Inspection Procedure

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Select the Data List mode on the Techstream.

   ABS/VSC/TRAC 

   DATA LIST REFERENCE
   
   

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

   OK: ON (brake pedal is depressed) appears on the screen. 

NG:  Go to step  3

OK: Go to Next Step 

1. Clear the DTC (See DTC CHECK/CLEAR  ).
2. Check if the same DTC is output (See DTC CHECK/CLEAR  ).

   Result 

   RESULT REFERENCE
   
   

   Result	Proceed to
   DTC is output	A
   DTC is not output	B

B: CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION)  (See HOW TO PROCEED WITH TROUBLESHOOTING )

A: REPLACE VSC ACTUATOR ASSEMBLY  (See REMOVAL  )

1. Remove the STOP fuse from the engine room relay block.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance 

   RESISTANCE REFERENCE
   
   

   Tester Connection	Condition	Specified Condition
   STOP fuse	Always	Below 1 Ω

NG: CHECK FOR SHORTS IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE 

Fig 1: Identifying Stop Fuse

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to Next Step 

1. Remove the stop light control relays (BRK NO. 1 and BRK NO. 2) from the engine room relay block.
   Fig 2: Identifying Engine Room Relay Block

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.
   Fig 3: Identifying Relay

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance 

   for BRK NO. 1 

   RESISTANCE REFERENCE
   
   

   Tester Connection	Switch Condition	Specified Condition
   3 - 4	When battery voltage is not applied to terminals 1 and 2	Below 1 Ω
   3 - 5	When battery voltage is not applied to terminals 1 and 2	10 kΩ or higher
   3 - 4	When battery voltage is applied to terminals 1 and 2	10 kΩ or higher
   3 - 5	When battery voltage is applied to terminals 1 and 2	Below 1 Ω

   for BRK NO. 2 

   VOLTAGE SPECIFICATION
   
   

   Tester Connection	Switch Condition	Specified Condition
   3 - 4	When battery voltage is not applied to terminals land 2	Below 1 Ω
   	When battery voltage is applied to terminals 1 and 2	10 kΩ or higher

NG: REPLACE STOP LIGHT CONTROL RELAY 

OK: Go to Next Step 

1. Disconnect the A4 switch connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance 

   RESISTANCE REFERENCE
   
   

   Tester Connection	Switch Condition	Specified Condition
   1 - 2	Pin not pushed	Below 1 Ω
   	Pin pushed	10 kΩ or higher
   3 - 4	Pin not pushed
   	Pin pushed	Below 1 Ω

NG: REPLACE STOP LIGHT SWITCH ASSEMBLY  (See REMOVAL )

Fig 4: Identifying A4 Switch Connector Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to Next Step 

1. Disconnect the A19 ECU connector.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage 

   VOLTAGE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   A19-11 (STP2) - Body ground	Brake pedal depressed	8 to 14 V
   A19-11 (STP2) - Body ground	Brake pedal released	Below 4.0 V
   A19-41 (STP) - Body ground	Brake pedal depressed	8 to 14 V
   A19-41 (STP) - Body ground	Brake pedal released	Below 4.0 V

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

Fig 5: Identifying A19 ECU Connector Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: REPLACE VSC ACTUATOR ASSEMBLY  (See REMOVAL  )