DESCRIPTION
When the brake pedal is depressed, the stop light switch assembly sends a signal to the ECM. When the ECM receives this signal, it cancels the dynamic radar cruise control. The fail-safe function operates to enable normal driving even if there is a malfunction in the stop light signal circuit. The cancellation condition occurs when voltage is applied to terminal STP. When the brake is applied, voltage is normally applied to terminal STP of the ECM through the STOP fuse and the stop light switch assembly, and the ECM turns the dynamic radar cruise control system off.
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
MIL |
---|---|---|---|---|
P057162 |
Brake Switch "A" Signal Compare Failure |
While the ignition switch is ON and the dynamic radar cruise control system is operating, voltage of STP terminal and that of ST1- terminal of ECM are less than 1 V for approximately 0.5 seconds or more. |
|
Does not come on |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
w/o Smart Key System: Click here
w/ Smart Key System: Click here
PROCEDURE
1. |
CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - BATTERY AND BODY GROUND) |
(a) Disconnect the stop light switch assembly connector. |
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
S10-2 - Body ground |
Always |
11 to 14 V |
S10-4 - Body ground |
Ignition switch to ON |
11 to 14 V |
S10-4 - Body ground |
Ignition switch off |
Below 1 V |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
2. |
INSPECT STOP LIGHT SWITCH ASSEMBLY |
(a) Remove the stop light switch assembly.
Click here
(b) Inspect the stop light switch assembly.
Click here
NG | ![]() |
REPLACE STOP LIGHT SWITCH ASSEMBLY |
|
3. |
CHECK HARNESS AND CONNECTOR (ECM - STOP LIGHT SWITCH ASSEMBLY) |
(a) Disconnect the E13 ECM connector.
(b) Disconnect the S10 stop light switch assembly connector.
(c) Disconnect the S1 skid control ECU (master cylinder solenoid)*1 or skid control ECU (brake actuator assembly)*2 connector.
(d) Disconnect the S7 shift lock control unit connector.
(e) Remove the STOP relay from the engine room relay block.
(f) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
E13-15 (ST1-) - S10-3 |
Always |
Below 1 Ω |
E13-16 (STP) - S10-1 |
Always |
Below 1 Ω |
E13-15 (ST1-) or S10-3 - Body ground |
Always |
10 kΩ or higher |
E13-16 (STP) or S10-1 - Body ground |
Always |
10 kΩ or higher |
OK | ![]() |
REPLACE ECM |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
Removal
REMOVAL
PROCEDURE
1. REMOVE LOWER STEERING COLUMN COVER
2. REMOVE UPPER STEERING COLUMN COVER
3. REMOVE WINDSHIELD WIPER SWITCH ASSEMBLY
(a) Disconnect the 2 connectors.
Text in Illustration
*a
Protective Tape
...
Removal
REMOVAL
CAUTION / NOTICE / HINT
NOTICE:
When replacing the windshield glass of a vehicle equipped with a forward recognition
camera, make sure to use a Toyota genuine part. If a non-Toyota genuine part is
used, the forward recognition camera may not be able to be installed due to a missing
...
Transfer L4 Position Switch Circuit (C1268)
DESCRIPTION
A-TRAC is activated if wheel skid is detected while the transfer is in the L4
position.
DTC Code
DTC Detecting Condition
Trouble Areas
C1268
L4 detection switch signal input to skid control ECU (master cylinder
solenoid ...