Inspection Procedure 5: When The TCL Switch Is Pushed On, TCL Does Not Cancel: Diagnosis

Required Special Tools: 

• MB991223: Harness Set
• MB991970: ABS Check Harness

1. STEP 1. Measure the terminal voltage at ABS/TCL-ECU connector A-02. 
   Fig 1: Identifying ABS/TCL-ECU Connector A-02 Terminals

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   1. Disconnect the ABS/TCL-ECU connector A-02.
   2. Connect special tool MB991970 between the ABS/TCL-EUC and the body-side harness connector.
   3. Turn the ignition switch to the "ON" position.
   4. Measure the terminal voltage between special tool MB991970 connector terminal 6 (ABS/TCL-ECU connector A-02 terminal 6) and ground.
      • When the TCL switch is not pressed, the voltage should measure battery positive voltage (approximately 12 volts).
      • When the TCL switch is pressed, the voltage should measure 1 volt or less.
   5. Turn the ignition switch to the "LOCK" (OFF) position.
   6. Disconnect special tool MB991970 between the ABS/TCL-ECU and the body-side harness connector.
   7. Connect the ABS/TCL-ECU connector A-02.

   Q: Is the terminal voltage battery terminal voltage when the TCL switch is not pressed, and is the terminal voltage 1 volt or less when the TCL switch is pressed? 

   YES:  Go to  Step 6.

   NO:  Go to Step 2.

   Fig 2: Measuring Voltage Between Special Tool Connector Terminal No. 6 & Ground

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2. STEP 2. Check the TCL switch. 
   1. Remove the TCL switch. Refer to TCL SWITCH  .
   2. Connect an ohmmeter to the TCL switch between terminals 1 and 2.
   3. Check for continuity between terminals 1 and 2 when the TCL switch is operated.
      • There is no continuity between terminals 1 and 2 when the TCL switch is not pressed.
      • There is continuity between terminals 1 and 2 when the TCL switch is pressed.

   Q: Is there no continuity between terminals 1 and 2 when the TCL switch is not pressed, and is there continuity when the TCL switch is pressed? 

   YES:  Install the TCL switch. Refer to TCL SWITCH  , then go to  Step 6.

   NO:  Replace the TCL switch. Refer to TCL SWITCH  , then go to  Step 7.

   Fig 3: Checking Continuity Between Terminals No. 1 & 2

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3. STEP 3. Check ABS/TCL-ECU connector A-02, intermediate connector C-29 and TCL switch connectors C-131 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Are there connectors and terminals in good condition? 

   YES:  Go to Step 4.

   NO:  Repair or replace the faulty connector. Refer to HARNESS CONNECTOR INSPECTION , then go to  Step 7.

   Fig 4: Identifying ABS/TCL-ECU Connector A-02 Terminals

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   Fig 5: Identifying Connector C-29 & C-131 Terminals

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4. STEP 4. Check the harness wire between ABS/TCL-ECU connector A-02 terminal 6 and TCL switch connector C-131 terminal 1 for damage. 

   Q: Are there harness wires in good condition? 

   YES:  Go to Step 5.

   NO:  Repair the damaged harness wire. Then go to  Step 7.

   Fig 6: Identifying Connector A-02 Terminals

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   Fig 7: Identifying Connector C-131 Terminals

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5. STEP 5. Check the harness wire between TCL switch connector C-131 terminal 2 and ground for damage. 

   Q: Is the harness wire in good condition? 

   YES:  Go to Step 6.

   NO:  Repair the damaged harness wire. Then go to  Step 7.

   Fig 8: Identifying Connector C-131 Terminals

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   Fig 9: Identifying Combination Meter Connector

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6. STEP 6. Retest the system 

   Q: Does TCL system cancelled, when the TCL switch is push on? 

   YES:  It can be assumed that this malfunction is intermittent. Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .

   NO:  Replace the hydraulic unit (integrated with ABS/TCL-ECU). Refer to HYDRAULIC UNIT , then go to Step 7.

7. STEP 7. Retest the system 

   Q: Does TCL system cancel, when the TCL switch is pushed on? 

   YES:  The procedure is complete.

   NO:  Return to  Step 1.