Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Cruise Control System Internal Failure (P057504,P057549)

DESCRIPTION

When the ECM detects an internal malfunction, DTC P057504 or P057549 is stored.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

DTC Output from

P057504

Cruise Control System Internal Failure

When the dynamic radar cruise control system is operating, the ECM detects a malfunction in the internal cancel circuit for 0.4 seconds or more.

ECM

Does not come on

Cruise Control

P057549

Cruise Control Internal Electronic Failure

When the dynamic radar cruise control system is operating, the ECM detects a malfunction in the internal STP signal circuit for 0.2 seconds or more.

ECM

Does not come on

Cruise Control

CAUTION / NOTICE / HINT

NOTICE:

Before replacing the ECM, refer to Registration.

Click here

PROCEDURE

1.

CHECK FOR DTCs

(a) Clear the DTCs.

Powertrain > Cruise Control > Clear DTCs

(b) Make sure that the DTC detection conditions are met.

HINT:

If the detection conditions are not met, the system cannot detect the malfunction.

(c) Check for DTCs.

Powertrain > Cruise Control > Trouble Codes

Result

Proceed to

DTC P057504 and P057549 are not output

A

DTC P057504 or P057549 is output

B

A

USE SIMULATION METHOD TO CHECK

B

REPLACE ECM

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    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual

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