Lexus NX: Invalid Data Received from HVAC Control Module (U0424-537)
DESCRIPTION
If there is a malfunction in the air conditioning amplifier assembly, DTC U0424-537 will be stored.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Warning Indicate |
|---|---|---|---|---|---|
| U0424-537 | Invalid Data Received from HVAC Control Module | Air conditioning amplifier assembly malfunction: The hybrid vehicle control ECU receives a communication error signal from the air conditioning amplifier assembly. (1 trip detection logic) | Air conditioning amplifier assembly | Does not come on | Master Warning Light: Does not come on |
CAUTION / NOTICE / HINT
HINT:
After the repair, clear the DTCs and perform the following procedure to check that DTCs are not output.
- Wait for 1 minute or more with the vehicle stopped, the power switch on (READY), the shift lever in P, and the air conditioning system on (Lo/COOL MAX, blower speed HI).
PROCEDURE
| 1. | CHECK DTC OUTPUT (AIR CONDITIONER) |
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Enter the following menus: Body Electrical / Air Conditioner / Trouble Codes.
(d) Check if DTCs related to the air conditioning system (A/C) are output.
Body Electrical > Air Conditioner > Trouble Codes(e) Turn the power switch off.
| DTCs related to A/C are not output. | .gif) | REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY |
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| DTCs related to A/C are output. | | GO TO DTC CHART (AIR CONDITIONING SYSTEM) |
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Removal
REMOVAL CAUTION / NOTICE / HINT HINT:
Use the same procedure for the RH and LH sides.
The procedure described below is for the LH side.
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DESCRIPTION F
