B240A

DTC B240A DR side antenna(outdoor) open

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


















DIAGNOSTIC FUNCTION

If an open circuit is detected in the outside transmission antenna assembly (driver'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 the outside transmission antenna assembly (driver's side)

- Malfunction of the KOS-ECU

- Damaged wiring harness and connectors

DIAGNOSTIC PROCEDURE

STEP 1. Check KOS-ECU connector C-102 and outside transmission antenna assembly (driver's side) connector D-131 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q. Are KOS-ECU connector C-102 and outside transmission antenna assembly (driver's side) connector D-131 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, 17 and 40) and outside transmission antenna assembly (driver's side) connector D-131
(terminal Nos. 3, 2 and 1).

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

NOTE:
Also check intermediate connectors C-22 and C-32 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connectors C-22 and C-32 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, 17 and 40) and outside transmission antenna assembly (driver's side) connector D-131 (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 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 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).