If the transmission and reception of the inquiry and response data between the system LSI and microcomputer are abnormal, the diagnosis code No. P1602 will be set.
PROBABLE CAUSES
Malfunction of the EV-ECU
DIAGNOSIS PROCEDURE
STEP 1. Diagnosis code recheck
Check again if the diagnosis code is set to the EV-ECU.
(1)Erase the stored diagnosis code.
(2)Set the electric motor switch from the LOCK (OFF) position to the ON position.
(3)Check if the diagnosis code is set.
Q.
Is the diagnosis code set?
Replace the EV-ECU. (Refer to .) Then go to Step 2.
The diagnosis is complete.
STEP 2. Diagnosis code recheck
Check again if the diagnosis code is set to the EV-ECU.
(1)Erase the stored diagnosis code.
(2)Set the electric motor switch from the LOCK (OFF) position to the ON position.
Replace the EV-ECU. (Refer to 
.) Then go to Step 2.
The diagnosis is complete.