9. No Windows Work After The Ign. Is Turned From On to Off
CIRCUIT OPERATION
When a front door LH/RH is closed and the ignition switch is turned from ON to OFF, a timer operation signal is sent from the ETACS-ECU to the FRONT-ECU and the power window relay is turned ON for 30 seconds so that the windows can be opened or closed by the power window (main or sub) switch. When the front doors (LH or RH) are opened while the timer is operating, the timer will be canceled.
TECHNICAL DESCRIPTION
The cause may be a malfunction of the power window timer circuit or ground circuit.
TROUBLESHOOTING HINTS
- Malfunction of the FRONT-ECU
- Malfunction of the ETACS-ECU
- Malfunction of the front door switch LH or RH
- Damaged harness wires or connectors
DIAGNOSIS
Required Special Tools:
MB991223: Harness Set
MB991502: Scan tool (MUT-II)
MB991529: Diagnostic Trouble Code Check Harness
CAUTION:" To prevent damage to the scan tool MB991502, make sure the ignition switch is "OFF" before connecting or disconnecting the scan tool MB991502.
STEP 1. Check the ETACS-ECU input signal. Using either the scan tool or a voltmeter
- Using the scan tool MB991502
1. Connect scan tool MB991502 to the data link connector.
2. If the tone alarm of scan tool MB991502 sounds once when the ignition switch is operated (IG1/OFF) or front door switch [LH] and [RH] is operated (ON/OFF), the ETACS-ECU input signal for that switch circuit system is normal.
- Using a voltmeter
1. Use special tool MB991529 to connect a voltmeter between ground terminal 4 or 5 and the ETACS-ECU terminal of the data link connector.
2. If a voltmeter indicator deflects once when the ignition switch is operated (IG1/OFF) any door opens/closes (door switch ON/OFF) or front door switch [LH] and [RH] is operated (ON/OFF), the ETACS-ECU input signal for that switch circuit system is normal.
If the input signal of the front door switch [LH] or [RH] is not normal, go to Step 2.
If the input signal of the ignition switch (IG1) is not normal, go to Step 8.
If the input signal of the front door switch [LH], [RH] and ignition switch (IG1) are not normal, go to Step 11.
STEP 2. Check the battery power supply line at the ETACS-ECU connector C-86.
1. Remove the ETACS-ECU.
2. Connect the connector C-84 to the junction block.
3. Measure the voltage between terminal 2 and ground.
- Voltage should be approximately 12 volts (battery positive voltage).
If not approximately 12 volts, go to Step 3. If approximately 12 volts, go to Step 4.
STEP 3. Check the harness wires between battery and ETACS-ECU connector C-86.
If any harness wire between battery and ETACS-ECU connector C-86 is damaged, repair it. Then go to Step 15.
NOTE: After inspecting intermediate connector C-66 or C-84, inspect the wire. If intermediate connector C-66 or C-84 is damaged, repair or replace it. Refer to Harness Connector Inspection. Then go to Step 15.
STEP 4. Check the front door switch [LH] or [RH] continuity.
1. Remove the front door switch [LH] or [RH].
2. Check the continuity when the door switch is depressed (OFF) or undepressed (ON).
If the front door switch [LH] or [RH] is damaged, replace it. Then go to Step 15.
If the front door switch [LH] is not damaged, go to Step 5.
If the front door switch [RH] is not damaged, go to Step 6.
STEP 5. Check the harness wires between ETACS-ECU connector C-86 and front door switch [LH] connector D-21.
1. Connect the connector C-87 to the junction block.
2. Check the harness wires between ETACS-ECU connector C-86 and front door switch [LH] connector D-21.
If any harness wire between ETACS-ECU connector 0-86 and front door switch [LH] connector D-21 is damaged, repair it. Then go to Step 15.
If the harness wires are not damaged, go to Step 7.
NOTE: After inspecting intermediate connector C-67 or C-87, inspect the wire. If intermediate connector C-67 or C-87 is damaged, repair or replace it. Refer to Harness Connector Inspection. Then go to Step 15.
STEP 6. Check the harness wire between ETACS-ECU connector C-82 and front door switch [RH] connector D-08.
