If the diagnosis
code No. B2412 is set, diagnose the CAN bus lines.
When replacing the ECU, always check that the communication circuit is normal.
DIAGNOSTIC FUNCTION
If KOS-ECU detects an abnormality in power supply of the outside or inside antennas, KOS-ECU
sets the diagnosis code No. B2412.
JUDGEMENT CRITERIA
If an abnormality in power supply of the outside or inside transmitter antenna is detected
when power supply of it is turned on, KOS-ECU determines that there is a problem.
PROBABLE CAUSES
Damaged wiring harness and connectors
Malfunction of the KOS-ECU
DIAGNOSTIC PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.
Q.
Is the check result normal?
Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54C -
Troubleshooting ).
On completion, go to Step 2.
STEP 2. Connector check: C-104 KOS-ECU connector
Q.
Is the check result normal?
Go to Step 3.
Repair the defective connector.
STEP 3. Check the wiring harness between KOS-ECU and each inside and outside antenna.
Check the following wiring harnesses for open circuit and short to earth.
Wiring harness between C-104 KOS-ECU connector terminal No. 40 and D-123 inside transmitter
antenna (front) connector terminal No. 1
Wiring harness between C-104 KOS-ECU connector terminal No. 40 and D-106 inside transmitter
antenna (rear: RH) connector terminal No. 1
Wiring harness between C-104 KOS-ECU connector terminal No. 40 and D-112 inside transmitter
antenna (rear: LH) connector terminal No. 1
Wiring harness between C-104 KOS-ECU connector terminal No. 40 and F-17 outside transmitter
antenna assembly (tailgate) connector terminal No. 3
note
Before the wiring harness inspection, inspect C-22 and F-22 <the outside transmitter
antenna (tailgate)>
intermediate connectors, and repair them if necessary.
Q.
Is the check result normal?
Go to Step 4.
Repair the wiring harness.
STEP 4. Check whether the diagnosis code is reset.
(1)Erase the diagnosis code.
(2)Turn the ignition 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 KOS-ECU and register the ID codes (Refer to ).
)
)
)
)
)
)
)
)
)
Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54C -
Troubleshooting 
).
On completion, go to Step 2.