Inspection Procedure

1. Check that the stop lights come on when the brake pedal is depressed and go off when the brake pedal is released.

Standard voltage 

NG:  Go to step  3

OK: Go to next step 

Fig 1: Identifying Skid Control ECU A4 Connector Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the skid control ECU connector.
2. Measure the voltage.

   Standard voltage: 

   Standard voltage:
   
   

   Tester Connection	Condition	Specified Condition
   A4-7 (STP) - Body ground	Stop light switch ON (Brake pedal depressed)	8 to 14 V
   A4-7 (STP) - Body ground	Stop light switch OFF (Brake pedal released)	Below 1.5 V

   Result:
   
   

   Result	Proceed to
   OK (When troubleshooting in accordance with DTC CHART)	A
   OK (When troubleshooting in accordance with PROBLEM SYMPTOMS TABLE)	B
   NG	C

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

   C: REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Clear the DTC.
2. Check if the same DTC is detected.
   Result:
   
   

   Result	Proceed to
   DTC output	A
   DTC not output	B

   A: REPLACE MASTER CYLINDER SOLENOID 

   B: END 

Fig 2: Identifying Terminals Of Stop Light Switch Assembly Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. Disconnect the stop light switch connector.
2. Measure the resistance.

   Standard resistance 

   RESISTANCE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   1 - 2	Switch pin released	Below 1 Ω
   3 - 4	Switch pin released	10 kΩ or higher
   1 - 2	Switch pin pushed in	10 kΩ or higher
   3 - 4	Switch pin pushed in	Below 1 Ω

NG: REPLACE STOP LIGHT SWITCH ASSEMBLY