Code No.U1018
BSW CAN timeout
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- If diagnosis
code 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 earth 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.)
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DIAGNOSTIC FUNCTION
If the signal from BSW-ECU (master) cannot be received, the ETACS-ECU sets diagnosis code
No. U1018.
JUDGEMENT 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 or more.
- ETACS-ECU system voltage is at 10-16 V.
PROBABLE CAUSES
- Malfunction of the BSW-ECU (master)
- Malfunction of the ETACS-ECU
- Malfunction of the CAN bus
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.
Q.
Is the check result normal?
Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting).
STEP 2. M.U.T.-III other system diagnosis code
Check if diagnosis code is set in the BSW-ECU (master).
Q.
Is the diagnosis code set?
Troubleshoot the Blind Spot Warning [BSW] (with Lane Change
Assist) (Refer to 
).
Go to Step 3.
STEP 3. Check whether the diagnosis code is set again.
Check again if the diagnosis code is set in the ETACS-ECU.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
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(3)Check if diagnosis code is set.
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Q.
Is the diagnosis code 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 diagnosis code is set again.
Check again if the diagnosis code is set in the ETACS-ECU.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
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(3)Check if diagnosis code is set.
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Q.
Is the diagnosis code set?
Replace the ETACS-ECU, and then return to Step 1.
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).