Inspection Procedure

1. Check that the stop light comes on when the brake pedal is depressed, and turns off when the brake pedal is released.
   1. NO: INSPECT STOP LAMP CIRCUIT 

YES: Go to next step 

Fig 1: Input Signal And Indicator Light Blinking Pattern Chart

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1. See input signal check on PRE-CHECK .
2. Check the indicator light when the brake pedal is depressed.

   OK: Go To Next Step 

   The indicator light goes off when the brake pedal is depressed. 

   1. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN (  PROBLEM SYMPTOMS TABLE  ) 

NG: Go to next step 

Fig 2: Identifying Terminal 3 (STP -) Of Cruise Control ECU Assy Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Remove the cruise control ECU assy with connectors still connected.
2. Turn the ignition switch to ON.
3. Measure voltage between terminal 3 (STP-) of cruise control ECU assy connector and body ground, when the brake pedal is depressed and released.

   OK: Go To Next Step 

   CRUISE CONTROL ECU ASSY CONNECTOR TERMINAL (STP -) VOLTAGE SPECIFICATIONS
   
   

   Brake Pedal	Voltage
   Depressed	10-16V
   Released	Below 1 V

   1. NG: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN (  PROBLEM SYMPTOMS TABLE  ) 

OK: Go to next step 

1. Check for open and short circuit in harness and connector between cruise control ECU assy and stop lamp switch assy (See ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).
   1. NG: REPAIR OR REPLACE HARNESS OR" CONNECTOR 

OK: Go to next step 

CHECK AND REPLACE CRUISE CONTROL ECU ASSY (See  ELECTRONIC CIRCUIT INSPECTION PROCEDURE  )