DTC C1380/64: Stop Light Control Relay Malfunction [08/2013 - ]: 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

NG → See step   12 

OK: Go to next step 

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 [08/2013 - ] .
   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.

NG → See step   8 

OK: Go to next step 

1. Select the Active Test on the Techstream. Refer to DATA LIST / ACTIVE TEST [08/2013 - ] .
   ABS/VSC/TRAC
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   Stop Light Relay	No. 1 integration relay	Relay ON/OFF	Stop lights come on

2. Perform the Active Test of the No. 1 integration relay (engine room junction block assembly) using the Techstream.
3. Select the Data List on the Techstream. Refer to DATA LIST / ACTIVE TEST [08/2013 - ] .
   ABS/VSC/TRAC
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Stop Light Relay Output	No. 1 integration relay output / ON or OFF	ON: Relay output on OFF: Relay output off	-

4. Check for No. 1 integration relay (engine room junction block assembly) operation using the Data List and stop light operation by performing an 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

B → See step   6 

A: Go to next step 

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 A24 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
   A24-6 (STP2) - Body ground	Stop light switch assembly ON (Brake pedal depressed)	11 to 14 V
   A24-6 (STP2) - 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))

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (STP2 CIRCUIT) 

OK: Go to next step 

1. Reconnect the A24 skid control ECU (brake booster with master cylinder assembly) connector.
2. Clear the DTCs. Refer to DTC CHECK / CLEAR [08/2013 - ] .
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 [08/2013 - ] .

   Result

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

B → See step   11 

A → See step   9 

1. Turn the power switch off.
2. Check the No. 1 integration relay (engine room junction block assembly). Refer to ON-VEHICLE INSPECTION [08/2013 - ] .

   OK

   The No. 1 integration relay (engine room junction block assembly) is normal.

NG → See step   10 

OK: Go to next step 

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 A24 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
   A24-3 (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))

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (STP0 CIRCUIT) 

OK → See step   11 

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 A24 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
   A24-33 (STP) - Body ground	Stop light switch assembly ON (Brake pedal depressed)	11 to 14 V
   A24-33 (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))

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT) 

OK → See step   11