When replacing the ECU, always
check that the communication circuit is normal.
DIAGNOSTIC FUNCTION
If an open circuit is detected in the inside transmission antenna (front), the diagnosis
code is set.
JUDGMENT CRITERIA
While the engine switch is turned to the OFF position, the system has detected an open
circuit in the antenna.
PROBABLE CAUSES
Malfunction of the inside transmission antenna assembly (front)
Malfunction of the KOS-ECU
Damaged wiring harness and connectors
DIAGNOSIS PROCEDURE
STEP 1. Check of short to power supply, short to earth,
and open circuit in INFP, INFG line between the inside transmission antenna assembly (front) connector
and the KOS-ECU connector.
Q.
Is the check result normal?
Go to Step 2
Repair the connectors or wiring harness.
STEP 2. Keyless operation system communication test
Check that the communication with the inside transmission antenna assembly (front) is
normal (Refer to Antenna Test ). Antennas to be checked
Front antenna (indoor)
OK: Normal is displayed.
Q.
Is the check result normal?
Go to Step 3
Replace the inside transmission antenna assembly (front).
STEP 3. Check whether the diagnosis code is reset.
(1)Erase the diagnosis code.
(2)Turn the power supply mode of the engine switch from OFF to ON.
(3)Check if the diagnosis code is set.
(4)Turn the power supply mode of the engine switch from OFF to ON.
Q.
Is the diagnosis code set?
Replace KOS-ECU and register the ID codes (Refer to ).
Intermittent malfunction is suspected (Refer to GROUP 00 - How to Use Troubleshooting/Inspection
Service Points - How to Deal with Intermittent Malfunction ).