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DTC B240D: Front antenna(indoor) open
 
 
cautionWhen replacing the ECU, always check that the communication circuit is normal.
 
 
 
 
DTC SET CONDITION
If an open circuit is detected in the inside transmission antenna (front), 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 inside transmission antenna assembly (front)
  • Malfunction of the KOS-ECU
  • Damaged wiring harness and connectors
 
 
DIAGNOSIS
STEP 1. Check KOS-ECU connector C-08 and inside transmission antenna assembly (front) connector C-19 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Are KOS-ECU connector C-08 and inside transmission antenna assembly (front) connector C-19 in good condition?
Go to Step 2.
Repair or replace the damaged component(s). Refer to GROUP 00E, Harness Connector Inspection . Check that the inside transmission antenna assembly (front) works normally.
 
STEP 2. Check the wiring harness between KOS-ECU connector C-08 (terminal Nos. 31, 43) and inside transmission antenna assembly (front) connector C-19 (terminal Nos. 1, 5).
  • Check the communication, power supply, and ground wires for open circuit.
Are the wiring harness between KOS-ECU connector C-08 (terminal Nos. 31, 43) and inside transmission antenna assembly (front) connector C-19 (terminal Nos. 1, 5) in good condition?
Go to Step 3.
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 inside transmission antenna assembly (front) works normally.
 
STEP 3. Keyless operation system communication test
Check that the communication with the inside transmission antenna assembly (front) is normal (Refer to Antenna Test ).
Antennas to be checked
  • front antenna (interior)
OK: Normal is displayed.
Is the check result normal?
Go to Step 4.
Replace the inside transmission antenna assembly (front).
 
STEP 4. Check whether the diagnostic trouble code is reset.
(1) Erase the DTC.
(2) Turn the power supply mode of the engine switch from OFF to ON.
(3) Check if the DTC is set.
Is the DTC set?
Replace KOS-ECU and register the ID codes (Refer to ).
The procedure is complete.