Code No.U1515 No bus activity error for LIN
caution |
- 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 GROUP 54A, Immobilizer System - How to Register Key ID .)
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TROUBLE JUDGEMENT
The ETACS-ECU will store diagnosis code No. U1515 when no communication has been carried out for more than a certain period after it received last valid data.
PROBABLE CAUSES
- Malfunction of the ETACS-ECU
- Malfunction of the slave ECU
- LIN bus lines shorted to power supply
- LIN bus lines shorted to earth
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STEP 1. Measure the voltage at the LIN bus lines.
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Check the LIN bus lines for short to power supply.
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(1)Disconnect all the connectors leading to the LIN bus lines.
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(2)Turn the ignition switch from "LOCK" (OFF) to "ON" position.
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(3)Measure the voltage between the column switch connector (power supply terminal) and the body earth.
- The voltmeter needle does not swing.
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If the LIN bus lines are short to power supply, the voltmeter indicates a constant value.
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(4)Measure the voltage between the sunroof motor assembly connector (power supply terminal) and the body earth. <vehicles with sunroof>
- The voltmeter needle does not swing.
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If the LIN bus lines are short to power supply, the voltmeter indicates a constant value.
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(5)Measure the voltage between the lighting control sensor connector (power supply terminal) and the body earth. <vehicles with lighting control sensor>
- The voltmeter needle does not swing.
note |
If the LIN bus lines are short to power supply, the voltmeter indicates a constant value.
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(6)Measure the voltage between the security alarm sensor connector (power supply terminal) and the body earth. <vehicles with security alarm sensor>
- The voltmeter needle does not swing.
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If the LIN bus lines are short to power supply, the voltmeter indicates a constant value.
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Q.
Is the check result normal?
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Go to Step 2.
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Repair the connector(s) or wiring harness.
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STEP 2. Measure the resistance at the LIN bus lines.
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Check the LIN bus lines for short to earth.
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(1)Disconnect all the connectors leading to the LIN bus lines.
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(2)Measure the resistance between the column switch connector (earth terminal) and the body earth.
- No continuity (1 kΩ or more)
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(3)Measure the resistance between the sunroof motor assembly connector (earth terminal) and the body earth. <vehicles with sunroof>
- No continuity (1 kΩ or more)
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(4)Measure the resistance between the lighting control sensor connector (earth terminal) and the body earth. <vehicles with lighting control sensor>
- No continuity (1 kΩ or more)
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(5)Measure the resistance between the security alarm sensor connector (earth terminal) and the body earth. <vehicles with security alarm sensor>
- No continuity (1 kΩ or more)
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Q.
Is the check result normal?
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Go to Step 3.
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Repair the connector(s) or wiring harness.
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STEP 3. Check the column switch.
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Disconnect column switch connector, and recheck whether diagnosis code No. U1515 is stored.
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(1)Connect all the relevant ECUs, and disconnect column switch connector only.
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(2)Erase the diagnosis code.
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(3)Turn the ignition switch from "LOCK" (OFF) to "ON" position.
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(4)Check whether diagnosis code No. U1515 is stored.
note |
If diagnosis code No. U1515 is not stored, diagnosis code No. U1109 is stored because the column switch is disconnected. This is normal.
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(5)Turn the ignition switch to the "LOCK" (OFF) position.
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Q.
Is diagnosis code No. U1515 stored?
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Reconnect the column switch connector, and go to Step 4.
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Replace the wiper/washer switch <RHD> or lighting switch <LHD>.
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STEP 4. Check the sunroof motor assembly.
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Disconnect sunroof motor assembly connector, and recheck whether diagnosis code No. U1515 is stored.
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(1)Connect all the relevant ECUs, and disconnect sunroof motor assembly connector only.
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(2)Erase the diagnosis code.
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(3)Turn the ignition switch from "LOCK" (OFF) to "ON" position.
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(4)Check whether diagnosis code No. U1515 is stored.
note |
If diagnosis code No. U1515 is not stored, diagnosis code No. U0169 is stored because the sunroof motor assembly is disconnected. This is normal.
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(5)Turn the ignition switch to the "LOCK" (OFF) position.
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Q.
Is diagnosis code No. U1515 stored?
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Reconnect the sunroof motor assembly connector, and go to Step 5.
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Replace the sunroof motor assembly.
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STEP 5. Check the lighting control sensor.
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Disconnect lighting control sensor connector, and recheck whether diagnosis code No. U1515 is stored.
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(1)Connect all the relevant ECUs, and disconnect lighting control sensor connector only.
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(2)Erase the diagnosis code.
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(3)Turn the ignition switch from "LOCK" (OFF) to "ON" position.
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(4)Check whether diagnosis code No. U1515 is stored.
note |
If diagnosis code No. U1515 is not stored, diagnosis code No. U0231 is stored because the lighting control sensor is disconnected. This is normal.
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(5)Turn the ignition switch to the "LOCK" (OFF) position.
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Q.
Is diagnosis code No. U1515 stored?
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Reconnect the lighting control sensor, and go to Step 6.
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Replace the lighting control sensor.
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STEP 6. Check the security alarm sensor.
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Disconnect security alarm sensor connector, and recheck whether diagnosis code No. U1515 is stored.
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(1)Connect all the relevant ECUs, and disconnect security alarm sensor connector only.
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(2)Erase the diagnosis code.
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(3)Turn the ignition switch from "LOCK" (OFF) to "ON" position.
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(4)Check whether diagnosis code No. U1515 is stored.
note |
If diagnosis code No. U1515 is not stored, diagnosis code No. U1007 is stored because the security alarm sensor is disconnected. This is normal.
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(5)Turn the ignition switch to the "LOCK" (OFF) position.
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Q.
Is diagnosis code No. U1515 stored?
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Reconnect the security alarm sensor connector, and go to Step 7.
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Replace the security alarm sensor.
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STEP 7. Recheck for diagnosis code.
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Check again if the diagnosis code is stored 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) to "ON" position.
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(3)Check whether diagnosis code No. U1515 is stored.
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(4)Turn the ignition switch to the "LOCK" (OFF) position.
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Q.
Is the diagnosis code stored?
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Replace the ETACS-ECU.
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The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
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