Inspection Procedure

Input Signal Check
1. See step ) INPUT SIGNAL CHECK.
2. Check the indicator light operation when each of the SET/COAST, RESUME/ACCEL and CANCEL switches is turned on.
  OK:
  1. SET/COAST, RESUME/ACCEL switch
    1. The signals shown in Fig 1 should be output when each switch is ON. The signal should disappear when the switch is turned OFF .
    Fig 1: Identifying Indicator Light Blinking Pattern Based On Input Signal
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. CANCEL switch
    1. The indicator light goes off when the cancel switch is turned ON .
      1. OK: Wait and see.
      2. NG: Go to next step.
Check voltage between terminals CCS of cruise control ECU connector and body ground .
1. Remove the ECU with the connector being.
2. Turn the ignition switch ON.
  
  Fig 2: Checking Voltage At CCS Terminal
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Measure the voltage between terminals 18 of the ECU connector and body ground when each of the SET/COAST, RESUME/ACCEL and CANCEL is turned ON.
  
  Fig 3: Identifying Resistance Based On Switch Position
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. OK: Go to next step.
  2. NG: Proceed to next circuit inspection shown in problem symptoms table. See PROBLEM SYMPTOMS .
Check control switch .
1. Remove the steering wheel center pad.
2. Disconnect the control switch connector.
  Measure the resistance between terminals 3 and 4 of the control switch connector when the control switch is operated.
  
  Fig 4: Measuring Control Switch Resistance
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 5: Identifying Resistance Based On Switch Position
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. OK: Go to next step.
  2. NG: Replace control switch.
Check harness and connector between cruise control ECU and cruise control switch, and cruise control switch and body ground. See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE .
1. OK: Go to next step.
2. NG: Repair or replace harness or connector.
Input Signal Check. See step INPUT SIGNAL CHECK .
1. OK: Wait and see.
2. NG: Check and replace cruise control ECU. See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE .