Toyota Yaris: Dynamic Radar Cruise Control System / 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 | DTC Output from |
|---|---|---|---|---|
| P057162 | Brake Switch "A" Signal Compare Failure | When the ignition switch is ON 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. |
| Radar Cruise1 |
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 Service Bulletin.
PROCEDURE
| 1. | CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - BODY GROUND) |
(a) Disconnect the A63 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 |
|---|---|---|
| A63-2 (GND) - Body ground | Always | Below 1 Ω |
(c) Connect the A63 stop light switch assembly connector.
| NG |
 | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 2. | CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - AUXILIARY BATTERY) |
(a) Disconnect the stop light switch assembly connector.
| (b) Measure the voltage according to the value(s) in the table below. Standard Voltage:
|
|
(c) Connect the A63 stop light switch assembly connector.
| NG |
 | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 3. | INSPECT STOP LIGHT SWITCH ASSEMBLY |
Click here
| NG |
 | REPLACE STOP LIGHT SWITCH ASSEMBLY |
|
| 4. | CHECK HARNESS AND CONNECTOR (ECM - STOP LIGHT SWITCH ASSEMBLY) |
(a) Disconnect the A106 ECM connector.
(b) Disconnect the A63 stop light switch assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| A106-22 (ST1-) - A63-5 (L) | Always | Below 1 Ω |
| A106-21 (STP) - A63-3 (L) | Always | Below 1 Ω |
| A106-22 (ST1-) or A63-5 (L) - Body ground | Always | 10 kΩ or higher |
| A106-21 (STP) or A63-3 (L) - Body ground | Always | 10 kΩ or higher |
(d) Connect the A63 stop light switch assembly connector.
(e) Connect the A106 ECM connector.
| OK |
 | REPLACE ECM |
| NG |
 | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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Break-In Period
No special break-in is necessary, but a few precautions in the first 600 miles (1,000 km) may add to the performance, economy, and life of the vehicle.
Do not race the engine. Do not maintain one constant speed, either slow or fast, for a long period of time. Do not drive constantly at full-throttle or high engine rpm for extended periods of time. Avoid unnecessary hard stops. Avoid full-throttle starts.