85