Before replacing the ECU,
ensure that the input and output signal circuits are normal.
COMMENTS ON TROUBLE SYMPTOM
If the pulse 1 signal from the front power window motor (LH) cannot be received, the power
window main switch sets the diagnosis trouble code No. L0730.
PROBABLE CAUSES
Malfunction of the front power window motor (driver’s
side)
Malfunction of the power window main switch
Damaged wiring harness and connectors
DIAGNOSTIC PROCEDURE
STEP 1. Connector check: E-18 power window main switch
connector, E-15 front power window motor (driver’s side) connector
Q.
Is the check result normal?
Go to Step 2.
Repair the defective connector.
STEP 2. Check of the wiring harness between the E-18 power window
main switch connector terminal Nos. 8, 10, 12 and the E-15 front power window motor (driver’s
side) connector terminal Nos. 5, 3, 6
Check the input/output lines for open circuit and short circuit.
Q.
Is the check result normal?
Go to Step 3.
Repair the wiring harness.
STEP 3. Diagnosis code recheck
Replace the front power window motor (driver’s side). Recheck if the diagnosis
code is set.
(1)Erase the diagnosis code.
(2)Turn the ignition switch from the LOCK (OFF) position to the ON position.
)
)
)
Go to Step 2.
Repair the defective connector.