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DTC B2412: Antenna power voltage


caution
  • If DTC No. B2412 is set, diagnose the CAN bus lines.
  • When replacing the ECU, always check that the communication circuit is normal.












DTC SET CONDITION


If KOS-ECU detects an abnormality in power supply of the outside or inside antennas, KOS-ECU sets the DTC No. B2412.

TECHNICAL DESCRIPTION (COMMENT)


If an abnormality in power supply of the outside or inside transmitter antenna is detected when power supply of it is turned on, KOS-ECU determines that there is a problem.

TROUBLESHOOTING HINTS



DIAGNOSIS
Required Special Tools:
  • MB992006: Extra fine probe
  • MB991223: Harness set
  • MB991958: Scan Tool (M.U.T.-III Sub Assembly)

    • MB991824: Vehicles Communication Interface (V.C.I.)
    • MB991827: M.U.T.-III USB Cable
    • MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, read the diagnostic trouble code.

(1)
caution To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
Connect scan tool MB991958. Refer to "How to connect scan tool (M.U.T.-III) ."
(2)Turn the ignition switch to the "ON" position.
(3)Check whether the KOS-ECU related DTC is set.
(4)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the DTC set?

Diagnose the KOS-ECU. Refer to .

Go to Step 2.

STEP 2. Check KOS-ECU connector C-31 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q. Is KOS-ECU connector C-31 in good condition?
Go to Step 3.
Repair or replace the damaged component(s). Refer to GROUP 00E, Harness Connector Inspection . Check that the inside and outside antenna works normally.

STEP 3. Check the wiring harness between KOS-ECU connector C-31 and each inside and outside antenna.

  • Wiring harness between KOS-ECU connector C-31 (terminal No. 40) and outside transmitter antenna assembly (driver’s side) D-19 connector (terminal No. 1)
  • Wiring harness between KOS-ECU connector C-31 (terminal No. 40) and outside transmitter antenna assembly (passenger’s side) connector D-38 (terminal No. 1)
  • Wiring harness between KOS-ECU connector C-31 (terminal No. 40) and inside transmitter antenna (front) connector C-116 (terminal No. 1)
  • Wiring harness between KOS-ECU connector C-31 (terminal No. 40) and inside transmitter antenna (rear) connector F-03 (terminal No. 1)
  • Wiring harness between KOS-ECU connector C-31 (terminal No. 40) and outside transmitter antenna assembly (trunk lid) connector F-16 (terminal No. 3)
note Also check intermediate connector C-21, C-36, D-11 <inside transmission antenna assembly (rear)>, D-14 <outside transmission assembly (turnk lid)> for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-21, C-36, D-11 <inside transmission antenna assembly (rear)>, D-14 <outside transmission assembly (turnk lid)> is damaged, repair or replace the damaged component(s) as described in GROUP 00E, Harness Connector Inspection .

Q. Is the check result normal?
Go to Step 4.
Repair the wiring harness.

STEP 4. 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?
Replace KOS-ECU and register the ID codes (Refer to ).
The diagnosis is complete.