DTC C1380-7F: Stop Lamp Relay Actuator Stuck Off [12/2023 - ]: Procedure

Result

Result: 

B 

See step  11

Result: 

A 

See step  2

1. Perform the stop light control relay (No. 2 semiconductor power integration ECU) Active Test, and confirm that the stop lights illuminate and turn off and the value of "Stop Light SW", "Stop Light Relay" and "STPO" changes.

   Chassis > Brake/EPB > Active Test 

   Tester Display	Measurement Item	Control Range	Restrict Condition	Diagnostic Note
   Stop Lamp Relay	Stop light control relay (No. 2 semiconductor power integration ECU)	OFF / ON	Vehicle condition: Vehicle stopped HINT:  To protect this Actuator and Solenoid, this test will only last 5 seconds.	With the brake pedal released, check that the stop lights illuminate and the value of Stop Light Relay on the GTS changes to ON when Stop Lamp Relay is ON

   Chassis > Brake/EPB > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   Stop Light SW	Stop light switch assembly status (STP or STP2 terminal input)	OFF / ON	OFF: Brake pedal released ON: Brake pedal depressed	HINT:  Stop light control relay off: STP terminal status displayed. Stop light control relay on: STP2 terminal status displayed.

   Chassis > Brake/EPB > Active Test 

   Active Test Display
   Stop Lamp Relay

   Data List Display
   Stop Light SW

   Result

   Result	Proceed to
   The value of Stop Light SW is OFF	A
   The value of Stop Light SW is ON	B

Result: 

B 

REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

Result: 

A 

See step  3

1. Perform the stop light control relay (No. 2 semiconductor power integration ECU) Active Test, and confirm that the stop lights illuminate.

   Chassis > Brake/EPB > Active Test 

   Tester Display	Measurement Item	Control Range	Restrict Condition	Diagnostic Note
   Stop Lamp Relay	Stop light control relay (No. 2 semiconductor power integration ECU)	OFF / ON	Vehicle condition: Vehicle stopped HINT:  To protect this Actuator and Solenoid, this test will only last 5 seconds.	With the brake pedal released, check that the stop lights illuminate and the value of Stop Light Relay on the GTS changes to ON when Stop Lamp Relay is ON

   Chassis > Brake/EPB > Active Test 

   Tester Display
   Stop Lamp Relay

   Result

   Result	Proceed to
   The stop lights are not illuminated.	A
   The stop lights are illuminated.	B

Result: 

B 

See step  10

Result: 

A 

See step  4

Pre-procedure1

• Turn the ignition switch off.

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

  OK

  The connector is securely connected.

Pre-procedure2

• Disconnect the A6 No. 2 skid control ECU (brake actuator assembly) connector.

• Check both the connector case and the terminals for deformation and corrosion.

  OK

  No deformation or corrosion.

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

  Standard Voltage

  Tester Connection	Condition	Specified Condition	Result
  A6-32 (STPO) - Body ground	Always	11 to 14 V	V

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None

Result: 

NG 

See step  9

Result: 

OK 

See step  5

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

   OK

   The connector is securely connected.

2. Check both the connector case and the terminals for deformation and corrosion.

   OK

   No deformation or corrosion.

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition	Result
   A6-37 (STP2) - Body ground	Stop light switch assembly on (Brake pedal depressed)	11 to 14 V	V

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

Result: 

NG 

See step  6

1. Check that there is no short to ground in the STP2 circuit (wire harnesses, connectors, stop lights and ECUs)

   OK

   There is no short to ground.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE MALFUNCTIONING PART 

Result: 

OK 

See step  7

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

  OK

  The connector is securely connected.

Pre-procedure1

• Disconnect the G102 No. 2 semiconductor power integration ECU connector.

• Check both the connector case and the terminals for deformation and corrosion.

  OK

  No deformation or corrosion.

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

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  G102-1 (OUT) - A6-37 (STP2)	Always	Below 1 Ω	Ω

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  8

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

   OK

   The connector is securely connected.

2. Check both the connector case and the terminals for deformation and corrosion.

   OK

   No deformation or corrosion.

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition	Result
   G102-10 (STP) - A6-11 (STP)	Always	Below 1 Ω	Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE NO. 2 SEMICONDUCTOR POWER INTEGRATION ECU. Refer to  REMOVAL [12/2023 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

   OK

   The connector is securely connected.

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (No. 2 Semiconductor Power Integration ECU)

   Standard Voltage

   Tester Connection	Condition	Specified Condition	Result
   G102-14 (ACC) - Body ground	Always	11 to 14 V	V

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

NG 

REPLACE NO. 2 SEMICONDUCTOR POWER INTEGRATION ECU. Refer to  REMOVAL [12/2023 - ] 

Pre-procedure1

• Turn the ignition switch off.

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

  OK

  The connector is securely connected.

Pre-procedure2

• Disconnect the A6 No. 2 skid control ECU (brake actuator assembly) connector.

• Check both the connector case and the terminals for deformation and corrosion.

  OK

  No deformation or corrosion.

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

  Standard Voltage

  Tester Connection	Condition	Specified Condition	Result
  A6-37 (STP2) - Body ground	Stop light switch assembly on (Brake pedal depressed)	11 to 14 V	V

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None

Result: 

OK 

REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Check the DTCs that are output.

   Chassis > Brake/EPB > Trouble Codes 

   Result

   Result	Proceed to
   Only C1380-7F is output	A
   C1380-7F and other DTCs are output	B

Result: 

B 

REPAIR CIRCUITS INDICATED BY OUTPUT DTCS 

Result: 

A 

See step  12

1. Perform the stop light control relay (stop light switch assembly) Active Test, and confirm that the stop lights illuminate and turn off and the value of "Stop Light SW", "Stop Light Relay" and "STPO" changes.

