B240E

DTC B240E RR antenna(indoor) open

CAUTION:
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 assembly (rear: passenger's side), the diagnostic trouble code is set.

JUDGMENT 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 inside transmission antenna assembly (rear: passenger's side)

- Malfunction of the KOS-ECU

- Damaged wiring harness and connectors

DIAGNOSTIC PROCEDURE

STEP 1. Check KOS-ECU connector C-102 and inside transmission antenna assembly (rear: passenger's side) connector D-106 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q. Are KOS-ECU connector C-102 and inside transmission antenna assembly (rear: passenger's side) connector D-106 in good condition?

YES Go to Step 2.
NO Repair or replace the damaged component(s). Harness Connector Inspection.
STEP 2. Check the wiring harness between KOS-ECU connector C-102 (terminal Nos. 6, 20 and 40) and inside transmission antenna assembly (rear: passenger's side) connector D-106 (terminal Nos. 3, 2 and 1).

- Check the communication, power supply, and ground wires for open circuit.

NOTE:
Also check intermediate connector C-22 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connectors C-22 is damaged, repair or replace the damaged component(s) as described in Harness Connector Inspection Harness Connector Inspection.

Q. Is the wiring harness between KOS-ECU connector C-102 (terminal Nos. 6, 20 and 40) and inside transmission antenna assembly (rear: passenger's side) connector D-106 (terminal Nos. 3, 2 and 1) in good condition?

YES Go to Step 3.
NO The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary.
STEP 3. Keyless operation system communication test

Check that the communication with the inside transmission antenna assembly (rear: passenger's side) is normal (Refer to Antenna Test Testing and Inspection).

Antennas to be checked

Rear front passenger's side antenna (interior)

OK: Normal is displayed.


Q. Is the check result normal?

YES Go to Step 4.
NO Replace the inside transmission antenna assembly (rear: passenger's side).
STEP 4. Check whether the diagnostic trouble code is reset.

(1)Erase the diagnostic trouble code.

(2)Turn the ignition switch from the LOCK (OFF) position to the ON position.

(3)Check if the diagnostic trouble code is set.

Q. Is the diagnostic trouble code set?

YES Replace KOS-ECU and register the ID codes (Refer to ID Codes Registration Procedure).
NO Intermittent malfunction is suspected How to Cope With Intermittent Malfunctions).