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 INTELLIGENT TESTER 
   1. Connect the intelligent tester to the DLC3.
   2. Turn the engine switch on (IG) and press the intelligent tester main switch on.
   3. Read the Data List according to the displays on the tester.

   PWR SOURCE CTRL (Power source control ECU): 

   DATA LIST
   
   

   Item	Measurement Item / Display (Range)	Normal Condition	Diagnostic Note
   STOP LIGHT SW1	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
   
   

   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 below.

   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 

      Fig 1: Inspecting Stop Light Switch Assembly

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      RESISTANCE SPECIFICATION
      
      

      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

   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 Stop Light Switch Connector Terminals

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

      Resistance 

      RESISTANCE SPECIFICATION
      
      

      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 

   OK: REPLACE POWER SOURCE CONTROL ECU