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Circuit Description: Wiring Diagram

WARNING: This page is about a different car, the 2004 Toyota Corolla and 2003 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Clutch Switch Circuit Wiring Diagram
G02861226Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. INPUT SIGNAL CHECK 
    1. See the input signal check on page 05-745.
    2. Check the indicator light when the clutch pedal is depressed.

      OK: 

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

      Fig 2: Checking Input Signal
      G02861227Courtesy 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. 
  2. INSPECT TERMINAL VOLTAGE (D) 
    1. Turn the ignition switch to ON.
    2. Measure the voltage between terminal 4 (D) of the cruise control ECU assy connector and the body ground when the clutch pedal is depressed and released.

      OK: 

      VOLTAGE RESISTANCE SPECIFICATION

      Clutch Pedal Voltage
      Clutch pedal depressed Below 1 V
      Clutch pedal released 10 - 16 V
      Fig 3: Identifying Terminal Voltage (D)
      G02861228Courtesy 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 CLUTCH SWITCH ASSY 
    1. Disconnect the clutch switch assy connector.
    2. Check continuity between terminal 1 and 2 of clutch switch assy.

      OK: 

      CONTINUITY SPECIFICATION

      Clutch Switch Assy Position Specification
      Switch pin free No continuity
      Switch pin pushed in Continuity
      Fig 4: Checking Continuity Between Terminal 1 And 2 Of Clutch Switch Assy
      G02861229Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPLACE CLUTCH SWITCH ASSY 
    2. OK: GO TO NEXT STEP. 
  4. CHECK HARNESS AND CONNECTOR (BETWEEN CRUISE CONTROL ECU ASSY AND GAUGE FUSE) 
    1. Check for open and short circuit in harness and connector between cruise control ECU assy and gauge fuse (See ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK: CHECK AND REPLACE CRUISE CONTROL ECU ASSY (See  ELECTRONIC CIRCUIT INSPECTION PROCEDURE  ) 
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