Inspection Procedure M-7

The ETACS-ECU does not Receive Any Signal from the Door Lock Switch (Incorporated in Power Window Main Switch and Power Window Sub Switch)

Door Lock Switch Input Circuit:

Connectors:

CIRCUIT OPERATION
The ETACS-ECU operates the central door locking system according to signal from the door lock switch.

TECHNICAL DESCRIPTION (COMMENT)
If the signal is not normal, the doors is not locked or unlocked. If the signal is not normal, the power window main switch, power window sub switch or the ETACS-ECU may be defective.

TROUBLESHOOTING HINTS
- Malfunction of the power window main switch or power window sub switch (door lock switch)
- 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 switch is defective.

Q: Which door switch signal is not entered?
Power window main switch (Driver's door): Go to Step 2.
Power window sub switch (Front passenger's door): Go to Step 8.







STEP 2. Check the door lock switch (power window main switch).
Remove the power window main switch. Then check continuity between the switch terminals.

Q: Is the door lock switch (power window main switch) in good condition?

YES: Go to Step 3.

NO: Replace the power window main switch. If the central door locking system works normally, input signal from the door lock switch should be normal.




STEP 3. Check at power window main switch connector E-05 in order to check the power window main switch ground circuit.

1. Disconnect power window main switch connector E-05, and measure at the harness side.
2. Measure the resistance value between terminal 12 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 power window main switch connector E-05 for damage.

Q: Is power window main switch connector E-05 in good condition?

YES: Go to Step 5.

NO: Repair or replace the connector. Refer to Harness Connector Inspection. If the central door locking system works normally, input signal from the door lock switch should be normal.







STEP 5. Check the wiring harness between power window main switch E-05 and ground.

NOTE: Also check intermediate connector C-17. If intermediate connectors C-17 is damaged, repair or replace the connector as described in Harness Connector Inspection.

Q: Is the wiring harness between power window main switch connector E-05 and ground in good condition?

YES: No action to be taken.

NO: Repair the wiring harness. If the central door locking system works normally, input signal from the door lock switch should be normal.







STEP 6. Check power window main switch connector E-05 and ETACS-ECU connector C-227 for damage.

Q: Are power window main switch connector E-05 and ETACS-ECU connector C-227 in good condition?

YES: Go to Step 7.

NO: Repair or replace the connector. Refer to Harness Connector Inspection. If the central door locking system works normally, input signal from the door lock switch should be normal.










STEP 7. Check the wiring harness between power window main switch connector E-05 and ETACS-ECU connector C-227.

NOTE: Also check intermediate connector C-17. If intermediate connectors C-17 is damaged, repair or replace the connector as described in Harness Connector Inspection.

Q: Is the wiring harness between power window main switch connector E-05 and ETACS-ECU connector C-227 in good condition?

YES: Replace the ETACS-ECU. If the central door locking system works normally, input signal from the door lock switch should be normal.

NO: Repair the wiring harness. If the central door locking system works normally, input signal from the door lock switch should be normal.







STEP 8. Check the door lock switch (power window sub switch).
Remove the power window sub switch. Then check continuity between the switch terminals.

Q: Is the door lock switch (power window sub switch) in good condition?

YES: Go to Step 9.

NO: Replace the power window sub switch. If the central door locking system works normally, input signal from the door lock switch should be normal.




STEP 9. Measure at power window sub switch connector E-14 in order to check the ground circuit to the power window sub switch.
1. Disconnect power window sub switch connector E-14, and measure at the harness side.
2. Measure the resistance value between terminal 2 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 power window sub switch connector E-14 for damage.

Q: Is power window sub switch connector E-14 in good condition?

YES: Go to Step 11.

NO: Repair or replace the connector. Refer to Harness Connector Inspection. If the central door locking system works normally, input signal from the door lock switch should be normal.







STEP 11. Check the wiring harness between power window sub switch E-14 and ground.

NOTE: Also check intermediate connector C-110. If intermediate connectors C-110 is damaged, repair or replace the connector as described in Harness Connector Inspection.

Q: Is the wiring harness between power window sub switch connector E-14 and ground in good condition?

YES: No action to be taken.

NO: Repair the wiring harness. If the central door locking system works normally, input signal from the door lock switch should be normal.







STEP 12. Check power window sub switch connector E-14 and ETACS-ECU connector C-227 for damage.

Q: Are power window sub switch connector E-14 and ETACS-ECU connector C-227 in good condition?

YES: Go to Step 13.

NO: Repair or replace the connector. Refer to Harness Connector Inspection. If the central door locking system works normally, input signal from the door lock switch should be normal.










STEP 13. Check the wiring harness between power window sub switch connector E-14 and ETACS-ECU connector C-227.

NOTE: Also check intermediate connector C-110. If intermediate connectors C-110 is damaged, repair or replace the connector as described in Harness Connector Inspection.

Q: Is the wiring harness between power window sub switch connector E-14 and ETACS-ECU connector C-227 in good condition?

YES: Replace the ETACS-ECU. If the central door locking system works normally, input signal from the door lock switch should be normal.

NO: Repair the wiring harness. If the central door locking system works normally, input signal from the door lock switch should be normal.