B240A

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?

YES Go to Step 2.
NO Repair or replace the damaged component(s). 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 Harness Connector Inspection 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?

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. 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 Testing and Inspection).

Antennas to be checked

- Driver side antenna (exterior)

OK: Normal is displayed.


Q. Is the check result normal?

YES Go to Step 4.
NO 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?

YES Replace KOS-ECU and register the ID codes (Refer to ID registration procedure manual - ID codes registration judgement table).
NO Intermittent malfunction is suspected How to Cope With Intermittent Malfunctions).