Dtc P0504 Brake Switch A / B Correlation
Engine. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK STOP LIGHT (OPERATION OF STOP LIGHT)
READ VALUE USING INTELLIGENT TESTER (STP SIGNAL AND ST1 - VOLTAGE)
INSPECT STOP LIGHT SWITCH ASSEMBLY
CHECK ECM (STP, ST1 - VOLTAGE)
DTC P0504 Brake Switch "A" / "B" Correlation |
DTC P0724 Brake Switch "B" Circuit High |
DESCRIPTION
The stop light switch is a duplex system that transmits two signals: STP and ST1-. These two signals are used by the ECM to monitor whether or not the brake system is working properly. If the signals, which indicate the brake pedal is being depressed and released, are detected simultaneously, the ECM interprets this as a malfunction in the stop light switch and sets the DTC.- HINT:
- The normal conditions are as shown in the table below. The signals can be read using an intelligent tester.
Signal
| Brake Pedal Released
| In Transition
| Brake Pedal Depressed
|
STP
| OFF
| ON
| ON
|
ST1-
| ON
| ON
| OFF
|
DTC No.
| DTC Detection Condition
| Trouble Area
|
P0504
| Conditions (a), (b) and (c) continue for 0.5 seconds or more
(1 trip detection logic):
(a) Ignition switch to the ON position
(b) Brake pedal released
(c) STP signal OFF when ST1- signal OFF
| - Short in stop light switch signal circuit
- Stop light switch
- ECM
|
P0724
| The stop light switch remains ON even when the vehicle is driven in a STOP (less than 2 mph (3 km/h)) and GO (19 mph (30 km/h) or more) fashion 5 times. (2 trip detection logic)
| - Short in stop light switch signal circuit
- Stop light switch
- ECM
|
WIRING DIAGRAM
INSPECTION PROCEDURE
- HINT:
- Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air-fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction (RAV4_ACA30 RM000000PDS09FX.html).
| 1.CHECK STOP LIGHT (OPERATION OF STOP LIGHT) |
Check whether the stop lights turn on and off normally when the brake pedal is depressed and released.
- OK:
- Stop lights turn ON when brake pedal is depressed.
| | REPAIR OR REPLACE STOP LIGHT SWITCH CIRCUIT |
|
|
| 2.READ VALUE USING INTELLIGENT TESTER (STP SIGNAL AND ST1 - VOLTAGE) |
Connect the intelligent tester to the DLC3.
Turn the ignition switch to the ON position and turn the tester on.
Enter the following menus: Powertrain / Engine and ECT / Data List / Stop Light Switch.
Check the STP signal when the brake pedal is depressed and released.
- OK:
Brake Pedal Operation
| Specified Condition
|
Depressed
| STP signal ON
|
Released
| STP signal OFF
|
Enter the following menus: Powertrain / Engine and ECT / Data List / ST1.
Check the ST1 signal when the brake pedal is depressed and released.
- OK:
Brake Pedal Operation
| Specified Condition
|
Depressed
| ST1 signal OFF
|
Released
| ST1 signal ON
|
| 3.INSPECT STOP LIGHT SWITCH ASSEMBLY |
Remove the stop light switch assembly.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
Switch Position
| Tester Connection
| Specified Condition
|
Switch pin released
| 1 - 2
| Below 1 Ω
|
Switch pin released
| 3 - 4
| 10 kΩ or higher
|
Switch pin pushed
| 1 - 2
| 10 kΩ or higher
|
Switch pin pushed
| 3 - 4
| Below 1 Ω
|
Reinstall the stop light switch assembly.
| 4.CHECK ECM (STP, ST1 - VOLTAGE) |
Disconnect the ECM connector.
Measure the voltage according to the value(s) in the table below.
- Standard voltage:
Tester Connection
| Brake Pedal Operation
| Specified Condition
|
STP (A12-36) - Body ground
| Depressed
| 9 to 14 V
|
STP (A12-36) - Body ground
| Released
| 0 to 3 V
|
ST1- (A12-35) - Body ground
| Depressed
| 0 to 3 V
|
ST1- (A12-35) - Body ground
| Released
| 9 to 14 V
|
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
