Inspection Procedure

HINT:

Before performing the inspection procedure, depress the brake pedal and check that the stop lights come on. If the stop lights do not come on, See PROBLEM SYMPTOMS TABLE .

1. READ VALUE OF TECHSTREAM 
   1. Connect Techstream to the DLC3.
   2. Turn the engine switch on (IG) and press Techstream main switch on.
   3. Read the Data List according to the displays on the tester.

      Power Source Control: 

      DIAGNOSTIC NOTE CHART
      
      

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

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

      Result 

      RESULT CHART
      
      

      Condition	Proceed to
      NG	C
      OK (When troubleshooting according to the PROBLEM SYMPTOM TABLE)	B
      OK (When troubleshooting according to the DTC chart)	A

   B : PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

   C: Go to step 2 

   A : REPLACE POWER SOURCE CONTROL ECU 

2. INSPECT STOP LIGHT SWITCH ASSEMBLY 
   1. Disconnect the stop light switch assembly connector.
   2. Measure the resistance according to the value(s) in the table below.

      Resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Switch condition	Tester connection	Specified value
      Switch pin free	1 - 2	Below 1 Ω
      Switch pin free	3 - 4	10 kΩ or higher
      Switch pin pushed in	1 - 2	10 kΩ or higher
      Switch pin pushed in	3 - 4	Below 1 Ω

      Fig 1: Inspecting Stop Light Switch Assembly

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPLACE STOP LIGHT SWITCH ASSEMBLY 

   OK: Go to next step 

3. CHECK WIRE HARNESS (STOP LIGHT SWITCH - POWER SOURCE CONTROL ECU AND BATTERY) 
   1. Disconnect the A23 switch connector.
      Fig 2: Identifying A23 Switch Connector

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Disconnect the D44 ECU connector.
   3. Measure the resistance according to the value(s) in the table below.

      Resistance 

      TERMINAL SPECIFIED CONDITION CHART
      
      

      Terminal No. (Symbol)	Specified Condition
      A23-1 - D44-1 (STP)	Below 1 Ω
      A23-1 - Body ground	10 kΩ or higher

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   Fig 3: Disconnecting D44 ECU Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK : REPLACE POWER SOURCE CONTROL ECU