Code No.U1504:
Lighting control sensor LIN timeout <Vehicles with auto lamp>
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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 JUDGEMENT
The ETACS-ECU receives signal from the lighting control sensor. If signal cannot be received
at all, diagnosis code No.U1504 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 lighting control
sensor and the ETACS-ECU, the power supply system of the lighting control sensor, or the lighting
control sensor itself may be defective.
The M.U.T.-III shows a diagnosis code status as stored.
- If diagnosis code No.U1504 is stored as a past trouble, carry out diagnosis with
particular emphasis on wiring and connector(s) in the LIN bus line between the lighting control
sensor and the ETACS-ECU, and the power supply system of the lighting control sensor. 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 control sensor
- Damaged harness wires and connectors
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STEP 1. Connector check: C-206 junction block connector, C-219
ETACS-ECU connector, D-42 lighting control sensor 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 7.
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STEP 2. Resistance measurement at the D-42 lighting control sensor
connector
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Measure the resistance between the D-42 lighting control sensor connector terminal
No. 2 and the body earth.
OK: Continuity exists (2 Ω or less)
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Q.
Is the check result normal?
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Go to Step 4.
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Go to Step 3.
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STEP 3. Check the wiring harness between D-42 lighting control sensor
connector terminal No. 2 to body earth
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Check the earth wires for open circuit.
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Q.
Is the check result normal?
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The trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to use Troubleshooting/inspection Service Points - How to Cope with Intermittent
Malfunction ).
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Repair the wiring harness.
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STEP 4. Voltage measurement at the D-42 lighting control sensor connector.
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Measure the voltage between the D-42 lighting control sensor connector terminal
No. 1 and the body earth.
OK: System voltage
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Q.
Is the check result normal?
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Go to Step 6.
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Go to Step 5.
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STEP 5. Check the wiring harness between C-206 junction block connector
terminal No. 3 and D-42 lighting control sensor connector terminal No. 1
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Check the power supply line for open circuit and short circuit.
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Q.
Is the check result normal?
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The trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to use Troubleshooting/inspection Service Points - How to Cope with Intermittent
Malfunction ).
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Repair the wiring harness.
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STEP 6. Check the wiring harness between C-219 ETACS-ECU connector
terminal No. 54 and D-42 lighting control sensor connector terminal No. 3.
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Check the communication lines for open circuit.
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Prior to the wiring harness inspection, check joint connector C-106 and intermediate connector
C-43, and repair if necessary.
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Q.
Is the check result normal?
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Go to Step 7.
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Repair the wiring harness. Go to Step 7.
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STEP 7. 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 control sensor.
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A poor connection, open circuit or other intermittent malfunction is present in
the LIN bus lines between the lighting control sensor 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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)
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