Honda ACCORD HYBRID 2005 Service Manual page 700

IMA System
S y s t e m D e s c r i p t i o n ( c o n t ' d )
Junction board
The j u n c t i o n board, located next to the battery m o d u l e , distributes high voltage energy to the IMA system. The
contactors, " Y " capacitor, bypass resistor, A/C compressor driver fuse, and the battery current sensor are all on the
junction board.
B Y P A S S R E S I S T O R
B A T T E R Y C U R R E N T S E N S O R
Contactors
The high voltage contactor and bypass contactor are connected at the positive ( + ) output side of battery m o d u l e .
These contactors are controlled by the M C M , connecting the IMA battery to the high voltage circuits. The current f l o w s
t h r o u g h the bypass contactor and bypass resistor first.
DC-DC Converter
Instead of using an alternator to maintain the 12 V battery, the electrical system uses a DC-DC converter. The converter
converts high voltage direct current into low voltage direct current w i t h little energy loss.
The DC-DC converter will illuminate the charging system indicator in the gauge assembly if a p r o b l e m is detected in
the 12 V charging system.
The DC-DC converter has a t e m p e r a t u r e m o n i t o r i n g system that w i l l signal the M C M if its t e m p e r a t u r e is a b n o r m a l l y
high. If needed, the M C M can signal the DC-DC converter to shut d o w n .
Heat generated by the DC-DC converter is exhausted to the trunk c o m p a r t m e n t by the IPU m o d u l e f a n .
The DC-DC converter can also generate PGM-FI and/or IMA DTCs.
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