Code No.4008: P/W (RR) Parameter read fail
Code No.4009: P/W (RR) Position read fail

caution

Whenever the ECU is replaced, ensure that the input and output signal circuits are normal.

COMMENTS ON TROUBLE SYMPTOM

Current trouble

At the engine startup, if a signal reception of the rear power window sub switch (RH) information fails, ETACS-ECU stores the diagnosis code No. 4008.
At the engine startup, if a signal reception of the rear right door window glass position fails, ETACS-ECU sets the diagnosis code No. 4009.

Past trouble

If the diagnosis code No. 4008 or 4009 is set as past trouble, carry out diagnosis with particular emphasis on wiring and connector(s) in the CAN bus line. For diagnosis procedures, refer to How to cope with past trouble (Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Treat Past Trouble

note

For a past trouble, you cannot find it by the M.U.T.-III CAN bus diagnostics even if there is any failure in CAN bus lines. In this case, refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Treat Past Trouble

and check the CAN bus lines. You can narrow down the possible cause of the trouble by referring to the diagnosis code, which is set regarding the CAN communication-linked ECUs (Refer to GROUP 54C - Explanation About The M.U.T.-III CAN Bus Diagnostics

PROBABLE CAUSES

Malfunction of the rear power window sub switch (RH)

DIAGNOSIS PROCEDURE

Check whether the diagnosis code is reset.

Check that the diagnosis code is not reset.

Q. Is diagnosis code set?

	Replace the rear power window sub switch (RH).