If any harness wire between ETACS-ECU connector C-82 and front door switch [RH] connector D-08 is damaged, repair it. Then go to Step 15.
If the harness wires are not damaged, go to Step 7.
NOTE: After inspecting intermediate connector C-69, inspect The wire. If intermediate connector C-69 is damaged, repair or replace it. Refer to Harness Connector Inspection. Then go to Step 15.
STEP 7. Check the harness wire between front door switch [LH] connector D-21 and ground or between front door [RH] connector D-08 and ground.
If any harness wire between front door switch [LH] connector D-21 and ground or between front door [RH] connector D-08 and ground is damaged, repair it. Then go to Step 15.
If the harness wires are not damaged, replace the ETACS-ECU. Then go to Step 15.
STEP 8. Check the ignition switch (IG1) power supply line at the ETACS-ECU connector C-86.
1. Remove the ETACS-ECU.
2. Connect the connector C-73 to the junction block.
3. Measure the voltage between terminal 11 and ground when the ignition switch is turned ON (IG1).
- Voltage should be approximately 12 volts (battery positive voltage).
If not approximately 12 volts, go to Step 9.
If approximately 12 volts, go to Step 10.
STEP 9. Check the harness wire between ignition switch (IG1) and ETACS-ECU connector C-86.
If any harness wire between ignition switch (IG1) and ETACS-ECU connector C-86 is damaged, repair it.
Then go to Step 15.
NOTE: After inspecting intermediate connector C-73, inspect the wire. If intermediate connector C-73 is damaged, repair or replace it. Refer to Harness Connector Inspection. Then go to Step 15.
STEP 10. Check the harness wire between ETACS-ECU connector C-86 and ground.
If any harness wire between ETACS-ECU connector C-86 and ground is damaged, repair it. Then go to Step 15.
It the harness wires are not damaged, replace the ETACS-ECU. Then go to Step 15.
NOTE: After inspecting intermediate connector C-73, inspect the wire. If intermediate connector C-73 is damaged, repair or replace it. Refer to Harness Connector Inspection. Then go to Step 15.
STEP 11. Check the power supply line at the FRONT-ECU connector A-09X.
1. Remove the FRONT-ECU and measure at the harness side.
2. Measure the voltage between terminal 16 and ground.
- Voltage should be approximately 12 volts (battery positive voltage) If not approximately 12 volts, go to Step 12. If approximately 12 volts, go to Step 13.
STEP 12. Check the harness wire between battery and FRONT-ECU connector A-09X.
If any harness wire between battery and FRONT-ECU is damaged, repair it. Then go to Step 15.
CAUTION: To prevent damage to the scan tool MB991502, make sure the ignition switch is "OFF" before connecting or disconnecting the scan tool MB991502.
STEP 13. Check the diagnostic trouble code.
Connect scan tool MB991502 to the data link connector, and then check the diagnostic trouble codes.
If diagnostic trouble code number 11 is displayed on the scan tool MB991502, replace the ETACS-ECU.
Then go to Step 15.
If diagnostic trouble code number 12 is displayed on the scan tool MB991502, go to Step 14.
If diagnostic trouble code number 13 is displayed on the scan tool MB991502, replace the FRONT-ECU.
Then go to Step 15.
If diagnostic trouble code number 21 is displayed on the scan tool MB991502, go to Step 14.
STEP 14. Check the harness wires between FRONT-ECU connector A-09X and ETACS-ECU connector C-82.
1. Remove the instrument panel side cover [LH].
2. Check the harness wires between FRONT-ECU connector A-09X and ETACS-ECU connector C-82.
If any harness wire between FRONT-ECU connector A-09X and ETACS-ECU connector C-82 is damaged, repair it.
Then go to Step 15.
NOTE: After inspecting intermediate connector C-66, inspect the wire. If intermediate connector C-66 is damaged, repair or replace it. Refer to Harness Connector Inspection. Then go to Step 15.
STEP 15. Check symptoms.
Confirm that the windows operate normally. When the front doors are closed, the windows can be opened or closed within 30 seconds after the ignition key is turned off.