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
.gif)
-
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 |
READ NEXT:
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
SEE MORE:
Open or Short Circuit in Lock Switch Circuit (C13A3,C13AB)
DESCRIPTION When the electric parking brake switch (integration control and panel assembly) is pulled to the lock side, a lock request signal is output to the parking brake ECU assembly. DTC No. Detection Item DTC Detection Condition Trouble Area Memory Note C13A3 Open or Short Ci
Removal
REMOVAL CAUTION / NOTICE / HINT HINT:
Use the same procedure for the RH and LH sides.
The procedure listed below is for the LH side.
PROCEDURE 1. REMOVE REAR WHEEL Click here 2. DISCONNECT REAR SPEED SENSOR LH (a) w/o AVS: Click here (b) w/ AVS: Click here 3. REMOVE REAR SUSPENSION ARM
© 2016-2026 Copyright www.lexunx.com
