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Inspection Procedure

WARNING: This page is about a different car, the 2005 Toyota Sienna. However, it is still accessible from the selected car via links, so may be relevant.
  1. INSPECT CRUISE CONTROL MAIN SWITCH 
    1. Disconnect the cruise control main switch connector.
    2. Measure the resistance between terminal 1 and 3 of the cruise control main switch connector when the cruise control main switch is operated.

      Standard: 

      TERMINAL 1 AND 3 OF CRUISE CONTROL MAIN SWITCH CONNECTOR

      Switch condition Resistance (Ω)
      Neutral 10 kΩ or higher
      +/RES 210 to 270
      -/SET 560 to 700
      CANCEL 1,380 to 1,700
    3. Check continuity between terminals 1 and 3 of cruise control main switch connector when main switch button is held on and off.
      TERMINALS 1 AND 3 OF CRUISE CONTROL MAIN SWITCH CONNECTOR

      Switch position Tester connection Specification
      OFF 1 - 3 10 kΩ or higher
      ON 1 - 3 Below 1 Ω
    4. Check continuity between terminals 1 and 2 of cruise control main switch connector when the mode switch is operated.

      Standard: 

      TERMINALS 1 AND 2 OF CRUISE CONTROL MAIN SWITCH CONNECTOR

      Switch position Tester connection Specification
      MODE 1 - 2 Below 1 Ω
    Fig 1: Inspecting Cruise Control Main Switch
    G02608089Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPLACE CRUISE CONTROL MAIN SWITCH 
    2. OK: Go to next step 
  2. CHECK WIRE HARNESS AND CONNECTOR (CRUISE CONTROL MAIN SWITCH - ECM) 
    1. Check for an open or short circuit in harness and connector between cruise control main switch and ECM (See ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).
    1. NG: REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR 
    2. OK: Go to next step 
  3. CHECK WIRE HARNESS AND CONNECTOR (CRUISE CONTROL MAIN SWITCH - BODY GROUND) 
    1. Check for an open or short circuit in harness and connector between cruise control main switch and body ground (See ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).
    1. NG: REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR 
    2. OK: Go to next step 
  4. INSPECT ECM 
    1. Remove the ECM with connector.
    2. Turn the ignition switch ON.
    3. Measure the voltage between terminal CCS (E5-24) of ECM and body ground, when cruise main switch is operated.

      Standard: 

      Fig 2: Measuring Voltage Between Terminal CCS (E5-24) Of ECM & Body Ground
      G02608090Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TERMINAL CCS (E5-24) OF ECM AND BODY GROUND

      Switch position Voltage
      Neutral 10 to 14 V
      CANCEL 6.6 to 10.1 V
      -/SET 4.5 to 7.1 V
      +/RES 2.3 to 4 V
      Main switch ON Below 1 V
    4. Measure the voltage between terminal CCHG (E6-28) of ECM and body ground, when cruise control main switch is operated.
      Fig 3: Measuring Voltage Between Terminal CCHG (E6-28) Of ECM & Body Ground
      G02608091Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      TERMINAL CCHG (E6-28) OF ECM AND BODY GROUND

      Switch position Voltage
      MODE Below 1 V
      Neutral 10 to 14 V
    1. NG: REPLACE ECM (See  REPLACEMENT  ) 
    2. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (See  PROBLEM SYMPTOMS TABLE   ) 
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