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DTC B240E: RR antenna (indoor) open
 
 
cautionWhen replacing the ECU, always check that the communication circuit is normal.
 
 
DTC SET CONDITION
If an open or short to ground circuit is detected in the inside transmission antenna (rear), the DTC is set.
 
 
TECHNICAL DESCRIPTION (COMMENT)
An open circuit or short to ground is detected consecutively five times when radio waves are sent from the inside transmission antenna (rear).
 
 
TROUBLESHOOTING HINTS
  • Malfunction of the inside transmission antenna assembly (rear)
  • Malfunction of the KOS&OSS-ECU
  • Damaged wiring harness and connectors
 
 
DIAGNOSIS
STEP 1. Check of short to power supply, short to ground, and open circuit in INRP, INRG line between the inside transmission antenna assembly (rear) connector and the KOS&OSS-ECU connector.
Is the check result normal?
Go to Step 2.
Repair the connector(s) or wiring harness.
 
STEP 2. Keyless operation system communication test.
Check that the communication with the inside transmission antenna assembly (rear) is normal (Refer to Antenna Test ).
  • Rear antenna (indoor)
OK: Normal is displayed.
Is the check result normal?
Go to Step 3.
Replace the inside transmission antenna assembly (rear).
 
STEP 3. Check whether the diagnostic trouble code is set again.
(1) Erase the diagnostic trouble code.
(2) Turn the power supply mode of the engine switch to "OFF".
(3) Close all the doors and press the driver's door lock/unlock switch to lock and unlock the door several times.
(4) Check if the diagnostic trouble code is set.
Is the DTC set?
Replace KOS&OSS-ECU and register the ID codes (Refer to ).
Intermittent malfunction is suspected (Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Deal with Intermittent Malfunction ).