B240B

DTC B240B: FL antenna (outdoor) open

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

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

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

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

DIAGNOSIS

STEP 1. Check KOS-ECU connector C-05 and outside transmitter antenna assembly (passenger's side) connector D-42 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Are KOS-ECU connector C-05 and outside transmitter antenna assembly (passenger's side) connector D-42 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 (passenger's side) works normally.

STEP 2. Check the wiring harness between the KOS-ECU connector C-05 (terminal Nos. 6, 18, 40) and outside transmitter antenna assembly (passenger's side) connector D-42 (terminal Nos. 3, 2, 1) for open circuit.

1. Disconnect KOS-ECU connector C-05 and outside transmitter antenna assembly (passenger's side) connector D-42, and check the wiring harness.




2. Check the wiring harness between KOS-ECU connector C-05 (terminal No.6) and outside transmitter antenna assembly (passenger's side) connector D-42 (terminal No.3).

OK: Continuity exists (2 Ohms or less)




3. Check the wiring harness between KOS-ECU connector C-05 (terminal No.18) and outside transmitter antenna assembly (passenger's side) connector D-42 (terminal No.2).

OK: Continuity exists (2 Ohms or less)




4. Check the wiring harness between KOS-ECU connector C-05 (terminal No.40) and outside transmitter antenna assembly (passenger's side) connector D-42 (terminal No.1).

OK: Continuity exists (2 Ohms or less)

Q: Is the wiring harness between KOS-ECU connector C-05 (terminal Nos. 6, 18, 40) and outside transmitter antenna assembly (passenger's side) connector D-42 (terminal No.s. 3, 2, 1) in good condition?

YES: Go to Step 3.

NO (KOS-ECU connector C-05 terminal No.6 - outside transmitter antenna assembly (passenger's side) connector D-42 terminal No.3.): Repair the wiring harness between KOS-ECU connector C-05 (terminal No.6) and outside transmitter antenna assembly (passenger's side) connector D-42 (terminal No.3).

NO (KOS-ECU connector C-05 terminal No.18 - outside transmitter antenna assembly (passenger's side) connector D-42 terminal No.2.): Repair the wiring harness between KOS-ECU connector C-05 (terminal No.18) and outside transmitter antenna assembly (passenger's side) connector D-42 (terminal No.2).

NO (KOS-ECU connector C-05 terminal No.40 - outside transmitter antenna assembly (passenger's side) connector D-42 terminal No.1.): Repair the wiring harness between KOS-ECU connector C-05 (terminal No.40) and outside transmitter antenna assembly (passenger's side) connector D-42 (terminal No.1).

STEP 3. Check the wiring harness between the outside transmitter antenna assembly (passenger's side) connector D-42 (terminal Nos. 3, 2, 1) and the ground for short circuit.

1. Disconnect outside transmitter antenna assembly (passenger's side) connector D-42, and check the wiring harness.




2. Check the wiring harness between outside transmitter antenna assembly (passenger's side) connector D-42 (terminal No.3) and ground

OK: No continuity




3. Check the wiring harness between outside transmitter antenna assembly (passenger's side) connector D-42 (terminal No.2) and ground

OK: No continuity




4. Check the wiring harness between outside transmitter antenna assembly (passenger's side) connector D-42 (terminal No.1) and ground

OK: No continuity

Q: Is the wiring harness between outside transmitter antenna assembly (passenger's side) connector D-42 (terminal Nos. 3, 2, 1) and the ground in good condition?

YES: Go to Step 4.

NO [outside transmitter antenna assembly (passenger's side) connector D-42 terminal No.3 - ground.]: Repair the wiring harness between outside transmitter antenna assembly (passenger's side) connector D-42 (terminal No.3) and ground.

NO [outside transmitter antenna assembly (passenger's side) connector D-42 terminal No.2 - ground.]: Repair the wiring harness between outside transmitter antenna assembly (passenger's side) connector D-42 (terminal No.2) and the ground.

NO [outside transmitter antenna assembly (passenger's side) connector D-42 terminal No.1 - ground.]: Repair the wiring harness between outside transmitter antenna assembly (passenger's side) connector D-42 (terminal No.1) and the ground.

STEP 4. Keyless operation system communication test

Check that the communication with the outside transmitter antenna assembly (passenger's side) is normal (Refer to Antenna Test).

Antennas to be checked
- Passenger side antenna (exterior)

OK: Normal is displayed.

Q: Is the check result normal?

YES: Go to Step 5.

NO: Replace the outside transmitter antenna assembly (passenger's side).

STEP 5. 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 Code Registration Necessity Judgment Table)

NO: The procedure is complete.