Step 4: Replace the ECU

1. Replace the column switch (turn-signal light and lighting switch).
2. If the equipment, which are described in CIRCUIT OPERATION , work normally, the input signal from the column switch (windshield wiper and washer switch) should be normal.

Does the column switch (windshield wiper and washer switch) send a normal signal to the ECU?

• YES
  
  No action to be taken.
• NO
  
  Replace the ETACS-ECU. If the equipment, which are described in CIRCUIT OPERATION , work normally, the input signal from the column switch (windshield wiper and washer switch) should be normal.