Hand-held tester:

CHECK OPERATION OF STOP LIGHT
1. Check if the stop lights go on and off normally when the brake pedal is depressed and released.
1. NG: REPAIR OR REPLACE STOP LIGHT SWITCH ASSY
2. OK: Go to next step.
INSPECT STOP LIGHT SWITCH ASSY
1. Check the resistance between the terminals when the switch is turned ON and OFF.
  Standard:
  
  Fig 1: Terminals Specified Condition Table
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 2: Checking Resistance Between Terminal When Switch Is Turned ON Or OFF
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: REPLACE STOP LIGHT SWITCH ASSY
2. OK: Go to next step.

READ VALUE OF HAND-HELD TESTER (STP SIGNAL)

Select the item "DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / STOP LIGHT SW" and read its value displayed on the hand-held tester.

Standard:

BRAKE PEDAL SPECIFIED CONDITION

Brake Pedal	Specified Condition
Depressed	STP Signal ON
Released	STP Signal OFF

Fig 3: Checking Brake Pedal Depressed/Released Position

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - ECM)

Check the resistance between the wire harness side connectors.

Standard (Check for open):

CONNECTOR (OPEN) SPECIFIED CONDITION

Tester Connection	Specified Condition
Stop light switch (S7-1) - STP (E5-19)	Below 1 Ω

Fig 4: Identifying Stop Light Switch Connector Wire Harness Side

Standard (Check for short):

CONNECTOR (SHORT) SPECIFIED CONDITION

Tester Connection	Specified Condition
Stop light switch (S7-1) or STP (E5-19) - Body ground	10 kΩ or higher

Reconnect the ECM connector.
Reconnect the stop light switch connector.

Fig 5: Disconnecting E5 ECM Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002