Code No.U1515 No-Bus activity error (LIN)


TROUBLE JUDGEMENT



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

DIAGNOSIS PROCEDURE


STEP 1. Check the following connectors.




  • C-411 and C-416 ETACS-ECU connectors
  • C-314 Column switch connector
  • F-13 Power window main switch connector
  • E-08 Lighting control sensor connector <vehicles with lighting control sensor>
  • E-03 Security alarm sensor connector <vehicles with security alarm sensor>
  • A-64 Security alarm siren connector <vehicles with security alarm sensor>
  • C-02 LIN cutoff control unit connector <vehicles with security alarm sensor>

Q. Are all the connectors in good condition?





STEP 2. LIN cutoff control unit check



Q. Is the check result normal?





STEP 3. Check the following wiring harness.




  • Wiring harness from C-411 ETACS-ECU connector terminal No.1 to C-314 column switch connector terminal No.3.
  • Wiring harness from C-411 ETACS-ECU connector terminal No.1 to F-13 power window main switch connector terminal No.7.
  • Wiring harness from C-416 ETACS-ECU connector terminal No.1 to E-08 lighting control sensor connector terminal No.3. <vehicles with lighting control sensor>
  • Wiring harness from C-416 ETACS-ECU connector terminal No.1 to E-03 security alarm sensor connector terminal No.2. <vehicles with security alarm sensor>
  • Wiring harness from C-411 ETACS-ECU connector terminal No.1 to A-64 Security alarm siren connector terminal No.3. <vehicles with security alarm sensor>
note Prior to the wiring harness inspection, check intermediate connectors A-04, C-128, C-212 and E-02, and joint connector C-102, and repair if necessary.

Q. Are all the wiring harness wires in good condition?





STEP 4. Measure the voltage at the LIN bus lines.



(1)Disconnect all the connectors which are connecter to the LIN bus lines.
(2)Turn the ignition switch from "LOCK" (OFF) to "ON" position.
(3)Measure the voltage between C-314 column switch connector terminal No.3 and earth.

  • The voltmeter needle does not swing.
note If the LIN bus lines are short to power supply, the voltmeter indicates a constant value.
(4)Measure the voltage between F-13 power window main switch connector terminal No.7 and earth.

  • The voltmeter needle does not swing.
note If the LIN bus lines are short to power supply, the voltmeter indicates a constant value.
(5)Measure the voltage between E-08 lighting control sensor connector terminal No.3 and 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.
(6)Measure the voltage between E-03 security alarm sensor connector terminal No.3 and earth. <vehicles with security alarm sensor>

  • The voltmeter needle does not swing.
note If the LIN bus lines are short to power supply, the voltmeter indicates a constant value.
(7)Measure the voltage between A-64 security alarm siren connector terminal No.3 and earth. <vehicles with security alarm sensor>

  • The voltmeter needle does not swing.
note If the LIN bus lines are short to power supply, the voltmeter indicates a constant value.

Q. Is the check result normal?





STEP 5. Measure the resistance at the LIN bus lines.



(1)Disconnect all the connectors which are connecter to the LIN bus lines.
(2)Measure the resistance value between C-314 column switch connector terminal No.3 and earth.

  • No continuity (1 kΩ or more)
(3)Measure the resistance value between F-13 power window main switch connector terminal No.7 and earth.

  • No continuity (1 kΩ or more)
(4)Measure the resistance value between E-08 lighting control sensor connector terminal No.3 and earth. <vehicles with lighting control sensor>

  • No continuity (1 kΩ or more)
(5)Measure the resistance value between E-03 security alarm sensor connector terminal No.3 and earth. <vehicles with security alarm sensor>

  • No continuity (1 kΩ or more)
(6)Measure the resistance value between A-64 security alarm siren connector terminal No.3 and earth. <vehicles with security alarm sensor>

  • No continuity (1 kΩ or more)

Q. Is the check result normal?





STEP 6. Check the column switch.



(1)Connect all the relevant ECUs, and disconnect C-314 column switch connector only.
(2)Erase the diagnosis code.
(3)Turn the ignition switch from "LOCK" (OFF) to "ON" position.
(4)Check whether diagnosis code No. U1515 is set.
note If diagnosis code No. U1515 is not set, diagnosis code No. U1109 is set because the column switch is disconnected. This is normal.
(5)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is diagnosis code No. U1515 set?





STEP 7. Check the power window main switch.



(1)Connect all the relevant ECUs, and disconnect E-18 power window main switch connector only.
(2)Erase the diagnosis code.
(3)Turn the ignition switch from "LOCK" (OFF) to "ON" position.
(4)Check whether diagnosis code No. U1515 is set.
note If diagnosis code No. U1515 is not set, diagnosis code No. U0215 is set because the power window main switch is disconnected. This is normal.
(5)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is diagnosis code No. U1515 set?





STEP 8. Check the lighting control sensor.



(1)Connect all the relevant ECUs, and disconnect E-18 lighting control sensor connector only.
(2)Erase the diagnosis code.
(3)Turn the ignition switch from "LOCK" (OFF) to "ON" position.
(4)Check whether diagnosis code No. U1515 is set.
note If diagnosis code No. U1515 is not set, diagnosis code No. U0231 is set because the sunroof motor assembly is disconnected. This is normal.
(5)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is diagnosis code No. U1515 set?





STEP 9. Check the security alarm sensor.



(1)Connect all the relevant ECUs, and disconnect E-03 security alarm sensor connector only.
(2)Erase the diagnosis code.
(3)Turn the ignition switch from "LOCK" (OFF) to "ON" position.
(4)Check whether diagnosis code No. U1515 is set.
note If diagnosis code No. U1515 is not set, diagnosis code No. U1007 is set because the security alarm sensor is disconnected. This is normal.
(5)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is diagnosis code No. U1515 set?





STEP 10. Check the security alarm siren.



(1)Connect all the relevant ECUs, and disconnect A-64 security alarm siren connector only.
(2)Erase the diagnosis code.
(3)Turn the ignition switch from "LOCK" (OFF) to "ON" position.
(4)Check whether diagnosis code No. U1515 is set.
note If diagnosis code No. U1515 is not set, diagnosis code No. U1006 is set because the security alarm siren is disconnected. This is normal.
(5)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is diagnosis code No. U1515 set?





STEP 11. Recheck for diagnosis code.



(1)Erase the diagnosis code.
(2)Turn the ignition switch from "LOCK" (OFF) to "ON" position.
(3)Check whether diagnosis code No. U1515 is set.
(4)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the diagnosis code set?