Code No.U1570 No bus activity error for 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.










Check the following connectors:

  • C-219 ETACS-ECU connector
  • C-302 column switch connector
  • D-38 lighting control sensor connector
  • E-03 power window main switch connector
  • E-26 front power window sub switch connector
  • E-13 rear power window sub switch (LH) connector
  • E-06 rear power window sub switch (RH) connector
  • D-11 rear panel power window-ECU connector

Q. Are all the connectors in good condition?

Go to Step 2.

Repair the defective connector.

STEP 2. Measure the voltage at the LIN bus lines.
Check the LIN bus lines for short to power supply.
(1)Disconnect all the ECU connectors which are connected to the LIN bus lines.
(2)Turn the ignition switch from "LOCK" (OFF) to "ON" position.
(3)Measure the voltage between C-302 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.

Q. Is the check result normal?
Go to Step 3.
Repair the wiring harness.

STEP 3. Measure the resistance at the LIN bus lines.
Check the LIN bus lines for short to earth.
(1)Disconnect all the ECU connectors which are connected to the LIN bus lines.
(2)Measure the resistance value between C-302 column switch connector terminal No.3 and earth.

  • No continuity (1 kΩ or more)

Q. Is the check result normal?
Go to Step 4.
Repair the wiring harness.

STEP 4. Check the column switch.


Disconnect C-302 column switch connector, and recheck whether diagnosis code No. U1570 is set.
(1)Connect all the relevant ECUs, and disconnect C-302 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. U1570 is set.
note If diagnosis code No. U1570 is not set, diagnosis code No. U1500 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. U1570 set?

Reconnect the column switch connector, and go to Step 5.

Replace the lighting switch.

STEP 5. Check the lighting control sensor.


Disconnect D-38 lighting control sensor connector, and recheck whether diagnosis code No. U1570 is set.
(1)Connect all the relevant ECUs, and disconnect D-38 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. U1570 is set.
note If diagnosis code No. U1570 is not set, diagnosis code No. U1504 is set because the lighting control sensor is disconnected. This is normal.
(5)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is diagnosis code No. U1570 set?

Reconnect the lighting control sensor connector, and go to Step 6.

Replace the lighting control sensor.

STEP 6. Check the power window main switch.

Disconnect E-03 power window main switch connector, and recheck whether diagnosis code No. U1570 is set.
(1)Connect all the relevant ECUs, and disconnect E-03 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. U1570 is set.
note If diagnosis code No. U1570 is not set, diagnosis code No. U1508 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. U1570 set?

Reconnect the power window main switch connector, and go to Step 7.

Replace the power window main switch.

STEP 7. Check the front power window sub switch.

Disconnect E-26 front power window sub switch connector, and recheck whether diagnosis code No. U1570 is set.
(1)Connect all the relevant ECUs, and disconnect E-26 front power window sub 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. U1570 is set.
note If diagnosis code No. U1570 is not set, diagnosis code No. U1509 is set because the front power window sub switch is disconnected. This is normal.
(5)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is diagnosis code No. U1570 set?

Reconnect the front power window sub switch connector, and go to Step 8.

Replace the front power window sub switch.

STEP 8. Check the rear power window sub switch (LH).

Disconnect E-13 rear power window sub switch (LH) connector, and recheck whether diagnosis code No. U1570 is set.
(1)Connect all the relevant ECUs, and disconnect E-13 rear power window sub switch (LH) connector only.
(2)Erase the diagnosis code.
(3)Turn the ignition switch from "LOCK" (OFF) to "ON" position.
(4)Check whether diagnosis code No. U1570 is set.
note If diagnosis code No. U1570 is not set, diagnosis code No. U1510 is set because the rear power window sub switch (LH) is disconnected. This is normal.
(5)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is diagnosis code No. U1570 set?

Reconnect the rear power window sub switch (LH) connector, and go to Step 9.

Replace the rear power window sub switch (LH).

STEP 9. Check the rear power window sub switch (RH).

Disconnect E-06 rear power window sub switch (RH) connector, and recheck whether diagnosis code No. U1570 is set.
(1)Connect all the relevant ECUs, and disconnect E-06 rear power window sub switch (RH) connector only.
(2)Erase the diagnosis code.
(3)Turn the ignition switch from "LOCK" (OFF) to "ON" position.
(4)Check whether diagnosis code No. U1570 is set.
note If diagnosis code No. U1570 is not set, diagnosis code No. U1511 is set because the rear power window sub switch (RH) is disconnected. This is normal.
(5)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is diagnosis code No. U1570 set?

Reconnect the rear power window sub switch (RH) connector, and go to Step 10.

Replace the rear power window sub switch (RH).

STEP 10. Check the rear panel power window-ECU.

Disconnect D-11 rear panel power window-ECU connector, and recheck whether diagnosis code No. U1570 is set.
(1)Connect all the relevant ECUs, and disconnect D-11 rear panel power window-ECU connector only.
(2)Erase the diagnosis code.
(3)Turn the ignition switch from "LOCK" (OFF) to "ON" position.
(4)Check whether diagnosis code No. U1570 is set.
note If diagnosis code No. U1570 is not set, diagnosis code No. U1512 is set because the rear panel power window-ECU is disconnected. This is normal.
(5)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is diagnosis code No. U1570 set?

Reconnect the rear panel power window-ECU connector, and go to Step 11.

Replace the rear panel power window-ECU.

STEP 11. Recheck for diagnosis code.
Check again if the diagnosis code is set to 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. U1570 is set.
(4)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the diagnosis code set?
Replace the ETACS-ECU and register the ID codes (Refer to GROUP 54A, Immobilizer System - On-vehicle service ).
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunctions ).