Air Conditioning System (for Manual Air Conditioning System)

AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Manual Air Conditioning System): B1477/77: A/C Inverter Low Voltage Power Resource System Malfunction

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 outputs 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.
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 to prevent other technicians from accidentally reinstalling it.
- Do not touch the high-voltage connectors or terminals for 5 minutes after the service plug grip is removed.
- After removing the service plug grip, turning the power switch on (READY) may cause a malfunction. Do not turn the power switch on (READY) unless instructed by the repair manual.





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 to prevent other technicians from accidentally reinstalling it.
- Do not touch the high-voltage connectors or terminals for 5 minutes after the service plug grip is removed.

PROCEDURE

1. CHECK CAN COMMUNICATION SYSTEM
(a) Using the Techstream, check if the CAN communication system is functioning normally.
Result:






B -- GO TO CAN COMMUNICATION SYSTEM
A -- REPLACE COMPRESSOR WITH MOTOR ASSEMBLY