DTC B240D: Front antenna(indoor) open

caution

When replacing the ECU, always check that the communication circuit is normal.

DTC SET CONDITION

If an open circuit is detected in the inside transmission antenna (front), the DTC is set.

TECHNICAL DESCRIPTION (COMMENT)

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.

TROUBLESHOOTING HINTS

Malfunction of the inside transmission antenna assembly (front)
Malfunction of the KOS-ECU
Damaged wiring harness and connectors

DIAGNOSIS

STEP 1. Check KOS-ECU connector C-05 and inside transmission antenna assembly (front) connector C-121 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q. Are KOS-ECU connector C-05 and inside transmission antenna assembly (front) connector C-121 in good condition?

	Go to Step 2.

	Repair or replace the damaged component(s). Refer to GROUP 00E, Harness Connector Inspection . Check that the inside transmission antenna assembly (front) works normally.

STEP 2. Check the wiring harness between KOS-ECU connector C-05 (terminal Nos. 6, 16, 40) and inside transmission antenna assembly (front) connector C-121 (terminal Nos. 3, 2, 1).

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

note

Also check intermediate connector C-23 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-23 is damaged, repair or replace the damaged component(s) as described in GROUP 00E, Harness Connector Inspection

Q. Are the wiring harness between KOS-ECU connector C-05 (terminal Nos. 6, 16, 40) and inside transmission antenna assembly (front) connector C-121 (terminal Nos. 3, 2, 1) in good condition?

	Go to Step 3.

	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. Check that the inside transmission antenna assembly (front) works normally.

STEP 3. 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 (interior)

OK: Normal is displayed.

Q. Is the check result normal?

	Go to Step 4.

	Replace the inside transmission antenna assembly (front).

STEP 4. Check whether the diagnostic trouble code is reset.

(1)Erase the DTC.

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

(3)Check if the DTC is set.

Q. Is the DTC set?

	Replace KOS-ECU and register the ID codes (Refer to ).

	The procedure is complete.