[ Model - ECLIPSE CROSS / Year - 2018 ]
2018 / ECLIPSE CROSS / EC - Workshop Manual
54 -CHASSIS ELECTRICAL > 54B-LOCAL INTERCONNECT NETWORK (LIN) > TROUBLESHOOTING > DIAGNOSIS CODE PROCEDURES > CODE NO. U1515 BUS ERROR (LIN)
Code No.U1515 No bus activity error for LIN
 
 
cautionBefore replacing the ECU, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.
 
 
TROUBLE JUDGEMENT
The ETACS-ECU will set 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
 
 
DIAGNOSIS PROCEDURE
STEP 1. Measure the voltage at the LIN bus lines.
Check the LIN bus lines for short to power supply.
(1) Disconnect all the connectors leading to the LIN bus lines.
(2) Turn the ignition switch from "LOCK" (OFF) to "ON" position.
(3) Measure the voltage between the column switch connector (DATA terminal) and the body earth.
  • The voltmeter needle does not swing.
noteIf the LIN bus lines are short to power supply, the voltmeter indicates a constant value.
(4) Measure the voltage between the sunroof motor assembly connector (LIN2 terminal) and the body earth. <Vehicles with sunroof>
  • The voltmeter needle does not swing.
noteIf the LIN bus lines are short to power supply, the voltmeter indicates a constant value.
(5) Measure the voltage between the lighting control sensor connector (LIN2 terminal) and the body earth.
  • The voltmeter needle does not swing.
noteIf the LIN bus lines are short to power supply, the voltmeter indicates a constant value.
(6) Measure the voltage between the security alarm sensor connector (LIN2 terminal) and the body earth. <Vehicles with security alarm sensor>
  • The voltmeter needle does not swing.
noteIf the LIN bus lines are short to power supply, the voltmeter indicates a constant value.
Is the check result normal?
Go to Step 2.
Repair the connector(s) or wiring harness.
 
STEP 2. Measure the resistance at the LIN bus lines.
Check the LIN bus lines for short to earth.
(1) Disconnect all the connectors leading to the LIN bus lines.
(2) Measure the resistance between the column switch connector (DATA terminal) and the body earth.
  • No continuity (1 kΩ or more)
(3) Measure the resistance between the sunroof motor assembly connector (LIN2 terminal) and the body earth. <Vehicles with sunroof>
  • No continuity (1 kΩ or more)
(4) Measure the resistance between the lighting control sensor connector (LIN2 terminal) and the body earth.
  • No continuity (1 kΩ or more)
(5) Measure the resistance between the security alarm sensor connector (LIN2 terminal) and the body earth. <Vehicles with security alarm sensor>
  • No continuity (1 kΩ or more)
Is the check result normal?
Go to Step 3.
Repair the connector(s) or wiring harness.
 
STEP 3. Check the column switch.
Disconnect column switch connector, and recheck whether diagnosis code No. U1515 is set.
(1) Connect all the relevant ECUs, and disconnect 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.
noteIf 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.
Is diagnosis code No. U1515 set?
Reconnect the column switch connector, and go to Step 4.
Replace the column switch (Refer to GROUP 54A - Column switch ).
 
STEP 4. Check the sunroof motor assembly.
Disconnect sunroof motor assembly connector, and recheck whether diagnosis code No. U1515 is set.
(1) Connect all the relevant ECUs, and disconnect sunroof motor assembly 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.
noteIf diagnosis code No. U1515 is not set, diagnosis code No. U0169 is set because the sunroof motor assembly is disconnected. This is normal.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Is diagnosis code No. U1515 set?
Reconnect the sunroof motor assembly connector, and go to Step 5.
Replace the sunroof motor assembly (Refer to GROUP 42A - Sunroof Assembly ).
 
STEP 5. Check the lighting control sensor.
Disconnect lighting control sensor connector, and recheck whether diagnosis code No. U1515 is set.
(1) Connect all the relevant ECUs, and disconnect 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.
noteIf diagnosis code No. U1515 is not set, diagnosis code No. U0231 is set because the lighting control sensor is disconnected. This is normal.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Is diagnosis code No. U1515 set?
Reconnect the lighting control sensor, and go to Step 6.
Replace the lighting control sensor (Refer to GROUP 54A - Lighting Control Sensor ).
 
STEP 6. Check the security alarm sensor.
Disconnect security alarm sensor connector, and recheck whether diagnosis code No. U1515 is set.
(1) Connect all the relevant ECUs, and disconnect 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.
noteIf 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.
Is diagnosis code No. U1515 set?
Reconnect the security alarm sensor connector, and go to Step 7.
Replace the security alarm sensor (Refer to GROUP 54A - Security Alarm Sensor Removal And Installation ).
 
STEP 7. Recheck for diagnosis code.
Check again if the diagnosis code is set in the ETACS-ECU.
(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.
Is the diagnosis code set?
Replace the ETACS-ECU (Refer to GROUP 54A - ETACS-ECU ).
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).