Inspection Procedure

1. Remove the stop light control relays from the engine room relay block.
2. Turn the ignition switch to ON.
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage 

   VOLTAGE SPECIFICATION
   
   

   Tester Connection	Switch Condition	Specified Condition
   Stop light control relay terminal 1 (BRK NO. 1)-Body ground	Ignition switch ON	11 to 14 V
   Stop light control relay terminal 1 (BRK NO. 2) - Body ground

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

Fig 1: Identifying Engine Room Relay Block

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.
2. Measure the resistance according to the value(s) in the table below.
   Fig 2: 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 land 2	Below 1 Ω
   3 - 5	When battery voltage is not applied to terminals land 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 A19 ECU connector.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage 

   VOLTAGE SPECIFICATION
   
   

   Tester Connection	Switch Condition	Specified Condition
   A19-35 (BSW) - Body ground	Ignition switch ON	11 to 14 V

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

Fig 3: Identifying A19 ECU Connector Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: REPLACE VSC ACTUATOR ASSEMBLY  (See REMOVAL  )