Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Stop Lamp Relay Actuator Stuck Off (C13807F)

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Brake / Brake Control / Dynamic Control Systems / Vehicle Stability Control System / Stop Lamp Relay Actuator Stuck Off (C13807F)

DESCRIPTION

Refer to DTC C13807E.

Click here

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C13807F

Stop Lamp Relay Actuator Stuck Off

Either of the following is detected:

  • When the IG1 terminal voltage exceeds 10 V and the +BS terminal voltage is from 9.5 to 17.4 V, stop light drive output (STPO) is ON, STP is OFF and STP2 is OFF continuously for 2 seconds or more.
  • When the IG1 terminal voltage exceeds 10 V and the +BS terminal voltage is 9.5 V or higher, stop light drive output (STPO) is OFF, STP is ON and STP2 is OFF continuously for 5 seconds or more.
  • Wire harness and connector
  • Semiconductor PWR integration ECU
  • Skid control ECU (Brake actuator assembly)
  • Rear light assembly LH
  • Rear combination light assembly LH
  • Rear light assembly RH
  • Rear combination light assembly RH
  • Center stop light assembly
DTC Detection Conditions: C13807F
 

Vehicle Condition

Pattern 1

Pattern 2

Diagnosis Condition

IG1 terminal voltage exceeds 10 V and +BS terminal voltage is from 9.5 to 17.4 V

○

-

IG1 terminal voltage exceeds 10 V and +BS terminal voltage is 9.5 V or higher

-

○

Malfunction Status

Stop light drive output (STPO) is ON, STP is OFF and STP2 is OFF

○

-

Stop light drive output (STPO) is OFF, STP is ON and STP2 is OFF

-

○

Detection Time

2 seconds or more.

5 seconds or more.

Number of Trips

1 trip

1 trip

HINT:

DTC will be output when conditions for either of the patterns in the table above are met.

WIRING DIAGRAM

Refer to DTC C13807E.

Click here

CAUTION / NOTICE / HINT

NOTICE:

After replacing the skid control ECU (brake actuator assembly), perform "Calibration".

Click here

PROCEDURE

1.

CHECK STOP LIGHT OPERATION

(a) Check that the stop lights come on when the brake pedal is depressed.

OK:

The stop lights illuminate.

NG

GO TO STEP 6

OK

2.

PERFORM ACTIVE TEST USING TECHSTREAM (STOP LAMP RELAY)

(a) Connect the Techstream to the DLC3.

(b) Enter the following menus: Chassis / Brake/EPB / Active Test.

Chassis > Brake/EPB > Active Test

Tester Display

Measurement Item

Control Range

Restrict Condition

Diagnostic Note

Stop Lamp Relay

Semiconductor PWR integration ECU (STPO terminal output)

OFF / ON

Vehicle condition: Vehicle stopped

HINT:

To protect this Actuator and Solenoid, this test will only last 5 seconds.

-
Chassis > Brake/EPB > Active Test

Tester Display

Stop Lamp Relay

(c) According to the display on the Techstream, perform the Active Test and check the operation of the stop lights.

OK:

Stop lights turn on in accordance with the Active Test.

NG

GO TO STEP 4

OK

3.

CHECK HARNESS AND CONNECTOR (STOP LIGHT SIGNAL INPUT CIRCUIT)

(a) Turn the engine switch off.

*a

Front view of wire harness connector

(to Skid Control ECU (Brake Actuator Assembly))

(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.

OK:

The connector is securely connected.

(c) Disconnect the A41 skid control ECU (brake actuator 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

A41-37 (STP2) - Body ground

Brake pedal depressed

11 to 14 V
OK

REPLACE BRAKE ACTUATOR ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.

CHECK HARNESS AND CONNECTOR (STOP LIGHT ILLUMINATION OUTPUT CIRCUIT)

(a) Turn the engine switch off.

*a

Front view of wire harness connector

(to Skid Control ECU (Brake Actuator Assembly))

(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.

OK:

The connector is securely connected.

(c) Disconnect the A41 skid control ECU (brake actuator assembly) connector.

(d) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

(e) Turn the engine switch on (IG).

(f) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

A41-32 (STPO) - Body ground

Engine switch on (IG)

11 to 14 V
OK

REPLACE BRAKE ACTUATOR ASSEMBLY

NG

5.

CHECK HARNESS AND CONNECTOR (SEMICONDUCTOR PWR INTEGRATION ECU - BRAKE ACTUATOR ASSEMBLY)

(a) Turn the engine switch off.

(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.

OK:

The connector is securely connected.

(c) Disconnect the 1D semiconductor PWR integration ECU connector.

(d) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

(e) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

1D-3 (ACC) - A41-32 (STPO)

Always

Below 1 Ω
OK

REPLACE SEMICONDUCTOR PWR INTEGRATION ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.

READ VALUE USING TECHSTREAM (STOP LIGHT RELAY)

(a) Turn the engine switch off.

(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.

OK:

The connector is securely connected.

(c) Disconnect the S31 rear combination light assembly LH connector.

(d) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

(e) Turn the engine switch on (IG).

(f) Connect the Techstream to the DLC3.

(g) Enter the following menus: Chassis / Brake/EPB / Data List.

Chassis > Brake/EPB > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Stop Light Relay

Semiconductor PWR integration ECU

(STP2 terminal input)

OFF / ON

OFF: Semiconductor PWR integration ECU (STP2 terminal input) OFF

ON: Semiconductor PWR integration ECU (STP2 terminal input) ON

HINT:

The stop light state is determined using the voltage at terminal STP2
Chassis > Brake/EPB > Data List

Tester Display

Stop Light Relay

(h) With the brake pedal released, check the value of Data List item "Stop Light Relay".

Result

Proceed to

The value of Data List item "Stop Light Relay" is "OFF"

A

The value of Data List item "Stop Light Relay" is "ON"

B
A

GO TO LIGHTING SYSTEM (REAR COMBINATION LIGHT ASSEMBLY LH (STOP LIGHT CIRCUIT))

B

7.

READ VALUE USING TECHSTREAM (STOP LIGHT RELAY)

(a) Turn the engine switch off.

(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.

OK:

The connector is securely connected.

(c) Disconnect the S33 rear combination light assembly RH connector.

(d) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

(e) Turn the engine switch on (IG).

(f) Connect the Techstream to the DLC3.

(g) Enter the following menus: Chassis / Brake/EPB / Data List.

Chassis > Brake/EPB > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Stop Light Relay

Semiconductor PWR integration ECU

(STP2 terminal input)

OFF / ON

OFF: Semiconductor PWR integration ECU (STP2 terminal input) OFF

ON: Semiconductor PWR integration ECU (STP2 terminal input) ON

HINT:

The stop light state is determined using the voltage at terminal STP2
Chassis > Brake/EPB > Data List

Tester Display

Stop Light Relay

(h) With the brake pedal released, check the value of Data List item "Stop Light Relay".

Result

Proceed to

The value of Data List item "Stop Light Relay" is "OFF"

A

The value of Data List item "Stop Light Relay" is "ON"

B
A

GO TO LIGHTING SYSTEM (REAR COMBINATION LIGHT ASSEMBLY RH (STOP LIGHT CIRCUIT))

B

8.

READ VALUE USING TECHSTREAM (STOP LIGHT RELAY)

(a) Turn the engine switch off.

(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.

OK:

The connector is securely connected.

(c) Disconnect the Z21 rear light assembly LH connector.

(d) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

(e) Turn the engine switch on (IG).

(f) Connect the Techstream to the DLC3.

(g) Enter the following menus: Chassis / Brake/EPB / Data List.

Chassis > Brake/EPB > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Stop Light Relay

Semiconductor PWR integration ECU

(STP2 terminal input)

OFF / ON

OFF: Semiconductor PWR integration ECU (STP2 terminal input) OFF

ON: Semiconductor PWR integration ECU (STP2 terminal input) ON

HINT:

The stop light state is determined using the voltage at terminal STP2
Chassis > Brake/EPB > Data List

Tester Display

Stop Light Relay

(h) With the brake pedal released, check the value of Data List item "Stop Light Relay".

Result

Proceed to

The value of Data List item "Stop Light Relay" is "OFF"

A

The value of Data List item "Stop Light Relay" is "ON"

B
A

GO TO LIGHTING SYSTEM (REAR LIGHT ASSEMBLY LH (STOP LIGHT CIRCUIT))

B

9.

READ VALUE USING TECHSTREAM (STOP LIGHT RELAY)

(a) Turn the engine switch off.

(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.

OK:

The connector is securely connected.

(c) Disconnect the Z20 rear light assembly RH connector.

(d) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

(e) Turn the engine switch on (IG).

(f) Connect the Techstream to the DLC3.

(g) Enter the following menus: Chassis / Brake/EPB / Data List.

Chassis > Brake/EPB > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Stop Light Relay

Semiconductor PWR integration ECU

(STP2 terminal input)

OFF / ON

OFF: Semiconductor PWR integration ECU (STP2 terminal input) OFF

ON: Semiconductor PWR integration ECU (STP2 terminal input) ON

HINT:

The stop light state is determined using the voltage at terminal STP2
Chassis > Brake/EPB > Data List

Tester Display

Stop Light Relay

(h) With the brake pedal released, check the value of Data List item "Stop Light Relay".

