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DTC B1763: Lighting switch
DTC B1764: Wiper switch
 
 
cautionWhenever the ECU is replaced, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.
 
 
TECHNICAL DESCRIPTION (COMMENT)
  • If the ETACS-ECU receives the lighting switch fail signal, the ETACS-ECU stores the DTC B1763.
  • If the ETACS-ECU receives the wiper/washer switch fail signal, the ETACS-ECU stores the DTC B1764.
 
 
TROUBLESHOOTING HINTS
  • The lighting switch (with built-in column-ECU) may be defective
  • The wiper/washer switch may be defective
  • The ETACS-ECU may be defective
 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-III), Check whether the diagnostic trouble code is reset.
(1)
cautionTo prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-III).
Connect scan tool (M.U.T.-III). Refer to "How to connect Scan Tool (M.U.T.-III) ."
(2) Turn the ignition switch to the "ON" position.
(3) Erase the DTC.
(4) Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(5) Check if the DTC B1763 or B1764 is stored.
Is the DTC stored?
DTC B1763 is stored. : Go to Step 3.
DTC B1764 is stored. : Go to Step 2.
No DTC is stored. : The trouble can be an intermittent malfunction (GROUP 00 - How to Cope with Intermittent Malfunction ).
 
STEP 2. Using scan tool (M.U.T.-III), Check whether the diagnostic trouble code is reset.
Check again if the DTC is stored in the ETACS-ECU.
(1) Replace the windshield wiper and washer switch.
(2) Erase the DTC.
(3) Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(4) Check if DTC is stored.
Is the DTC reset?
Go to Step 3.
The diagnosis is complete.
 
STEP 3. Using scan tool (M.U.T.-III), Check whether the diagnostic trouble code is reset.
Check again if the DTC is stored in the ETACS-ECU.
(1) Replace the lighting switch (with built-in column-ECU).
(2) Erase the DTC.
(3) Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(4) Check if DTC is stored.
Is the DTC reset?
Replace the ETACS-ECU.
The diagnosis is complete.