INSPECTION PROCEDURE P-7: The windshield intermittent wiper volume signal is not received.


caution Whenever the ECU is replaced, ensure that the input signal circuit is normal.


COMMENTS ON TROUBLE SYMPTOM
The intermittent wiper interval is calculated in accordance with the input signal from the windshield intermittent wiper volume. If this signal is abnormal, the wiper interval can not be adjusted.

POSSIBLE CAUSES

  • Malfunction of the column switch
  • Malfunction of the ETACS-ECU
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. Connector check: C-301 column switch connector.

Q. Is the check result normal?

Go to Step 2.

Repair the defective connector.

Step 2. Resistance measurement at the C-301 column switch connector.

(1)Disconnect the connector, and measure at the column switch side.

(2)Resistance between C-301 column switch connector terminal No.6 and body earth
OK: The resistance should rise from 0 to 1 kΩ when the windshield intermittent wiper volume is rotated from "Fast" to "Slow".

Q. Is the check result normal?

Go to Step 3.

Replace the column switch.

Step 3. Connector check: C-221 ETACS-ECU connector.

Q. Is the check result normal?

Go to Step 4.

Repair the defective connector.

Step 4. Check the wiring harness between C-301 column switch connector terminal No.6 to C-221 ETACS-ECU connector terminal No.66.



  • Check the input line for open circuit.

Q. Is the check result normal?

Go to Step 5.

Repair the wiring harness.

Step 5. SWS monitor data list.
<Selected item> ETACS ECU
  • Ignition switch: ACC
  • Wiper switch: INT
Item No.
 Item name
 Normal condition
Item 37
 INT WIPE TIME
 2.4 to 18.0 s
OK: The display will be changed as the intermittent wiper volume is rotated.

Q. Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
Replace the ETACS-ECU.