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Home › Lexus › 2003 › ES 300 › Repair and Diagnosis › Accessories & Equipment › Cruise Control Systems › Cruise Control System - Diagnosis › Cruise Control Switch Circuit › Inspection Procedure

Inspection Procedure

  1. READ VALUE OF HAND-HELD TESTER 
    1. Connect the hand-held tester to the DLC3.
    2. Turn the ignition switch ON and push the hand-held tester main switch ON.
    3. Select the item "CANCEL SW, SET/COAST SW, RES/ACC SW, MAIN SW" in the DATA LIST and read its value displayed on the hand- held tester.

      OK: 

      HAND - HELD TESTER CHECK CONDITION

      Description Tester display Check condition
      Cruise control switch
      CANCEL switch ON      		 CANCEL SW ON - OFF
      Cruise control switch
      SET/COAST switch ON      		 SET/COAST SW ON - OFF
      Cruise control switch
      RES/ACC switch ON      		 RES/ACC SW ON - OFF
      Cruise main switch (Sub CPU) MAIN SW (SUB) ON - OFF
      Cruise main switch (Main CPU) MAIN SW (MAIN) ON - OFF
    1. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE (See  PROBLEM SYMPTOMS TABLE   ) 
    2. NG: Go to next step. 
  2. INSPECT ECM(CCS) 
    1. Remove ECM with the connector.
    2. Turn the ignition switch to ON.
    3. Measure the voltage between terminals CCS of ECM connector and body ground when each of the SET/ COAST, RESUME/ACCEL and CANCEL is turned ON.

      OK: 

      SWITCH POSITION VOLTAGE

      Switch position Voltage (V)
      Neutral 10 - 16
      RES/ACC 2.3 - 4.5
      SET/COAST 4.5 - 8.1
      CANCEL 6.6 - 11.4
      Fig 1: Identifying ECM Terminals CCS
      G03373006Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE (See  PROBLEM SYMPTOMS TABLE   ) 
    2. NG: Go to next step. 
  3. INSPECT CRUISE CONTROL MAIN SWITCH ASSY 
    1. Remove the steering wheel center pad.
    2. Disconnect the control switch connector.
    3. Measure the resistance between terminal CCS and ECC of the control switch connector when the control switch is operated.
      SWITCH POSITION RESISTANCE

      Switch position Resistance (Ω)
      Neutral "INFINITY" (No continuity)
      CRUISE 0 (Continuity)
      RES/ACC 220 - 260
      SET/COAST 600 - 660
      CANCEL 1,500 - 1,600
      Fig 2: Identifying Control Switch Connector Terminal CCS And ECC
      G03373007Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPLACE CRUISE CONTROL MAIN SWITCH ASSY 
    2. OK: Go to next step. 
  4. CHECK HARNESS AND CONNECTOR (BETWEEN ECM AND CRUISE CONTROL MAIN SWITCH) 
    1. Check for open and short circuit in the harness and the connector between terminal CCS of ECM and terminal CCS of the cruise control switch (See ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).
    2. Check for open and short circuit in the harness and the connector between terminal ECC of the cruise control switch and body ground (See ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE (See  PROBLEM SYMPTOMS TABLE   1) 
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