Result

Proceed to

The value of Data List item "Stop Light Relay" is "OFF"

A

The value of Data List item "Stop Light Relay" is "ON"

B
A

GO TO LIGHTING SYSTEM (REAR LIGHT ASSEMBLY RH (STOP LIGHT CIRCUIT))

B

10.

READ VALUE USING TECHSTREAM (STOP LIGHT RELAY)

(a) Turn the engine switch off.

(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.

OK:

The connector is securely connected.

(c) Disconnect the v1 center stop light assembly connector.

(d) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

(e) Turn the engine switch on (IG).

(f) Connect the Techstream to the DLC3.

(g) Enter the following menus: Chassis / Brake/EPB / Data List.

Chassis > Brake/EPB > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Stop Light Relay

Semiconductor PWR integration ECU

(STP2 terminal input)

OFF / ON

OFF: Semiconductor PWR integration ECU (STP2 terminal input) OFF

ON: Semiconductor PWR integration ECU (STP2 terminal input) ON

HINT:

The stop light state is determined using the voltage at terminal STP2
Chassis > Brake/EPB > Data List

Tester Display

Stop Light Relay

(h) With the brake pedal released, check the value of Data List item "Stop Light Relay".

Result

Proceed to

The value of Data List item "Stop Light Relay" is "OFF"

A

The value of Data List item "Stop Light Relay" is "ON"

B
A

REPLACE CENTER STOP LIGHT ASSEMBLY

B

11.

CHECK HARNESS AND CONNECTOR (SEMICONDUCTOR PWR INTEGRATION ECU - BRAKE ACTUATOR ASSEMBLY)

(a) Turn the engine switch off.

*a

Front view of wire harness connector

(to Skid Control ECU (Brake Actuator Assembly))

(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.

OK:

The connector is securely connected.

(c) Disconnect the A41 skid control ECU (brake actuator 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

A41-37 (STP2) - Body ground

Brake pedal depressed

11 to 14 V
OK

REPLACE BRAKE ACTUATOR ASSEMBLY

NG

12.

CHECK HARNESS AND CONNECTOR (SEMICONDUCTOR PWR INTEGRATION ECU - BRAKE ACTUATOR ASSEMBLY)

(a) Make sure that there is no looseness at the locking part and the connecting part of the connectors.

OK:

The connector is securely connected.

(b) Disconnect the 1D semiconductor PWR integration ECU connector.

(c) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

(d) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

1D-10 (STP) - A41-11 (STP)

Always

Below 1 Ω
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

13.

CHECK HARNESS AND CONNECTOR (SEMICONDUCTOR PWR INTEGRATION ECU - BRAKE ACTUATOR ASSEMBLY)

(a) Make sure that there is no looseness at the locking part and the connecting part of the connectors.

OK:

The connector is securely connected.

(b) Disconnect the 1F semiconductor PWR integration ECU connector.

(c) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

(d) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

1F-9 (OUT) - A41-37 (STP2)

Always

Below 1 Ω

1F-9 (OUT) or A41-37 (STP2) - Body ground and other terminals

Always

10 kΩ or higher
OK

REPLACE SEMICONDUCTOR PWR INTEGRATION ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
    Stop Lamp Relay Actuator Stuck On (C13807E)
    DESCRIPTION When any of the following conditions are met, the skid control ECU (brake actuator assembly) sets the drive output (STPO) ON which operates the stop light control relay (stop light switch ...

    ABS Solenoid Control Module Actuator Stuck On (C143A7E,C143A7F)
    DESCRIPTION The ABS solenoid relay is built into the skid control ECU in the brake actuator assembly. The ABS solenoid relay supplies power to the holding solenoid and reduction solenoid. The solenoid ...

    Other materials:

    Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Can Communication System: Clearance Warning ECU Communication Stop Mode
    DESCRIPTION Detection Item Symptom Trouble Area Clearance Warning ECU Communication Stop Mode Either condition is met: "Clearance Warning (Intuitive Parking Assist)" is not displayed on the CAN Bus Check screen of the Techstream. Click here Communication system DTCs (DTCs that ...

    Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Dynamic Radar Cruise Control System: Internal Control Module Software Incompatibility Not Programmed (U030051)
    DESCRIPTION If the forward recognition camera cannot verify the vehicle information sent from the ECM, the forward recognition camera stores DTC U030051. DTC No. Detection Item DTC Detection Condition Trouble Area MIL DTC Output from U030051 Internal Control Module Software Incomp ...

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual

    © 2025 Copyright www.lexusrx.net
    0.0169