When replacing the ECU, always check that the communication
circuit is normal.
DIAGNOSTIC FUNCTION
If an open circuit is detected in the interior transmitter antenna (rear: LH), the diagnosis
code is set.
JUDGEMENT CRITERIA
When the ignition push switch is pressed, or when the antenna open circuit detection request
is received from the diagnosis function, the failure is detected.
PROBABLE CAUSES
Malfunction of Interior transmitter antenna assembly (rear: LH)
STEP 2. Check the wiring harness between the D-112 interior transmitter
antenna assembly (rear: LH) connector terminal Nos. 1, 2, 3 and the C-104 KOS-ECU connector
terminal Nos. 40, 15, 6.
Check the communication, power supply, and earth wires for open circuit.
note
Prior to the wiring harness inspection, check intermediate connector C-22, and repair
if necessary.
Q.
Is the check result normal?
Go to Step 3.
Repair the wiring harness.
STEP 3. Keyless operation system communication test
Check that the communication with the interior transmitter antenna assembly (rear: LH)
is normal (Refer to Antenna Test ). Antennas to be checked
Rear left side antenna (interior)
OK: Normal is displayed.
Q.
Is the check result normal?
Go to Step 4.
Replace the Interior transmitter antenna assembly (rear: LH).
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 ).
Intermittent malfunction is suspected (Refer to GROUP 00 -
How to Use Troubleshooting/Inspection
Service Points -
How to Deal with Intermittent Malfunction ).
)
)
)
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)
)
Go to Step 2.
Repair the defective connector.
).