B240D

DTC B240D Front antenna(indoor) open

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

Inside Transmission Antenna Assembly (Front) Circuit:

DIAGNOSTIC FUNCTION
If an open circuit is detected in the interior transmitter antenna (front), the diagnostic trouble code is set.

JUDGEMENT 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 interior transmitter antenna assembly (front)
- Malfunction of the KOS-ECU
- Damaged wiring harness and connectors

DIAGNOSTIC PROCEDURE

STEP 1. Check KOS-ECU connector C-102 and interior transmitter antenna assembly (front) connector D-124 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Are KOS-ECU connector C-102 and interior transmitter antenna assembly (front) connector D-124 in good condition?

YES : Go to Step 2.

NO : Repair or replace the damaged component(s). Refer to General (Electrical), Harness Connector Inspection.

STEP 2. Check the wiring harness between KOS-ECU connector C-102 (terminal Nos. 6, 16 and 40) and interior transmitter antenna assembly (front) connector D-124 (terminal Nos. 3, 2 and 1).

NOTE: Also check intermediate connector C-22 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connectors C-22 is damaged, repair or replace the damaged component(s) as described in General (Electrical), Harness Connector Inspection.

Q: Is the wiring harness between KOS-ECU connector C-102 (terminal Nos. 6, 18 and 40) and interior transmitter antenna assembly (front) connector D-124 (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 interior transmitter antenna assembly (front) is normal. Antenna Communication Test

Antennas to be checked
Driver's side antenna (interior)

OK: Normal is displayed.

Q: Is the check result normal?

YES : Go to Step 4.

NO : Replace the interior transmitter antenna assembly (front).

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.

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