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DTC U1018 BSW CAN timeout
 
 
caution
  • If DTC No. U1018 is set in the ETACS-ECU, always diagnose the CAN bus line.
  • Before replacing the ECU, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.
 
 
DIAGNOSTIC FUNCTION
If the signal from BSW-ECU (master) cannot be received, the ETACS-ECU sets DTC No. U1018.
 
 
JUDGMENT CRITERIA
After the following statuses continue to be true for 5 seconds, if the communication with the BSW-ECU (master) cannot be established for 2,500 ms or more, the ETACS-ECU determines that a problem has occurred.
  • No abnormality is present to the network.
  • Ignition switch is in the ON position.
  • No abnormality is present to the power supply fuse (IOD fuse), or the odometer value is at 80.5 km (50.0 miles) or more.
  • ETACS-ECU system voltage is at 10-16 Volts.
 
 
TROUBLESHOOTING HINTS
  • Malfunction of the BSW-ECU (master)
  • Malfunction of the ETACS-ECU
  • Malfunction of the CAN bus
 
 
DIAGNOSIS
STEP 1. scan tool (M.U.T.-III) CAN bus diagnostics
(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 the Scan Tool (M.U.T.-III) ."
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the check result normal?
Go to Step 2.
Repair the CAN bus lines. (Refer to GROUP 54C - Troubleshooting ).
 
STEP 2. Scan tool (M.U.T.-III) other system DTC
Check if DTC is set in the BSW-ECU (master).
Is the DTC set?
Troubleshoot the Blind Spot Warning [BSW] (with Lane Change Assist) (Refer to ).
Go to Step 3.
 
STEP 3. Check whether the DTC is set again.
Check again if the DTC is set in the ETACS-ECU.
(1) Erase the DTC.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(3) Check if DTC is set.
Is the DTC set?
Replace the BSW-ECU (master), and then go to Step 4.
The trouble can be an intermittent malfunction such as a poor connection or open circuit in the CAN bus lines between the BSW-ECU (master) and the ETACS-ECU (GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
 
STEP 4. Check whether the DTC is set again.
Check again if the DTC is set in the ETACS-ECU.
(1) Erase the DTC.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(3) Check if DTC is set.
Is the DTC set?
Replace the ETACS-ECU.
The trouble can be an intermittent malfunction such as a poor connection or open circuit in the CAN bus lines between the BSW-ECU (master) and the ETACS-ECU (GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).