DTC C1380/64: Stop Light Control Relay Malfunction [10/2014 - 10/2015]: Procedure

1. Check that the stop lights come on when the brake pedal is depressed and go off when the brake pedal is released.

   OK

   Condition	Illumination Condition
   Brake pedal depressed.	On
   Brake pedal released.	Off

Result: 

NG 

INSPECT LIGHTING SYSTEM (STOP LIGHT CIRCUIT) 

(Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2014 - 10/2015] )

Result: 

OK 

See step  2

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Select the Data List on the Techstream (Refer to DATA LIST / ACTIVE TEST [10/2014 - 10/2015] ).
   ABS/VSC/TRAC
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Stop Light SW	Stop light switch assembly / ON or OFF	ON: Brake pedal depressed OFF: Brake pedal released	-

4. Check that the stop light switch assembly condition observed on the Techstream changes according to brake pedal operation.

   OK

   The Techstream displays ON or OFF according to brake pedal operation.

Result: 

NG 

See step  8

Result: 

OK 

See step  3

1. Select the Active Test on the Techstream (Refer to DATA LIST / ACTIVE TEST [10/2014 - 10/2015] ).
   ABS/VSC/TRAC
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   Stop Light Relay	Stop light control relay (Stop light switch assembly)	Relay (Switch) ON/OFF	Stop lights come on

2. Perform the Active Test of the stop light control relay (stop light switch assembly) using the Techstream.
3. Select the Data List on the Techstream (Refer to DATA LIST / ACTIVE TEST [10/2014 - 10/2015] ).
   ABS/VSC/TRAC
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Stop Light Relay Output	Stop light control relay (Stop light switch assembly) output / ON or OFF	ON: Relay (Switch) output on OFF: Relay (Switch) output off	-

4. Check for stop light control relay (stop light switch assembly) operation using the Data List and stop light operation by performing the Active Test.

   Result

   Result	Proceed to
   Data List content and stop light operation are normal.	A
   Data List content and stop light operation are abnormal or Data List content is normal but stop lights do not turn on or off.	B

Result: 

B 

See step  6

Result: 

A 

See step  4

1. Turn the power switch off.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Make sure that there is no looseness at the locking part and the connecting part of the connector.
3. Disconnect the A51 skid control ECU (brake booster with master cylinder assembly) connector.
4. Measure the voltage according to the value (s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A51-6 (STP2) - Body ground	Stop light switch assembly ON (Brake pedal depressed)	11 to 14 V
   A51-6 (STP2) - Body ground	Stop light switch assembly OFF (Brake pedal released)	Below 1.5 V
   A51-33 (STP) - Body ground	Stop light switch assembly ON (Brake pedal depressed)	11 to 14 V
   A51-33 (STP) - Body ground	Stop light switch assembly OFF (Brake pedal released)	Below 1.5 V

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT) 

Result: 

OK 

See step  5

1. Reconnect the A51 skid control ECU (brake booster with master cylinder assembly) connector.
2. Clear the DTCs (Refer to DTC CHECK / CLEAR [10/2014 - ] ).
3. Turn the power switch on (READY).
4. Perform a road test.
5. Check if the same DTC is output (Refer to DTC CHECK / CLEAR [10/2014 - ] ).

   Result

   Result	Proceed to
   DTC C1380/64 is not output.	A
   DTC C1380/64 is output.	B

Result: 

A 

USE SIMULATION METHOD TO CHECK 

(Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2014 - 10/2015] )

Result: 

B 

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY 

(Refer to REMOVAL [10/2014 - ] )

1. Turn the power switch off.
2. Check the stop light control relay (stop light switch assembly) (Refer to ON-VEHICLE INSPECTION [10/2014 - ] ).

   OK

   The stop light control relay (stop light switch assembly) is normal.

Result: 

NG 

REPLACE STOP LIGHT SWITCH ASSEMBLY 

(Refer to REMOVAL [10/2014 - ] )

Result: 

OK 

See step  7

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Disconnect the A51 skid control ECU (brake booster with master cylinder assembly) connector.
3. Turn the power switch on (IG).
4. Measure the voltage according to the value (s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A51-3 (STP0) - Body ground	Power switch on (IG)	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

Result: 

OK 

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY 

(Refer to REMOVAL [10/2014 - ] )

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (STP0 CIRCUIT) 

1. Turn the power switch off.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Make sure that there is no looseness at the locking part and the connecting part of the connector.
3. Disconnect the A51 skid control ECU (brake booster with master cylinder assembly) connector.
4. Measure the voltage according to the value (s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A51-33 (STP) - Body ground	Stop light switch assembly ON (Brake pedal depressed)	11 to 14 V
   A51-33 (STP) - Body ground	Stop light switch assembly OFF (Brake pedal released)	Below 1.5 V

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

Result: 

OK 

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY 

(Refer to REMOVAL [10/2014 - ] )

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT)