INSPECTION PROCEDURE 5: When The TCL Switch Is Push On, TCL Does Not Cancelled.: 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. 
   1. Disconnect the ABS/TCL-ECU connector A-02.
      Fig 1: Identifying ABS/TCL-ECU Connector A-02

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   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.
        Fig 2: Connecting Special Tool MB991970 Between ABS/TCL-EUC And Body-Side Harness Connector

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   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? 

   1. YES :  Go to  Step 6.
   2. NO :  Go to Step 2.
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? 

   1. YES :  Install the TCL switch. (Refer to TCL SWITCH ). Then go to  Step 6.
   2. NO :  Replace the TCL switch. (Refer to TCL SWITCH ). Then go to  Step 7.
      Fig 3: Checking Continuity Between Terminals 1 And 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? 

   1. YES :  Go to Step 4.
   2. 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

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

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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? 

   1. YES :  Go to Step 5.
   2. NO :  Repair the damaged harness wire. Then go to  Step 7.
      Fig 6: Identifying Intermediate Connector A-02

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      Fig 7: Identifying Intermediate Connector C-131

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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? 

   1. YES :  Go to Step 6.
   2. NO :  Repair the damaged harness wire. Then go to  Step 7.
      Fig 8: Identifying Intermediate Connector C-131

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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? 

   1. YES :  It can be assumed that this malfunction is intermittent. (Refer to How to Use Troubleshooting/Inspection Service Points - HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
   2. 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 cancelled, when the TCL switch is push on? 

   1. YES :  The procedure is complete.
   2. NO :  Return to  Step 1.