DTC B240A: DR side antenna(outdoor) 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 outside transmission antenna (driver’s side), 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 outside transmission antenna assembly (driver’s side)
Malfunction of the KOS-ECU
Damaged wiring harness and connectors

DIAGNOSIS

STEP 1. Check KOS-ECU connector C-05 and outside transmission antenna assembly (driver’s side) connector D-23 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q. Are KOS-ECU connector C-05 and outside transmission antenna assembly (driver’s side) connector D-23 in good condition?

	Go to Step 2.

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

STEP 2. Check the wiring harness between KOS-ECU connector C-05 (terminal Nos. 6, 17, 40) and outside transmission antenna assembly (driver’s side) connector D-23 (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, 17, 40) and outside transmission antenna assembly (driver’s side) connector D-23 (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 outside transmission antenna assembly (driver’s side) works normally.

STEP 3. Keyless operation system communication test

Check that the communication with the outside transmission antenna assembly (driver’s side) is normal (Refer to Antenna Test

Antennas to be checked

Driver side antenna (exterior)

OK: Normal is displayed.

Q. Is the check result normal?

	Go to Step 4.

	Replace the outside transmission antenna assembly (driver’s side).

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 ).

	Intermittent malfunction is suspected (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Deal with Intermittent Malfunction ).