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Inspection Procedure O-8


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






CIRCUIT OPERATION
The ETACS-ECU operates various functions according to the input signal from the driver's or passenger's door switch.

TECHNICAL DESCRIPTION (COMMENT)
The driver's and passenger's door switches are used to operate the following devices or systems:
- Ignition key reminder tone alarm function (driver's door switch only)
- Light reminder tone alarm function (driver's door switch only)
- Door ajar tone alarm function
- Forgotten key prevention function
- Power window timer function
- Keyless entry system
- Sunroof timer function
- Door ajar warning light
- Interior light
- Theft-alarm system
If the signal fails, these devices will not work normally.

TROUBLESHOOTING HINTS
- The driver's or passenger's door switch may be defective
- The ETACS-ECU may be defective
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector

DIAGNOSIS
Required Special Tools:
- MB991223: Test Harness Set
- MB991502: Scan Tool (MUT-II)
- MB991529: Diagnostic Trouble Code Check Harness




STEP 1. Check the door switch.

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.




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.

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.







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-13and ETACS-ECU connector C-319 in good condition?

YES : Go to Step 5.

NO : Repair or replace the damaged components). 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.










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

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 components) 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.







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 components). 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.










STEP 7. Check the wiring harness between passenger's door switch connector D-21 (terminal 2) and ETACS-ECU connectors C-318 (terminal
65).

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 components) 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.




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