B1472

AIR CONDITIONING: AIR CONDITIONING SYSTEM: B1472: A/C Inverter High Voltage Output System Malfunction

DTC B1472 - A/C Inverter High Voltage Output System Malfunction

DESCRIPTION

The high voltage is output from the A/C inverter to the electric inverter compressor for driving the motor. Compressor control is stopped and the DTC is output if there is an open or short to ground in the output circuit.
The output DTC is memorized as previous trouble. Compressor control remains stopped unless the past and current DTCs are cleared by Techstream.
CAUTION: Wear insulated gloves and pull out the service plug grip before inspection as procedures may require disconnecting high-voltage connectors.
HINT: The hybrid vehicle system and air conditioning system output DTCs separately. Inspect DTCs following the flowchart for the hybrid system first if any DTCs from those systems are output simultaneously.





NOTE: The A/C inverter is integrated with the inverter with converter. It is necessary to replace the PCU box if the A/C inverter (inverter with converter) needs to be replaced because the A/C inverter (inverter with converter) cannot be replaced alone.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK ELECTRIC INVERTER COMPRESSOR




(a) Remove the service plug grip.
CAUTION: Because the compressor has a high-voltage circuit, wear insulated gloves and pull out the service plug to cut the high-voltage circuit before inspection.
(b) Disconnect the C4 electric inverter compressor connector.
(c) Measure the resistance of the inverter compressor immediately after the compressor is stopped.
Standard resistance:






NG -- REPLACE ELECTRIC INVERTER COMPRESSOR
OK -- REPLACE A/C INVERTER