Toyota Yaris: Vehicle Stability Control System / Stop Lamp Relay Actuator Stuck On (C13807E)

Toyota Yaris XP210 (2020-2024) Reapir and Service 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 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.
  • The parking brake is engaged while the vehicle is being driven.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

DTC Output from

C13807E

Stop Lamp Relay Actuator Stuck On

When the IGR 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
  • Skid control ECU (brake actuator assembly)
  • Rear combination light lens and body LH
  • Rear combination light lens and body RH
  • Center stop light assembly

Brake

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 (FOR LED HEADLIGHT)

(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 A63 stop light switch assembly connector.

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

OK:

No deformation or corrosion.

(d) Turn the ignition switch to ON.

(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 7

A

2.

READ VALUE USING GTS (STOP LIGHT RELAY)

(a) Turn the ignition switch off.

(b) Reconnect the A63 stop light switch assembly 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) Operate the GTS to check the Data List.

Chassis > Brake > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Stop Light Relay

STP2 terminal input

OFF / ON

OFF: STP2 terminal input OFF

ON: STP2 terminal input ON

HINT:

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

Tester Display

Stop Light Relay

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

Result

Proceed to

The value of Stop Light Relay is OFF

A

The value of Stop Light Relay is ON

B
A

REPLACE STOP LIGHT SWITCH ASSEMBLY

B

3.

READ VALUE USING GTS (STOP LIGHT RELAY)

(a) Turn the ignition 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 O109 rear combination light lens and body LH connector.

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

OK:

No deformation or corrosion.

(e) Operate the GTS to check the Data List.

Chassis > Brake > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Stop Light Relay

STP2 terminal input

OFF / ON

OFF: STP2 terminal input OFF

ON: STP2 terminal input ON

HINT:

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

Tester Display

Stop Light Relay

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

Result

Proceed to

The value of Stop Light Relay is OFF

A

The value of Stop Light Relay is ON

B
A

GO TO LIGHTING SYSTEM

B

4.

READ VALUE USING GTS (STOP LIGHT RELAY)

(a) Turn the ignition 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 O110 rear combination light lens and body RH connector.

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

OK:

No deformation or corrosion.

(e) Operate the GTS to check the Data List.

Chassis > Brake > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Stop Light Relay

STP2 terminal input

OFF / ON

OFF: STP2 terminal input OFF

ON: STP2 terminal input ON

HINT:

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

Tester Display

Stop Light Relay

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

Result

Proceed to

The value of Stop Light Relay is OFF

A

The value of Stop Light Relay is ON

B
A

GO TO LIGHTING SYSTEM

B

5.

READ VALUE USING GTS (STOP LIGHT RELAY)

(a) Turn the ignition 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 g1 center stop light assembly connector.

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

OK:

No deformation or corrosion.

(e) Operate the GTS to check the Data List.

Chassis > Brake > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Stop Light Relay

STP2 terminal input

OFF / ON

OFF: STP2 terminal input OFF

ON: STP2 terminal input ON

HINT:

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

Tester Display

Stop Light Relay

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

Result

Proceed to

The value of Stop Light Relay is OFF

A

The value of Stop Light Relay is ON

B
A

REPLACE CENTER STOP LIGHT ASSEMBLY

B

6.

CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - BRAKE ACTUATOR ASSEMBLY)

(a) Turn the ignition 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 A108 skid control ECU (brake actuator assembly) connector.

*a

Front view of wire harness connector

(to Skid Control ECU (Brake Actuator Assembly))

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

OK:

No deformation or corrosion.

(e) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A108-5 (STP2) - Body ground

Ignition switch ON

0 V
OK

REPLACE BRAKE ACTUATOR ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.

CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - BRAKE ACTUATOR ASSEMBLY)

(a) Turn the ignition 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 A108 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 ignition switch to ON.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A63-4 (ACC) or A108-26 (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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