B240A

DTC B240A: FR antenna (outdoor) open

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

Outside Transmission Antenna Assembly (Driver's Side) Circuit (Part 1):

Outside Transmission Antenna Assembly (Driver's Side) Circuit (Part 2):

DTC SET CONDITION
If an open circuit is detected in the outside transmitter 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 transmitter antenna assembly (driver's side)
- Malfunction of the KOS-ECU
- Damaged wiring harness and connectors

DIAGNOSIS

STEP 1. Check KOS-ECU connector C-31 and outside transmitter antenna assembly (driver's side) connector D-19 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Are KOS-ECU connector C-31 and outside transmitter antenna assembly (driver's side) connector D-19 in good condition?

YES : Go to Step 2.

NO : Repair or replace the damaged component(s). Refer to general (electrical), Harness Connector Inspection. Check that the outside transmitter antenna assembly (driver's side) works normally.

STEP 2. Check the wiring harness between KOS-ECU connector C-31 (terminal Nos. 6, 17, 40) and outside transmitter antenna assembly (driver's side) connector D-19 (terminal Nos. 3, 2, 1) and ground.

NOTE: Also check intermediate connectors C-21, C-36 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connectors C-21, C-36 is damaged, repair or replace the damaged component(s) as described in general(electrical), Harness Connector Inspection.

Q: Are the wiring harness between KOS-ECU connector C-31 (terminal Nos. 6, 17, 40) and outside transmitter antenna assembly (driver's side) connector D-19 (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 transmitter antenna assembly (driver's side) works normally.

STEP 3. Keyless operation system communication test

Check that the communication with the outside transmitter 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?

YES : Go to Step 4.

NO : Replace the outside transmitter 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.

NO : Intermittent malfunction is suspected (Refer to general (Body and Chassis) How to Use Troubleshooting/Inspection Service Points - How to Deal with Intermittent Malfunction).