Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Stop Lamp Relay Actuator Stuck On (C13807E)

Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual / Brake / Brake Control / Dynamic Control Systems / Vehicle Stability Control System / 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 assembly) and turns on the stop lights.

Illumination Conditions:
  • Pre-collision brake is operating.
  • The dynamic radar cruise control system is operating and is applying the brakes.
  • Secondary collision brake is operating.
  • Brake hold is operating.
  • The parking brake is engaged while the vehicle is being driven.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C13807E

Stop Lamp Relay Actuator Stuck On

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 OFF and STP2 is ON 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

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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

Click here

PROCEDURE

1.

CHECK STOP LIGHT ILLUMINATION STATUS

(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) Turn the engine switch on (IG).

(e) Check the illumination status of the brake lights.

Result

Proceed to

The stop lights are illuminated.

A

The stop lights are not illuminated.

B
B

GO TO STEP 9

A

2.

READ VALUE USING TECHSTREAM (STOP LIGHT RELAY)

(a) Turn the engine switch off.

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

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

OK:

The connector is securely connected.

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

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

OK:

No deformation or corrosion.

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

(g) Connect the Techstream to the DLC3.

(h) 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

(i) 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 SEMICONDUCTOR PWR INTEGRATION ECU

B

3.

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

4.

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

5.

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

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 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

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 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

8.

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) 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

A41-37 (STP2) - Body ground

Engine switch on (IG)

0 V
OK

REPLACE BRAKE ACTUATOR ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

9.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

1D-3 (ACC) or A41-32 (STPO) - Body ground and other terminals

Always

10 kΩ or higher
OK

REPLACE BRAKE ACTUATOR ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
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