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Inspection Procedure O-6



The ETACS-ECU does not Receive Any Signal from the Driver's, Front Passenger's or Rear Door Lock Actuator Switch.

Door Lock Actuator Input Circuit:




Connector:






CIRCUIT OPERATION
The ETACS-ECU operates the following functions or systems according to signal from the driver's or front passenger's or rear door lock actuator switch:
- Central door locking system
- Keyless entry system
- Dome light dimming function

TECHNICAL DESCRIPTION (COMMENT)
If the signal is not normal, the functions or systems, which are described in "CIRCUIT OPERATION", do not work normally.

TROUBLESHOOTING HINTS
- Malfunction of the driver's, front passenger's or rear door latch assembly
- Malfunction of the ETACS-ECU
- Damaged harness wires or connectors

DIAGNOSIS

Required Special Tools:
- MB991223: Test Harness Set
- MB991502: Scan Tool (MUT-II)

STEP 1. Check which door lock actuator switch is defective.

Q: Which door lock actuator switch signal is not entered?
Driver's door : Go to Step 2.
Front passenger's door : Go to Step 8.
Rear door (LH): Go to Step 14.
Rear door (RH): Go to Step 20.







STEP 2. Check the driver's door lock actuator switch.
Disconnect driver's door lock actuator switch connector E-15. Then check continuity between the switch terminals.

Q: Is the driver's door lock actuator switch in good condition?

YES: Go to Step 3.

NO: Replace the driver's door lock actuator switch. If the functions, which are described in "CIRCUIT OPERATION", work normally, the input signal from the driver's door lock actuator switch should be normal.




STEP 3. Measure at driver's door lock actuator switch connector E-15 in order to check the ground circuit to the driver's door lock actuator switch.
1. Disconnect driver's door lock actuator switch connector E-15, and measure at the harness side.
2. Measure the resistance value between terminal 1 and ground.
- The measured value should be 2 ohm or less.

Q: Does the measured resistance value correspond with this range?

YES: Go to Step 6.

NO: Go to Step 4.




STEP 4. Check driver's door lock actuator switch connector E-15 for damage.

Q: Is driver's door lock actuator switch connector E-15 in good condition?

YES: Go to Step 5.

NO: Repair or replace the connector. Refer to Harness Connector Inspection. If the functions, which are described in "CIRCUIT OPERATION", work normally, the input signal from the driver's door lock actuator switch should be normal.







STEP 5. Check the wiring harness between driver's door lock actuator switch connector E-15 and ground.

NOTE: Also check intermediate connector C-68. If intermediate connectors C-68 is damaged, repair or replace the connector as described in Harness Connector Inspection.

Q: Is the wiring harness between driver's door lock actuator switch connector E-15 and ground in good condition?

YES: No action to be taken.

NO: Repair the wiring harness. If the functions, which are described in "CIRCUIT OPERATION", work normally, the input signal from the driver's door lock actuator switch should be normal.







STEP 6. Check driver's door lock actuator switch connector E-15 and ETACS-ECU connector C-93 for damage.

Q: Are driver's door lock actuator switch connector E-15 and ETACS-ECU connector C-93 in good condition?

YES: Go to Step 7.

NO: Repair or replace the connector. Refer to Harness Connector Inspection. If the functions, which are described in "CIRCUIT OPERATION", work normally, the input signal from the driver's door lock actuator switch should be normal.










STEP 7. Check the wiring harness between driver's door lock actuator switch connector E-15 and ETACS-ECU connector C-93.

NOTE: Also check intermediate connector C-68. If intermediate connectors C-68 is damaged, repair or replace the connector as described in Harness Connector Inspection.

Q: Is the wiring harness between driver's door lock actuator switch connector E-15 and ETACS-ECU connector C-93 in good condition?

YES: Replace the ETACS-ECU. If the functions, which are described in "CIRCUIT OPERATION", work normally, the input signal from the driver's door lock actuator switch should be normal.

NO: Repair the wiring harness. If the functions, which are described in "CIRCUIT OPERATION", work normally, the input signal from the driver's door lock actuator switch should be normal.







STEP 8. Check the front passenger's door lock actuator switch.
Disconnect front passenger's door lock actuator switch connector E-07. Then check continuity between the switch terminals.

Q: Is the front passenger's door lock actuator switch in good condition?

YES: Go to Step 9.

