INSPECTION PROCEDURE C-1: Power windows do not work at all.
caution
Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.
When the ETACS-ECU of vehicles without KOS is replaced, the encrypted code of the ignition key needs to be registered to the ETACS-ECU. (If the encrypted code is not registered, the engine cannot be started. Register the encrypted code as described in Immobilizer System - How to Register Key ID .)
COMMENTS ON TROUBLE SYMPTOM
If the power windows do not work at all, a malfunction of the power supply or ETACS-ECU is suspected.
PROBABLE CAUSES
Malfunction of ETACS-ECU
Damaged wiring harness and connectors
DIAGNOSTIC PROCEDURE
STEP 1. Check the power supply system.
With the ignition switch in the LOCK (OFF) position, check if the following function operates normally:
Hazard warning lamp
Q.
Is the check result normal?
Go to Step 2
Refer to GROUP 54A - Malfunction of ETACS-ECU Power Supply Circuit .
STEP 2. M.U.T.-III diagnosis code
Check that ETACS-ECU sets a diagnosis code.
Q.
Is the diagnosis code set?
Refer to GROUP 54A - Diagnosis Code Chart .
Go to Step 3
STEP 3. M.U.T.-III data list
Check the ETACS-ECU service item related to the power window.
Item No.
Item name
Normal condition
254
IG Voltage
System voltage
OK: Normal condition is displayed.
Q.
Is the check result normal?
Go to Step 4
Refer to GROUP 54A - Inspection Procedure 2: The ignition switch (IG1) signal is not received .
STEP 4. Voltage measurement at the ETACS-ECU connector (+B1 terminal).
(1)Disconnect the connector, and measure at the wiring harness side.
(2)Measure the voltage between the ETACS-ECU connector (+B1 terminal) and body earth. OK: System voltage
Q.
Is the check result normal?
Go to Step 6
Go to Step 5
STEP 5. Check of short to power supply, short to earth, and open circuit in +B1 line between ETACS-ECU connector and fusible link.
Q.
Is the check result normal?
No action is necessary and testing is complete.
Repair the connector(s) or wiring harness.
STEP 6. Voltage measurement at the ETACS-ECU connector (IOD1 terminal).
(1)Disconnect the connector, and measure at the wiring harness side.
(2)Measure the voltage between the ETACS-ECU connector (IOD1 terminal) and body earth. OK: System voltage
Q.
Is the check result normal?
Go to Step 8
Go to Step 7
STEP 7. Check of short to power supply, short to earth, and open circuit in IOD1 line between ETACS-ECU connector and fusible link.
Q.
Is the check result normal?
No action is necessary and testing is complete.
Repair the connector(s) or wiring harness.
STEP 8. Voltage measurement at the power window main switch connector (+BP terminal).
(1)Disconnect the connector, and measure at the wiring harness side.
(2)Measure the voltage between the power window main switch connector (+BP terminal) and body earth. OK: System voltage
Q.
Is the check result normal?
Go to Step 10
Go to Step 9
STEP 9. Check of short to power supply, short to earth, and open circuit in +BP line between ETACS-ECU connector and power window main switch connector.
Q.
Is the check result normal?
No action is necessary and testing is complete.
Repair the connector(s) or wiring harness.
STEP 10. Resistance measurement at the power window main switch connector (E, DL terminal).
(1)Disconnect the connector, and measure at the wiring harness side.
(2)Measure the resistance between the power window main switch connector (E, DL terminal) and body earth. OK: Continuity exists (2 Ω or less)
Q.
Is the check result normal?
Go to Step 12
Go to Step 11
STEP 11. Check of open circuit in E, DL line between power window main switch connector and body earth.
Q.
Is the check result normal?
YES : No action is necessary and testing is complete.
Repair the connector(s) or wiring harness.
STEP 12. Retest the system.
(1)Make the power widows learn their fully closed position.()
(2)Check that the all power windows work normally.
Go to Step 2
Refer to GROUP 54A - Malfunction of ETACS-ECU Power Supply Circuit 
.