Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Brake Switch "A" Signal Compare Failure (P057162)
DESCRIPTION
When the brake pedal is depressed, the stop light switch assembly outputs a signal to the ECM. The ECM uses this signal to control cancellation of vehicle speed by the dynamic radar cruise control. When the ECM determines that terminals STP and ST1 of the stop light switch assembly are both less than 1 V, DTC P057162 is stored.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | DTC Output from |
|---|---|---|---|---|---|
| P057162 | Brake Switch "A" Signal Compare Failure | When the engine switch is on (IG) and the dynamic radar cruise control system is operating, the ECM detects that the voltage at terminal STP and ST1- are both less than 1 V for approximately 0.5 seconds or more. |
| Does not come on | Cruise Control |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
- Inspect the fuses for circuits related to this system before performing the following procedure.
-
Before replacing the ECM, refer to Registration.
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PROCEDURE
| 1. | CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - BATTERY AND BODY GROUND) |
| (a) Disconnect the A55 stop light switch assembly connector. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| A55-3 (GND) - Body ground | Always | Below 1 Ω |
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| A55-1 (B) - Body ground | Always | 11 to 14 V |
| A55-5 (B) - Body ground | Engine switch on (IG) | 11 to 14 V |
| A55-5 (B) - Body ground | Engine switch off | Below 1 V |
| NG | .gif) | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
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| 2. | INSPECT STOP LIGHT SWITCH ASSEMBLY |
(a) Inspect the stop light switch assembly.
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| NG | | REPLACE STOP LIGHT SWITCH ASSEMBLY |
|
| 3. | CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - ECM) |
(a) Disconnect the A55 stop light switch assembly connector.
(b) Disconnect the A37 ECM connector.
(c) Disconnect each ECU connector.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| A55-2 (L) - A37-27 (STP) | Always | Below 1 Ω |
| A55-4 (L) - A37-42 (ST1-) | Always | Below 1 Ω |
| A55-2 (L) or A37-27 (STP) - Body ground | Always | 10 kΩ or higher |
| A55-4 (L) or A37-42 (ST1-) - Body ground | Always | 10 kΩ or higher |
| OK | | REPLACE ECM |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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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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