Toyota Prius 2010 Repair Manual page 133

DTC B1477/77 A/C Inverter Low Voltage Power Resource System Malfunction
DESCRIPTION
The compressor with motor assembly monitors the controlling power voltage in the circuit. It stops the
compressor circuit and stores the DTC when the monitored voltage is outside the specified range.
The output DTC is memorized as previous trouble. The compressor control may not resume unless the power
switch is turned off.
DTC No.
An open or short to ground in the inverter controlling power
B1477/77
voltage circuit.
INSPECTION PROCEDURE
CAUTION:
Wear electrically insulated gloves and pull out the service plug grip before inspection as procedures may
require disconnecting high-voltage connectors. Be sure to carry the removed service plug grip because
other workers may install it by mistake.
Do not touch the high-voltage connectors or terminals for 10 minutes after the service plug grip is
removed.
NOTICE:
The hybrid control system and air conditioning system output DTCs separately. Inspect DTCs following the
flow chart for the hybrid control system first if any DTCs from those systems are output simultaneously.
PROCEDURE
1. CHECK CAN COMMUNICATION SYSTEM
(a) Using the Techstream to check if the CAN communication system is functioning normally.
Result:
CAN DTC is not output
CAN DTC is output
B GO TO CAN COMMUNICATION SYSTEM
A REPLACE COMPRESSOR WITH MOTOR ASSEMBLY
2010 Toyota Prius
DTC Detection Condition
Result
Trouble Area
Compressor with motor
assembly
CAN communication system
Proceed to
A
B
Repair Manual