Code No.U1500: Column ECU LIN timeout
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When the diagnosis codes relating to the LIN communication error are output, make sure of the vehicle equipment. When the vehicle is not equipped with the system the ETACS-ECU communicates to, the diagnosis code is always output. This is not abnormal.
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TROUBLE JUDGMENT
The ETACS-ECU receives signal from the column switch. If signal cannot be received at all, diagnosis code No.U1500 will be set.
COMMENT ON TROUBLE SYMPTOM
The M.U.T.-III shows a diagnosis code status as active.
- Connector(s) or wiring harness in the LIN bus lines between the column switch and the ETACS-ECU, the power supply system of the column switch, or the column switch itself may be defective.
The M.U.T.-III shows a diagnosis code status as stored.
- If diagnosis code No.U1500 is stored as a past trouble, carry out diagnosis with particular emphasis on wiring and connector(s) in the LIN bus line between the column switch and the ETACS-ECU, and the power supply system of the column switch. For diagnosis procedures, refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Treat Past Trouble
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PROBABLE CAUSES
- Malfunction of the lighting switch <LHD>
- Malfunction of the wiper/washer switch <RHD>
- Damaged harness wires and connectors
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STEP 1. Connector check: C-219 ETACS-ECU connector, C-302 column switch connector
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Q.
Is the check result normal?
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 Go to Step 2.
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 Repair the defective connector. Go to Step 3.
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STEP 2. Check the wiring harness between C-219 ETACS-ECU connector terminal No.54 and C-302 column switch connector terminal No.3.
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- Check the communication line for open circuit.
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Q.
Is the check result normal?
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Go to Step 3.
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Repair the wiring harness. Go to Step 3.
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STEP 3. Check whether the diagnosis code is reset.
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Check again if the diagnosis code is set to 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?
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Replace the lighting switch <LHD> or wiper/washer switch <RHD>.
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A poor connection, open circuit or other intermittent malfunction is present in the LIN bus lines between the column switch and the ETACS-ECU (Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).
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