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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A/C Inverter Cooling / Heating System Malfunction (B1475)
DESCRIPTION The temperature sensor of the compressor with motor assembly detects the A/C inverter temperature. If the temperature exceeds the maximum, operation of the compressor with motor assembly w
A/C Inverter Load System Malfunction (B1476)
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.
A/C Inverter Low Voltage Power Resource System Malfunction (B1477)
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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Replacement
REPLACEMENT CAUTION / NOTICE / HINT NOTICE:
When the brake pedal is first depressed after replacing the brake pads or pushing back the disc brake piston, DTC C1214 may be output. As there is no malfunction, clear the DTC.
While the auxiliary battery is connected, even if the power switch is off
Removal
REMOVAL PROCEDURE 1. REMOVE FRONT BUMPER ASSEMBLY Click here 2. REMOVE NO. 3 ENGINE ROOM WIRE Click here 3. REMOVE CLEARANCE LIGHT ASSEMBLY LH Click here 4. REMOVE CLEARANCE LIGHT ASSEMBLY RH HINT: Use the same procedure described for the LH side. 5. REMOVE HOOD TO FRONT END PANEL SEAL Click h
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