B1471

AIR CONDITIONING: AIR CONDITIONING SYSTEM: B1471/71: A/C Inverter High Voltage Power Resource System Malfunction
B1471/71 - A/C Inverter High Voltage Power Resource System Malfunction

DESCRIPTION

The A/C inverter assembly monitors power voltage from the main battery in the circuit. It stops compressor control and outputs the DTC when the monitored voltage is outside the specified range.

The output DTC is memorized as a past DTC. 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 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 flowchart for the hybrid control system first if any DTCs from those systems are output simultaneously.





WIRING DIAGRAM





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.
PROCEDURE

1. CHECK DTC (CAN COMMUNICATION SYSTEM)

(a) Use the Techstream to check if the CAN communication system is functioning normally.

Result





B -- GO TO CAN COMMUNICATION SYSTEM How to Proceed With Troubleshooting
A -- Continue to next step.

2. CHECK DTC (HYBRID CONTROL SYSTEM)

(a) Check if DTCs for the hybrid control system are output using the Techstream.

Result





B -- GO TO HYBRID CONTROL SYSTEM How To Proceed With Troubleshooting
A -- Continue to next step.

3. INSPECT HIGH VOLTAGE FUSE

(a) Turn the power switch off.

(b) Remove the service plug grip.

CAUTION:
* Be sure to wear insulated gloves.
* Do not touch the high-voltage connectors or terminals for 10 minutes after the service plug grip is removed.
NOTICE:
Do not start the engine with the service plug grip removed because it may cause a malfunction.

(c) Remove the connector cover assembly.

CAUTION:
Be sure to wear insulated gloves.

NOTICE:
Be sure to prevent foreign objects or water from entering the inverter with converter assembly.

(d) Check that bolts A and B are tightened securely.





(e) Measure the resistance according to the value(s) in the table below.

Standard resistance:





NG -- REPLACE HIGH VOLTAGE FUSE
OK -- Continue to next step.

4. INSPECT HEATER WIRE

(a) Disconnect the k1 and j1 heater wire connectors.





CAUTION:
Be sure to wear insulated gloves.

(b) Measure the resistance according to the value(s) in the table below.

Standard resistance:





NG -- REPLACE HEATER WIRE Removal

OK -- REPLACE COMPRESSOR WITH MOTOR ASSEMBLY Removal