Inspection Procedure

1. Check that the stop light comes on when the brake pedal is depressed and goes off when the brake pedal is released.

HINT:

Check the stop lamp bulb because it may burnt out.

Standard: Stop lamp switch function is normal. 

NG: Go to step   4 

OK: Go to next step. 

1. Disconnect the skid control ECU connector S1.
   Fig 1: Disconnecting Skid Control ECU (STP Terminal)

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2. Measure the voltage according to the value(s) in Fig 2 .

   Standard 

   Fig 2: Measuring Voltage Between STP & Body Ground Specifications Chart

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NG: Go to step   4 

OK: Go to next step. 

1. Clear the DTCs. (see PRE-CHECK  )
2. Turn the ignition switch to the ON position.
3. Are the same DTCs recorded? (see PRE-CHECK  )

HINT:

It is suspected that the DTCs were output due to poor connection of the connector terminal.

NO: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (SEE  PROBLEM SYMPTOMS TABLE   ) 

YES: REPLACE BRAKE ACTUATOR ASSY (SEE  REPLACEMENT  ) 

1. Disconnect the stop lamp switch assy connector S13.
   Fig 3: Disconnecting Stop Lamp Switch Assy

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2. Measure the resistance according to the value(s) in Fig 4 .

   Standard 

   Fig 4: Switch Pin Condition Chart

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NG: REPLACE STOP LAMP SWITCH ASSY 

OK: Go to next step. 

1. Disconnect the stop lamp switch connector S13 and skid control ECU connector S1.
   Fig 5: Disconnecting Stop Lamp Switch Connector & Skid Control ECU

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2. Measure the resistance according to the value(s) in Fig 6 .

   Standard 

   Fig 6: Measuring Resistance Between STP Specifications Chart

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE BRAKE ACTUATOR ASSY (SEE  REPLACEMENT  )