Inspection Procedure

1. Check that the stop light lights up when brake pedal is depressed and turns OFF when the brake pedal is released.

NG : Go to step   4 

OK : GO TO NEXT STEP 

1. Remove the skid control ECU with connectors still connected.
2. Measure voltage between terminal STP of skid control ECU and body ground when brake pedal is depressed.

   OK: 

   Voltage: 8 - 14 V 

   Fig 1: Inspecting Skid Control ECU Terminal Voltage (STP Terminal)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK : CHECK AND REPLACE SKID CONTROL ECU ASSY 

NG : Go to next step 

1. Check for open and short circuit in harness and connector between stop light switch and skid control ECU (See ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK : PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON  PROBLEM SYMPTOMS TABLE   ) 

1. Check for open and short circuit in harness and connector of the stop light circuit (See ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).

OK : REPLACE STOP LAMP SWITCH ASSY 

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR