Lexus NX: A/C Inverter Malfunction (B1474)
Lexus NX Service Manual / Vehicle Interior / Heating / Air Conditioning / Air Conditioning System / A/C Inverter Malfunction (B1474)
DESCRIPTION
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Memory | Note |
|---|---|---|---|---|---|
| B1474 | A/C Inverter Malfunction | A/C inverter malfunction |
| Memorized | - |
CAUTION / NOTICE / HINT
CAUTION:
- Wear insulated gloves and pull out the service plug grip before inspection as procedures may require disconnecting high-voltage connectors. Carry the removed service plug in your pocket to prevent other technicians from accidentally reconnecting it while you are servicing the vehicle.
- Do not touch the high-voltage connectors or terminals for 10 minutes after the service plug grip is removed.
NOTICE:
-
After the power switch is turned off, there may be a waiting time before disconnecting the negative (-) auxiliary battery terminal.
Click here
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-
When disconnecting and reconnecting the auxiliary battery terminal
Click here
HINT:
When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.
Click here
- The hybrid control system and air conditioning system output DTCs separately. Perform troubleshooting for the hybrid control system first if DTCs from these systems are output simultaneously.
PROCEDURE
| 1. | CHECK CAN COMMUNICATION SYSTEM |
(a) Using the Techstream, check if the CAN communication system is functioning normally.
Click here
| Result | Proceed to |
|---|---|
| CAN communication system DTCs are not output | A |
| CAN communication system DTCs are output | B |
| A | .gif) | REPLACE COMPRESSOR WITH MOTOR ASSEMBLY |
| B | | GO TO CAN COMMUNICATION SYSTEM |
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DESCRIPTION The operation of the compressor with motor assembly is stopped and this DTC is stored if the rotation load is too large or too small while the compressor with motor assembly is operating.
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DESCRIPTION The compressor with motor assembly monitors the inverter control power voltage in the circuit. The hybrid vehicle control ECU stops the compressor control and stores this DTC when the moni
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Components
COMPONENTS ILLUSTRATION *1 DECK FLOOR BOX LH *2 NO. 3 DECK BOARD SUB-ASSEMBLY *3 REAR DECK FLOOR BOX *4 NEGATIVE AUXILIARY BATTERY TERMINAL N*m (kgf*cm, ft.*lbf): Specified torque - - ILLUSTRATION *1 BATTERY SERVICE HOLE COVER *2 HYBRID BATTERY SERVICE PLU
Removal
REMOVAL PROCEDURE 1. RECOVER REFRIGERANT FROM REFRIGERATION SYSTEM Click here 2. DRAIN ENGINE COOLANT Click here 3. DISCONNECT AIR CONDITIONER TUBE AND ACCESSORY ASSEMBLY (a) Remove the bolt and rotate the hook connector as shown in the illustration. (b) Disconnect the air cond
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