INSPECTION PROCEDURE O-8: The driver's or passenger's door switches signal is not sent to the ETACS-ECU.: Diagnosis

Required Special Tools: 

• MB991223: Test Harness Set
• MB991502: Scan Tool (MUT-II)
• MB991529: Diagnostic Trouble Code Check Harness

1. STEP 1. Check the door switch. 
   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   SWITCH POSITION	TESTER CONNECTION	SPECIFIED CONDITION
   Released	1 - 2	Less than 2 ohms
   Pressed	1 - 2 - 3	Open circuit

   Q: Is the door switch in good condition? 

   YES  : Go to Step 2.

   NO:  Replace door switch. The driver's and passenger's door switches input signal should be able to be checked and the functions, which are described in the "TECHNICAL DESCRIPTION (COMMENT) ," should work normally.

   Fig 1: Checking Door Switch

   Courtesy of DAIMLERCHRYSLER CORPORATION
2. STEP 2. Check the door switch installation state. 
   NOTE: The door switch is grounded to the body through the mounting screws.

   Remove the cap and measure the resistance between the lower metal part and the ground.

   • The resistance should equal 2 ohms or less.

   Q: Is the measured resistance 2 ohms or less? 

   YES  : Go to Step 3.

   NO:  Check the installation state and repair. The driver's and passenger's door switches input signal should be able to be checked and the functions, which are described in the "TECHNICAL DESCRIPTION (COMMENT) ," should work normally.

   Fig 2: Measuring Resistance Between Lower Metal Part And Ground

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3. STEP 3. Verify the location of malfunction. 

   Q: Which door switch signal is not input? 

   Driver's door  : Go to Step 4.

   Passenger's door  : Go to  Step 6.

4. STEP 4. Check the driver's door switch connector D-13 and ETACS-ECU connector C-319 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Are driver's door switch connector D-13 and ETACS-ECU connector C-319 in good condition? 

   YES  : Go to Step 5.

   NO:  Repair or replace the damaged component(s). Refer to , HARNESS CONNECTOR INSPECTION . The driver's door switch input signal should be able to be checked and the functions, which are described in the "TECHNICAL DESCRIPTION (COMMENT) ," should work normally.

   Fig 3: Identifying Connector D-13 - Harness Side

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   Fig 4: Identifying Connector C-319 - Junction Block Side

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5. STEP 5. Check the wiring harness between driver's door switch connector D-13 (terminal 2) and ETACS-ECU connector C-319 (terminal 10). 
   Fig 5: Identifying Connector D-13 - Harness Side

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   Fig 6: Identifying Connector C-319 - Junction Block Side

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   NOTE: Also check junction block connector C-301 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If junction block connector C-301 are damaged, repair or replace the damaged component(s) as described in , HARNESS CONNECTOR INSPECTION .

   Q: Is the wiring harness between the driver's door switch connector D-13 (terminal 2) and ETACS-ECU connector C-319 (terminal 10) in good condition? 

   YES  : Replace the ETACS-ECU. The driver's door switch input signal should be able to be checked and the functions, which are described in the "TECHNICAL DESCRIPTION (COMMENT) ," should work normally.

   NO:  The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. The driver's door switch input signal should be able to be checked and the functions, which are described in the "TECHNICAL DESCRIPTION (COMMENT) ," should work normally.

   Fig 7: Identifying Connector C-301 - Harness Side

   Courtesy of DAIMLERCHRYSLER CORPORATION
6. STEP 6. Check the passenger's door switch connector D-21 and ETACS-ECU connectors C-318 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

   Q: Are passenger's door switch connector D-21 and ETACS-ECU connectors C-318 in good condition? 

   YES  : Go to Step 7.

   NO:  Repair or replace the damaged component(s). Refer to , HARNESS CONNECTOR INSPECTION . The passenger's door switch input signal should be able to be checked and the functions, which are described in the "TECHNICAL DESCRIPTION (COMMENT) ," should work normally.

   Fig 8: Identifying Connector D-21 - Harness Side

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   Fig 9: Identifying Connector C-318 - Harness Side

   Courtesy of DAIMLERCHRYSLER CORPORATION
7. STEP 7. Check the wiring harness between passenger's door switch connector D-21 (terminal 2) and ETACS-ECU connectors C-318 (terminal 65). 
   Fig 10: Identifying Connector D-21 - Harness Side

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   Fig 11: Identifying Connector C-318 - Harness Side

   Courtesy of DAIMLERCHRYSLER CORPORATION
   NOTE: Also check intermediate connector C-210 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-210 are damaged, repair or replace the damaged component(s) as described in , HARNESS CONNECTOR INSPECTION .

   Q: Are the wiring harness between passenger's door switch connector D-21 (terminal 2) and ETACS-ECU connector C-318 (terminal 65) in good condition? 

   YES  : Replace the ETACS-ECU. The passenger's door switch input signal should be able to be checked and the functions, which are described in the "TECHNICAL DESCRIPTION (COMMENT) ," should work normally.

   NO:  The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. The passenger's door switch input signal should be able to be checked and the functions, which are described in the "TECHNICAL DESCRIPTION (COMMENT) ," should work normally.

   Fig 12: Identifying Connector C-210

   Courtesy of DAIMLERCHRYSLER CORPORATION