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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Dtc Check / Clear
DTC CHECK / CLEAR CHECK DTC (a) Check main body ECU (multiplex network body ECU) (1) Connect the Techstream to the DLC3. (2) Turn the power switch on (IG). (3) Turn the Techstream on. (4) Enter the following menus: Body Electrical / Main Body / Trouble Codes. (5) Check for DTCs. Body Electrical >
Installation
INSTALLATION PROCEDURE 1. INSTALL FUEL PUMP CONTROL ECU ASSEMBLY Click here 2. INSTALL PARKING BRAKE ECU ASSEMBLY (a) Install the parking brake ECU assembly with the 2 bolts. Torque: 8.0 N·m {82 kgf·cm, 71 in·lbf} (b) Connect the 3 connectors. 3. INSTALL DECK TRIM SIDE PANEL ASSEMBLY LH Click
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