   Chassis > Brake/EPB > Active Test 

   Tester Display	Measurement Item	Control Range	Restrict Condition	Diagnostic Note
   Stop Lamp Relay	Stop light control relay	OFF / ON	Vehicle condition: Vehicle stopped HINT:  To protect this Actuator and Solenoid, this test will only last 5 seconds.	With the brake pedal released, check that the stop lights illuminate and the value of Stop Light Relay on the GTS changes to ON when Stop Lamp Relay is ON

   Chassis > Brake/EPB > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   Stop Light SW	Stop light switch assembly status (STP terminal input)	OFF / ON	OFF: Brake pedal released ON: Brake pedal depressed	HINT:  Stop light control relay off: STP terminal status displayed. Stop light control relay on: STP terminal status displayed.
   Stop Light Relay	Stop light control relay status (STP terminal input)	OFF / ON	OFF: Stop light control relay off and brake pedal released ON: Stop light control relay on or brake pedal depressed	HINT:  The voltage of power supplied to the stop lights is measured at the STP terminal.
   STPO	Stop light control relay status (STPO terminal output)	OFF / ON	OFF: Stop light control relay off (Stop light off) ON: Stop light control relay on (Stop light on)	HINT:  When STPO is ON, the stop light control relay turns ON and the stop lights illuminate

   Chassis > Brake/EPB > Active Test 

   Active Test Display
   Stop Lamp Relay

   Data List Display
   Stop Light SW
   Stop Light Relay
   STPO

   Result

   Data List Status			Stop Light Illumination Status	Proceed to
   Stop Light SW	Stop Light Relay	STPO
   OFF	OFF	ON	Not illuminated	A
   OFF	OFF	ON	Illuminated	B
   ON	ON	ON	Illuminated	C

Result: 

B 

See step  18

Result: 

C 

See step  19

Result: 

A 

See step  13

Pre-procedure1

• Turn the ignition switch off.

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

  OK

  The connector is securely connected.

Pre-procedure2

• Disconnect the A6 No. 2 skid control ECU (brake actuator assembly) connector.

• Check both the connector case and the terminals for deformation and corrosion.

  OK

  No deformation or corrosion.

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

  Standard Voltage

  Tester Connection	Condition	Specified Condition	Result
  A6-32 (STPO) - Body ground	Always	11 to 14 V	V

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None

Result: 

NG 

See step  17

Result: 

OK 

See step  14

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition	Result
   A6-11 (STP) - Body ground	Stop light switch assembly on (Brake pedal depressed)	11 to 14 V	V

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

Result: 

NG 

See step  15

1. Check that there is no short to ground in the STP circuit (wire harnesses, connectors, stop lights and ECUs)

   OK

   There is no short to ground.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE MALFUNCTIONING PART 

Result: 

OK 

See step  16

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

  OK

  The connector is securely connected.

Pre-procedure1

• Disconnect the A98 stop light switch assembly connector.

• Check both the connector case and the terminals for deformation and corrosion.

  OK

  No deformation or corrosion.

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

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  A98-1 (OUT) - A6-11 (STP)	Always	Below 1 Ω	Ω

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None

Result: 

OK 

REPLACE STOP LIGHT SWITCH ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

   OK

   The connector is securely connected.

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (Stop Light Switch Assembly)

   Standard Voltage

   Tester Connection	Condition	Specified Condition	Result
   A98-4 (ACC) - Body ground	Always	11 to 14 V	V

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

NG 

REPLACE STOP LIGHT SWITCH ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

Pre-procedure1

• Turn the ignition switch off.

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

  OK

  The connector is securely connected.

Pre-procedure2

• Disconnect the A6 No. 2 skid control ECU (brake actuator assembly) connector.

• Check both the connector case and the terminals for deformation and corrosion.

  OK

  No deformation or corrosion.

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

  Standard Voltage

  Tester Connection	Condition	Specified Condition	Result
  A6-11 (STP) - Body ground	Stop light switch assembly on (Brake pedal depressed)	11 to 14 V	V

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None

Result: 

OK 

REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Pre-procedure1

• Turn the ignition switch off.

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

  OK

  The connector is securely connected.

Pre-procedure2

• Disconnect the A6 No. 2 skid control ECU (brake actuator assembly) connector.

• Check both the connector case and the terminals for deformation and corrosion.

  OK

  No deformation or corrosion.

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

  Standard Voltage

  Tester Connection	Condition	Specified Condition	Result
  A6-37 (STP2) - Body ground	Stop light switch assembly off (Brake pedal released)	Below 1.5 V	V

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None

Result: 

OK 

REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

Result: 

NG 

See step  20

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

  OK

  The connector is securely connected.

Pre-procedure1

• Disconnect the A98 stop light switch assembly connector.

• Check both the connector case and the terminals for deformation and corrosion.

  OK

  No deformation or corrosion.

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

  Standard Voltage

  Tester Connection	Condition	Specified Condition	Result
  A6-37 (STP2) - Body ground	Always	Below 1.5 V	V

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None

Result: 

OK 

REPLACE STOP LIGHT SWITCH ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

Result: 

NG 

See step  21

1. Check that there is no short to +B in the STP2 circuit (wire harnesses, connectors and ECUs).

   OK

   No short to +B.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2020 - ] 

Result: 

NG 

REPAIR OR REPLACE MALFUNCTIONING PART