Toyota Yaris: Vehicle Stability Control System / Stop Lamp Relay Actuator Stuck Off (C13807F)

Toyota Yaris XP210 (2020-2024) Reapir and Service Manual / Brake / Brake Control / Dynamic Control Systems / Vehicle Stability Control System / Stop Lamp Relay Actuator Stuck Off (C13807F)

DESCRIPTION

Refer to DTC C13807E.

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DTC No.

Detection Item

DTC Detection Condition

Trouble Area

DTC Output from

C13807F

Stop Lamp Relay Actuator Stuck Off

Either of the following is detected:

  • When the IGR 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 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 ON and STP2 is OFF 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

Refer to DTC C13807E.

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CAUTION / NOTICE / HINT

NOTICE:

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

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PROCEDURE

1.

CHECK STOP LIGHT OPERATION (FOR LED HEADLIGHT)

(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 GTS (STOP LAMP RELAY)

(a) Perform the Active Test of the stop light relay using the GTS.

Chassis > Brake > Active Test

Tester Display

Measurement Item

Restrict Condition

Diagnostic Note

Stop Lamp Relay

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 > Active Test

Tester Display

Stop Lamp Relay

(b) According to the display on the GTS, 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 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) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

A108-5 (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 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

A108-26 (STPO) - Body ground

Ignition switch ON

11 to 14 V
OK

REPLACE BRAKE ACTUATOR ASSEMBLY

NG

5.

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 A63 stop light switch 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

A63-4 (ACC) - A108-26 (STOP)

Always

Below 1 Ω
OK

REPLACE STOP LIGHT SWITCH ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.

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

7.

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

8.

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

9.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A108-5 (STP2) - Body ground

Brake pedal depressed

11 to 14 V
OK

REPLACE BRAKE ACTUATOR ASSEMBLY

NG

10.

CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - 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 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) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

A63-3 (L) - A108-5 (STP2)

Always

Below 1 Ω

A63-3 (L) or A108-5 (STP2) - Body ground and other terminals

Always

10 kΩ or higher
OK

REPLACE CENTER STOP LIGHT ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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