NO: Replace the front passenger's seat door lock actuator switch. If the functions, which are described in "CIRCUIT OPERATION", work normally, the input signal from the front passenger's door lock actuator switch should be normal.




STEP 9. Measure at front passenger's door lock actuator switch connector E-07 in order to check the ground circuit to the front passenger's door lock actuator switch.
1. Disconnect front passenger's door lock actuator switch connector E-07, and measure at the harness side.
2. Measure the resistance value between terminal 3 and ground.
- The measured value should be 2 ohm or less.

Q: Does the measured resistance value correspond with this range?

YES: Go to Step 12.

NO: Go to Step 10.




STEP 10. Check front passenger's door lock actuator switch connector E-07 for damage.

Q: Is front passenger's door lock actuator switch connector E-07 in good condition?

YES: Go to Step 11.

NO: Repair or replace the connector. Refer to Harness Connector Inspection. If the functions, which are described in "CIRCUIT OPERATION", work normally, the input signal from the front passenger's door lock actuator switch should be normal.







STEP 11. Check the wiring harness between front passenger's door lock actuator switch connector E-07 and ground.

NOTE: Also check intermediate connector C-72. If intermediate connectors C-72 is damaged, repair or replace the connector as described in Harness Connector Inspection.

Q: Is the wiring harness between front passenger's door lock actuator switch connector E-07 and ground in good condition?

YES: No action to be taken.

NO: Repair the wiring harness. If the functions, which are described in "CIRCUIT OPERATION", work normally, the input signal from the front passenger's door lock actuator switch should be normal.







STEP 12. Check front passenger's door lock actuator switch connector E-07 and ETACS-ECU connector C-93 for damage.

Q: Are front passenger's door lock actuator switch connector E-07 and ETACS-ECU connector C-93 in good condition?

YES: Go to Step 13.

NO: Repair or replace the connector. Refer to Harness Connector Inspection. If the functions, which are described in "CIRCUIT OPERATION", work normally, the input signal from the front passenger's door lock actuator switch should be normal.










STEP 13. Check the wiring harness between front passenger's door lock actuator switch connector E-07 and ETACS-ECU connector C-93.

NOTE: Also check intermediate connector C-72. If intermediate connectors C-72 is damaged, repair or replace the connector as described in Harness Connector Inspection.

Q: Is the wiring harness between front passenger's door lock actuator switch connector E-07 and ETACS-ECU connector C-93 in good condition?

YES: Replace the ETACS-ECU. If the functions, which are described in "CIRCUIT OPERATION", work normally, the input signal from the front passenger's door lock actuator switch should be normal.

NO: Repair the wiring harness. If the functions, which are described in "CIRCUIT OPERATION", work normally, the input signal from the front passenger's door lock actuator switch should be normal.







STEP 14. Check the rear door lock actuator switch (LH).
Disconnect rear door lock actuator switch (LH) connector E-11. Then check continuity between the switch terminals.

Q: Is the rear door lock actuator switch (LH) in good condition?

YES: Go to Step 15.

NO: Replace the rear door lock actuator switch (LH). If the functions, which are described in "CIRCUIT OPERATION", work normally, the input signal from the rear door lock actuator switch (LH) should be normal.




STEP 15. Check at rear door lock actuator switch (LH) connector E-11 in order to check the ground circuit to the rear door lock actuator switch (LH).
1. Disconnect driver's door lock actuator switch connector E-11, and measure at the harness side.
2. Measure the resistance value between terminal 1 and ground.
- The measured value should be 2 ohm or less.

Q: Does the measured resistance value correspond with this range?

YES: Go to Step 18.

NO: Go to Step 16.




STEP 16. Check rear door lock actuator switch (LH) connector E-11 for damage.

Q: Is rear door lock actuator switch (LH) connector E-11 in good condition?

YES: Go to Step 17.

NO: Repair or replace the connector. Refer to Harness Connector Inspection. If the functions, which are described in "CIRCUIT OPERATION", work normally, the input signal from the rear door lock actuator switch (LH) should be normal.







STEP 17. Check the wiring harness between rear door lock actuator switch (LH) connector E-11 and ground.

NOTE: Also check intermediate connector D-19. If intermediate connectors D-19 is damaged, repair or replace the connector as described in Harness Connector Inspection.

Q: Is the wiring harness between rear door lock actuator switch (LH) connector E-11 and ground in good condition?

YES: No action to be taken.

