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DTC B2350: Lighting switch
DTC B2351: Wiper switch
 
 
caution
  • Before replacing the ECU, ensure that the power supply circuit, the ground 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 .)
 
 
TROUBLE JUDGMENT
  • The ETACS-ECU receives the signals related to lighting and wiper/washer from the column switch. If the fail information data is included in the signal from column switch, DTC B2350 (malfunction of lighting switch) or B2351 (malfunction of wiper/washer switch) is set.
  • The steering wheel sensor is incorporated in the column switch assembly. When you replace the switch, you must always calibrate the sensor to make the ASC-ECU learn the neutral position of the steering wheel (Refer to GROUP 35C - On-vehicle service - Steering wheel sensor calibration ).
 
 
TECHNICAL DESCRIPTION (COMMENT)
The column switch or the ETACS-ECU may have a problem.
 
 
TROUBLESHOOTING HINTS
  • The column switch (integrated with the column-ECU) may be defective
  • The ETACS-ECU may be defective
 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-IIISE), read the DTC again.
Check again if the DTC is set in ETACS-ECU.
(1)
cautionTo prevent damage to scan tool (M.U.T.-IIISE), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-IIISE).
Connect scan tool (M.U.T.-IIISE). Refer to "How to connect the Scan Tool (M.U.T.-IIISE) ."
(2) Erase the DTC.
(3) Remove the ignition key from key cylinder and insert it again then turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
(4) On completion, check that the DTC is not set again.
Is the DTC set?
Go to Step 2.
The trouble can be an intermittent malfunction (GROUP 00 - How to Cope with Intermittent Malfunction ).
 
STEP 2. Using scan tool (M.U.T.-IIISE), read the DTC again.
Check again if the DTC is set in the ETACS-ECU.
(1) Replace the column 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 set.
Is the DTC set again?
Replace the ETACS-ECU.
The diagnosis is complete.