Honda ACCORD HYBRID 2005 Service Manual page 1790

Multiplex Integrated Control System (MICS)
D T C T r o u b l e s h o o t i n g
DTC B1000: Communication Bus Line Error
1. Clear the DTCs using the HDS.
2. Cycle the ignition switch to OFF and then back ON.
3. Check for DTCs using the HDS.
Is DTC B1000 indicated?
Y E S — G o t o step 4.
NO—Intermittent failure. The c o m m u n i c a t i o n bus
line is OK at this t i m e . Check for loose or poor
connections. If the connections are g o o d , check the
battery condition (see page 22-71) and the charging
system. •
4. Check for DTCs using the HDS.
Are DTC B1005, B1006, B1007, B1008, B1009 and
B1010 indicated?
Y E S — G o t o step 5.
NO—Replace the M I C U . B
5. Disconnect each control unit one at a t i m e . Clear
the DTC, then recheck for DTCs after each unit is
disconnected.
• Gauge control module
• Relay control m o d u l e
• Driver's multiplex control unit
• Climate control unit
• Combination switch control unit
Is DTC B1000 indicated with each unit
disconnected?
DTC B1050, B1100, B1150, B1200, B1250:
Communication Bus Line Error
1. Clear the DTCs using the HDS.
2. Cycle the ignition switch to OFF and then back O N .
3. Check for DTCs using the HDS.
Are DTC(s) B1050, B1100, B1150, B1200 or B1250
indicated?
Y E S - G o to step 4.
NO—Intermittent failure, the system is OK at this
t i m e . •
B1050 Relay Control Module
B1100
Door Multiplex Control Unit
B1150
Gauge Control Module
B1200 Audio-HVAC Display Module
B1250 Combination Switch Control Unit
4. Check for DTCs using the HDS.
Is DTC(s) B1000 indicated?
Y E S - T r o u b l e s h o o t DTC B1000.B
NO—If DTC B1050 is indicated, replace the relay
control module. If DTC B1100 is indicated, replace
the door multiplex control unit. If DTC B1150 is
indicated, replace the gauge control module
(see page 22-235). If DTC1200 is indicated, replace
the climate control unit. If DTC B1250 is indicated,
replace the c o m b i n a t i o n switch control unit. B
YES—Check for a short to p o w e r or ground in the
c o m m u n i c a t i o n circuit by disconnecting the
harness at each control unit and testing for
continuity to g r o u n d or short to power. Repair or
replace the harness as necessary, fl
NO—Substitute a k n o w n - g o o d control unit w i t h the
one that was disconnected, and did not set DTC
B1000.B
22-108