Lexus RX (RX 350L, RX450h) 2016-2025 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.
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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 | .gif) | USE SIMULATION METHOD TO CHECK |
| B | | REPLACE ECM |
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
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