NO: Repair the wiring harness. If the functions, which are described in "CIRCUIT OPERATION", work normally, the input signal from the rear door lock actuator switch (LH) should be normal.







STEP 18. Check rear door lock actuator switch (LH) connector E-11 and ETACS-ECU connector C-95 for damage.

Q: Are rear door lock actuator switch (LH) connector E-11 and ETACS-ECU connector C-95 in good condition?

YES: Go to Step 19.

NO: Repair or replace the connector. Refer to Harness Connector Inspection. If the functions, which are described in "CIRCUIT OPERATION", work normally, the input signal from the rear door lock actuator switch (LH) should be normal.













STEP 19. Check the wiring harness between rear door lock actuator switch (LH) connector E-11 and ETACS-ECU connector C-95.

NOTE: Also check intermediate connectors C-67 and D-19. If intermediate connector C-67 or D-19 is damaged, repair or replace the connector as described in Harness Connector Inspection.

Q: Is the wiring harness between rear door lock actuator switch (LH) connector E-11 and ETACS-ECU connector C-95 in good condition?

YES: Replace the ETACS-ECU. If the functions, which are described in "CIRCUIT OPERATION", work normally, the input signal from the rear door lock actuator switch (LH) should be normal.

NO: Repair the wiring harness. If the functions, which are described in "CIRCUIT OPERATION", work normally, the input signal from the rear door lock actuator switch (LH) should be normal.







STEP 20. Check the rear door lock actuator switch (RH).
Disconnect rear door lock actuator switch (RH) connector E-10. Then check continuity between the switch terminals.

Q: Is the rear door lock actuator switch (RH) in good condition?

YES: Go to Step 21.

NO: Replace the rear door lock actuator switch (RH). If the functions, which are described in "CIRCUIT OPERATION", work normally, the input signal from the rear door lock actuator switch (RH) should be normal.




STEP 21. Check at rear door lock actuator switch (RH) connector E-10 in order to check the ground circuit to the rear door lock actuator switch (RH).
1. Disconnect rear door lock actuator switch (RH) connector E-10, and measure at the harness side.
2. Measure the resistance value between terminal 1 and ground.
- The measured value should be 2 ohm or less.

Q: Does the measured resistance value correspond with this range?

YES: Go to Step 24.

NO: Go to Step 22.




STEP 22. Check rear door lock actuator switch (RH) connector E-10 for damage.

Q: Is rear door lock actuator switch (RH) connector E-10 in good condition?

YES: Go to Step 23.

NO: Repair or replace the connector. Refer to Harness Connector Inspection. If the functions, which are described in "CIRCUIT OPERATION", work normally, the input signal from the rear door lock actuator switch (RH) should be normal.







STEP 23. Check the wiring harness between rear door lock actuator switch (RH) connector E-10 and ground.

NOTE: Also check intermediate connector D-07. If intermediate connectors D-07 is damaged, repair or replace the connector as described in Harness Connector Inspection.

Q: Is the wiring harness between rear door lock actuator switch (RH) connector E-10 and ground in good condition?

YES: No action to be taken.

NO: Repair the wiring harness. If the functions, which are described in "CIRCUIT OPERATION", work normally, the input signal from the rear door lock actuator switch (RH) should be normal.







STEP 24. Check rear door lock actuator switch (RH) connector E-10 and ETACS-ECU connector C-95 for damage.

Q: Are rear door lock actuator switch (RH) connector E-10 and ETACS-ECU connector C-95 in good condition?

YES: Go to Step 25.

NO: Repair or replace the connector. Refer to Harness Connector Inspection. If the functions, which are described in "CIRCUIT OPERATION", work normally, the input signal from the rear door lock actuator switch (RH) should be normal.













STEP 25. Check the wiring harness between rear door lock actuator switch (RH) connector E-10 and ETACS-ECU connector C-95.

NOTE: Also check intermediate connectors C-71 and D-07. If intermediate connector C-71 or D-07 is damaged, repair or replace the connector as described in Harness Connector Inspection.

Q: Is the wiring harness between rear door lock actuator switch (RH) connector E-10 and ETACS-ECU connector C-95 in good condition?

YES: Replace the ETACS-ECU. If the functions, which are described in "CIRCUIT OPERATION", work normally, the input signal from the rear door lock actuator switch (RH) should be normal.

NO: Repair the wiring harness. If the functions, which are described in "CIRCUIT OPERATION", work normally, the input signal from the rear door lock actuator switch (RH) should be normal.
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