Last Modified: 11-20-2023 |
6.11:8.1.0 |
Doc ID: RM100000001E83Z |
Model Year Start: 2019 |
Model: Camry HV |
Prod Date Range: [09/2018 - 10/2020] |
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM: C1425,P0573; Open in Stop Switch Circuit; 2019 - 2020 MY Camry HV [09/2018 - 10/2020] |
DTC
|
C1425
|
Open in Stop Switch Circuit
|
DTC
|
P0573
|
Brake Switch "A" Circuit High
|
DESCRIPTION
The skid control ECU (brake booster with master cylinder assembly) detects the brake operating conditions through a signal transmitted by the stop light switch assembly.
The skid control ECU incorporates a circuit to detect an open circuit. This DTC is output when an open circuit is detected in the stop light signal input line.
DTC No.
|
Detection Item
|
INF Code
|
DTC Detection Condition
|
Trouble Area
|
MIL
|
Note
|
C1425
|
Open in Stop Switch Circuit
|
231
|
An open stop light switch circuit continues for 10 seconds or more.
|
-
Wire harness or connector
-
Stop light switch assembly
-
Skid control ECU (brake booster with master cylinder assembly)
-
Stop light circuit
|
Comes on
|
-
INF Code 231: SAE Code P0572
-
Electronically controlled brake system DTC
|
P0573
|
Brake Switch "A" Circuit High
|
-
|
The stop light switch assembly is stuck 10 times or more.
|
-
Wire harness or connector
-
Stop light switch assembly
-
Skid control ECU (brake booster with master cylinder assembly)
|
Comes on
|
-
|
MONITOR DESCRIPTION
When the voltage at terminal STP is outside the range of that when the stop light switch assembly is on or the range of that when the stop light switch assembly is off for a certain amount of time, the skid control ECU (brake booster with master cylinder assembly) judges that there is an open in the stop light switch assembly circuit and illuminates the MIL and stores a DTC.
Also, if the voltage at terminal STP is always within the range of that when the stop light switch assembly is on after the vehicle is driven at a certain speed or more and stopped a specific number of times, the skid control ECU (brake booster with master cylinder assembly) judges that the stop light switch assembly is stuck on and illuminates the MIL and stores a DTC.
MONITOR STRATEGY
Related DTCs
|
P0572: Stop light switch assembly open circuit
P0573: Stop light switch assembly circuit high
|
Required Sensors/Components(Main)
|
Stop light switch assembly
Speed sensor
|
Required Sensors/Components(Related)
|
Skid control ECU (brake booster with master cylinder assembly)
|
Frequency of Operation
|
Continuous
|
Duration
|
10 seconds: P0572
10 times: P0573
|
MIL Operation
|
Immediately
|
Sequence of Operation
|
None
|
TYPICAL ENABLING CONDITIONS
All
Monitor runs whenever the following DTCs are not stored
|
None
|
P0572
Both of the following conditions are met
|
-
|
Serial communication with high side IC
|
Valid
|
IG1 voltage
|
Higher than 9.54 V
|
P0573
Serial communication with high side IC
|
Valid
|
TYPICAL MALFUNCTION THRESHOLDS
P0572
Stop light switch assembly voltage
|
Higher than 2.75 V, and less than 4.25 V
|
P0573
Stop light switch assembly voltage when decelerating vehicle from 30 km/h (19 mph) or more to 3 km/h (2 mph)
|
4.25 V or more
|
COMPONENT OPERATING RANGE
P0572
All of the following conditions are met
|
-
|
Stop light switch assembly on experience
|
On
|
Stop light switch assembly off experience
|
On
|
Stop light switch assembly voltage
|
2.75 V or less, or 4.25 V or more
|
P0573
Both of the following conditions are met
|
-
|
Serial communication with high side IC
|
Valid
|
Stop light switch assembly voltage
|
2.75 V or less
|
CONFIRMATION DRIVING PATTERN
-
Connect the Techstream to the DLC3.
-
Turn the power switch on (IG).
-
Turn the Techstream on.
-
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
-
Turn the power switch off.
-
Turn the power switch on (READY).
-
Turn the Techstream on.
-
Decelerate the vehicle from a speed of 30 km/h (19 mph) or more to 3 km/h (2 mph) 10 times or more.
-
Enter the following menus: Chassis / ABS/VSC/TRAC / Trouble Codes.
-
Read the DTCs.
HINT:
-
If a DTC is output, the system is malfunctioning.
-
If a DTC is not output, perform the following procedure.
-
If the DTCs are not output, perform a universal trip and check for permanent DTCs.
Click here
HINT:
-
If a permanent DTC is output, the system is malfunctioning.
-
If no permanent DTCs are output, the system is normal.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
-
After replacing the skid control ECU (brake booster with master cylinder assembly), perform linear solenoid valve offset learning, ABS holding solenoid valve learning, yaw rate and acceleration sensor zero point calibration and system information memorization after performing "Reset Memory".
