[Previous][Next]
Inspection Procedure 13: Vehicle power does not turn "ON". (not possible with both of power supply mode "ACC" and "ON")
 
 
cautionBefore replacing the ECU, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.
 
 
 
 
TECHNICAL DESCRIPTION (COMMENT)
When the vehicle power does not turn "ON" (not possible with both of power supply mode "ACC" and "ON"), the battery, CAN bus line, KOS&OSS-ECU, KOS&OSS-ECU power supply, or ground circuit may have a problem.
noteKOS&OSS-ECU can communicate with the scan tool (M.U.T.-III) even when the engine switch is in the OFF position.
 
 
TROUBLESHOOTING HINTS
  • Malfunction of battery
  • Damaged wiring harness and connectors
  • Malfunction of engine switch (poor connector contact, poor engine switch contact)
  • Malfunction of the CAN bus line
  • Malfunction of KOS&OSS-ECU
  • Malfunction of the keyless operation key battery
 
 
DIAGNOSIS
notePrior to diagnosis, read "Troubleshooting procedure when vehicle power does not turn on" .
STEP 1. Battery check.
Perform the battery test to check the battery status (Refer to GROUP 54A, Battery ).
Is the check result normal?
Go to Step 2.
Replace the battery.
 
STEP 2. Using scan tool (M.U.T.-III), diagnose the CAN bus line.
(1)
cautionTo prevent damage to scan tool (M.U.T.-III), always turn the power supply mode of the engine switch to the "OFF" position before connecting or disconnecting scan tool (M.U.T.-III).
Connect scan tool (M.U.T.-III) [Refer to "How to connect scan tool (M.U.T.-III) "].
(2) Turn the power supply mode of the engine switch to "ON".
(3) Diagnose the CAN bus line.
(4) Turn the power supply mode of the engine switch to "OFF".
Is the check result normal?
Go to Step 3.
Repair the CAN bus line (Refer to GROUP 54C, Diagnosis ).
 
STEP 3. Using scan tool (M.U.T.-III), communicates with this system.
Check that the communication with scan tool (M.U.T.-III) is possible.
noteIf ETACS-ECU is not active, KOS&OSS-ECU cannot communicate with the scan tool (M.U.T.-III).
(1)
cautionTo prevent damage to scan tool (M.U.T.-III), always turn the power supply mode of the engine switch to the "OFF" position before connecting or disconnecting scan tool (M.U.T.-III).
Connect scan tool (M.U.T.-III) [Refer to "How to connect scan tool (M.U.T.-III) "].
(2) Turn the power supply mode of the engine switch to "ON".
(3) Turn on and off any of the door switches several times, or open any of the doors.
(4) Check that KOS&OSS-ECU can communicate with the scan tool (M.U.T.-III).
(5) Turn the power supply mode of the engine switch to "OFF".
Is the check result normal?
Go to Step 4.
Carry out the troubleshooting of "KOS&OSS-ECU power supply or ground circuit malfunction" (Refer to ).
 
STEP 4. Using scan tool (M.U.T.-III), read the diagnostic trouble code.
Check if the diagnosis trouble code is set in the KOS&OSS-ECU.
(1)
cautionTo prevent damage to scan tool (M.U.T.-III), always turn the power supply mode of the engine switch to the "OFF" position before connecting or disconnecting scan tool (M.U.T.-III).
Connect scan tool (M.U.T.-III) [Refer to "How to connect scan tool (M.U.T.-III) "].
(2) Turn the power supply mode of the engine switch to "ON".
(3) Check if DTC is set.
(4) Turn the power supply mode of the engine switch to "OFF".
Is the DTC set?
Refer to diagnostic trouble code chart .
Go to Step 5.
 
STEP 5. Engine switch check.
Continuity check of engine switch (Refer to ).
Is the check result normal?
Go to Step 6.
Replace the engine switch.
 
STEP 6. Keyless operation key battery charged level check.
Check whether the LED illuminates when the lock/unlock switch on the keyless operation key is pressed.
Is the check result normal?
Go to Step 7.
Replace the battery in the keyless operation key
 
STEP 7. Customized contents check.
Use the customization function to check the setting contents of "F.A.S.T. feature" (Refer to ).
noteIf the customized contents do not satisfy your intention, customize the system again.
Which content is selected?
Set to "Both enable" or "ENG start enable" : Go to Step 8.
"DoorEntry enable" or "Both disable" : Go to Step 10.
 
STEP 8. Check of the troubles.
Check the condition of the keyless operation key or spare key when the vehicle power does not turn "ON".
What kinds of circumstances cause the vehicle power supply to remain off?
When the keyless operation key is inside the vehicle : Go to Step 9.
When the spare key or the keyless operation key (discharged battery) is inserted into the key box : Go to Step 10.
 
STEP 9. Keyless operation system communication test.
Check that the communication with the outside transmission antenna assembly is normal (Refer to Antenna Test ).
  • Front antenna (indoor)
  • Rear antenna (indoor)
OK: Normal values are displayed for all the items
Is the check result normal?
Go to Step 11.
Go to Step 10.
 
STEP 10. Check with another registered keyless operation key.
Check whether the power supply mode can be switched by another registered keyless operation key.
Can the power supply mode be switched?
It can be switched : Go to Step 12.
It cannot be switched : Go to Step 11.
There is no other registered keyless operation key : Go to Step 12.
 
STEP 11. Connection check of commercial electric products.
Check whether commercial electric products are connected.
Is commercial electric products connected?
Disconnect the commercial electric products as they may be interfering with communication. Then go to Step 14.
Go to Step 14.
 
STEP 12. Keyless operation key check.
Check whether the registered keyless operation key is used.
Is the registered keyless operation key used?
Used : Register the key ID and keyless operation key ID of the keyless operation key. Then go to Step 13.
Not used (The keyless operation key is not registered or the keyless operation key is also used for another vehicle) : Refer to the key ID registration procedure manual to register the key ID. If the key ID cannot be registered, replace the keyless operation key and register the key ID.
 
STEP 13. Check of the troubles.
Check that the vehicle power can be turned "ON".
Is the check result normal?
This diagnosis is complete.
Go to Step 14.
 
STEP 14. Check of the troubles.
Check that the vehicle power can be turned "ON".
Is the check result normal?
Aggravation of radio wave condition caused by commercial electric products or intermittent malfunction is suspected (Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).
Go to Step 15.
 
STEP 15. Check of the troubles.
Check that the vehicle power can be turned "ON" or the indicator of engine switch in orange, green.
Is the check result normal?
Go to Step 16.
Replace the KOS&OSS-ECU and register the VIN (Refer to ).
 
STEP 16. Using scan tool (M.U.T.-III), read the diagnostic trouble code.
Check if the diagnosis trouble code is set in the KOS&OSS-ECU.
(1)
cautionTo prevent damage to scan tool (M.U.T.-III), always turn the power supply mode of the engine switch to the "OFF" position before connecting or disconnecting scan tool (M.U.T.-III).
Connect scan tool (M.U.T.-III) [Refer to "How to connect scan tool (M.U.T.-III) "].
(2) Turn the power supply mode of the engine switch to "ON".
(3) Check if DTC is set.
(4) Turn the power supply mode of the engine switch to "OFF".
Is the DTC set?
Refer to diagnostic trouble code chart .
This diagnosis is complete.