Click here
-
Inspect the fuses for circuits related to this system before performing the following procedure.
PROCEDURE
1.
|
CHECK STOP LIGHT OPERATION
|
(a) Check that the stop lights come on when the brake pedal is depressed.
Result
|
Proceed to
|
All stop lights illuminate when the brake pedal is depressed and turn off when the brake pedal is released.
|
A
|
All stop lights do not illuminate when the brake pedal is depressed.
|
B
|
One or more stop lights illuminate when the brake pedal is depressed but remain on when the brake pedal is released.
|
C
|
A
|
|
|
2.
|
READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH ASSEMBLY)
|
(a) Select the Data List on the Techstream.
Chassis > ABS/VSC/TRAC > Data List
Tester Display
|
Measurement Item
|
Range
|
Normal Condition
|
Diagnostic Note
|
Stop Light SW
|
Stop light switch assembly
|
ON or OFF
|
ON: Brake pedal depressed
OFF: Brake pedal released
|
-
|
Chassis > ABS/VSC/TRAC > Data List
Tester Display
|
Stop Light SW
|
(b) Check the value of Stop Light SW when the brake pedal is depressed.
Result
|
Proceed to
|
The value of Stop Light SW is ON.
|
A
|
Other than above.
|
B
|
A
|
|
|
3.
|
STOP LIGHT SWITCH ASSEMBLY OUTPUT CIRCUIT INSPECTION
|
(a) Turn the power switch off.
|
|
*a
|
Component with harness connected
(Stop Light Switch Assembly)
|
|
|
(b) Make sure that there is no looseness at the locking part and the connecting part of the connector.
OK:
The connector is securely connected.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
|
Condition
|
Specified Condition
|
A37-1 (OUT) - Body ground
|
-
Power switch on (IG)
-
The headlights are on
-
The blower motor switch is in the HI position
-
The rear window defogger is turned on
-
Stop light switch assembly off (Brake pedal released)
|
1.5 V or less
|
OK
|
|
|
(a) Clear the DTCs.
Chassis > ABS/VSC/TRAC > Clear DTCs
NEXT
|
|
|
(a) Turn the power switch off.
(b) Turn the power switch on (READY).
(c) Perform a road test.
(d) Check if the same DTC is output.
Chassis > ABS/VSC/TRAC > Trouble Codes
Result
|
Proceed to
|
DTCs C1425 and P0573 are not output.
|
A
|
DTCs C1425 and/or P0573 are output.
|
B
|
6.
|
CHECK STOP LIGHT SWITCH ASSEMBLY
|
(a) Turn the power switch off.
(b) Make sure that there is no looseness at the locking part and the connecting part of the connector.
OK:
The connector is securely connected.
(c) Disconnect the A37 stop light switch assembly connector.
|
|
*a
|
Front view of wire harness connector
(to Stop Light Switch Assembly)
|
|
|
(d) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(e) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
|
Condition
|
Specified Condition
|
A37-1 (OUT) - Body ground
|
Stop light switch assembly off
(Brake pedal released)
|
1.5 V or less
|
NG
|
|
|
7.
|
CHECK BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY
|
(a) Make sure that there is no looseness at the locking part and the connecting part of the connector.
OK:
The connector is securely connected.
(b) Disconnect the A40 skid control ECU (brake booster with master cylinder assembly) connector.
|
|
*a
|
Front view of wire harness connector
(to Stop Light Switch Assembly)
|
|
|
(c) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(d) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
|
Condition
|
Specified Condition
|
A37-1 (OUT) - Body ground
|
Stop light switch assembly off
(Brake pedal released)
|
1.5 V or less
|
NG
|
|
|
8.
|
CHECK FOR SHORT TO +B IN STP CIRCUIT
|
(a) Check that there is no short to +B in the STP circuit (wire harnesses, connectors and stop lights).
OK:
No short to +B.
NG |
|
REPAIR OR REPLACE MALFUNCTIONING PART
|
9.
|
CHECK HARNESS AND CONNECTOR (STP TERMINAL)
|
(a) Turn the power switch off.
|
|
*a
|
Front view of wire harness connector
(to Skid Control ECU (Brake Booster with Master Cylinder Assembly))
|
|
|
(b) Make sure that there is no looseness at the locking part and the connecting part of the connector.
OK:
The connector is securely connected.
(c) Disconnect the A40 skid control ECU (brake booster with master cylinder assembly) connector.
(d) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(e) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
|
Condition
|
Specified Condition
|
A40-12 (STP) - Body ground
|
Stop light switch assembly on
(Brake pedal depressed)
|
11 to 14 V
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT)
|
10.
|
CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - STOP LIGHT)
|
(a) Check that there is no open in the wire harnesses and connectors from terminal OUT of the stop light switch assembly to the stop lights.
OK:
No open.
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
|