B2412
DTC B2412: LF antenna power voltageCAUTION:
- If DTC No. B2412 is set, diagnose the CAN buslines.
- When replacing the ECU, always check that the communication circuit is normal.
Transmission Antenna Assembly Circuit (Part 1):
Transmission Antenna Assembly Circuit (Part 2):
Transmission Antenna Assembly Circuit (Part 3):
Transmission Antenna Assembly Circuit (Part 4):
Transmission Antenna Assembly Circuit (Part 5):
Transmission Antenna Assembly Circuit (Part 6):
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
- Damaged wiring harness and connectors
- Malfunction of the KOS-ECU
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.
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.
1. Connect scan tool MB991958. Refer to "How to connect scan tool (M.U.T.-III)." How To Connect The 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?
YES: Diagnose the KOS-ECU. (Refer to Diagnostic Trouble Code Chart). Diagnostic Trouble Code Descriptions
NO: Go to Step 2.
STEP 2. Check KOS-ECU connector C-05 for loose,corroded or damaged terminals, or terminals pushed beck in the connector.
Q: Is KOS-ECU connector C-05 in good condition?
YES: Go to Step 3.
NO: Repair or replace the damaged component(s). Refer to general (Electrical), Harness Connector Inspection. Check that the inside and outside antenna works normally.
STEP 3. Check the wiring harness between the KOS-ECU connector C-05 (terminal No. 40) and each inside and outside antenna for open circuit.
1. Disconnect KOS-ECU connector C-05 and each inside and outside antenna, and check the wiring harness.
2. Wiring harness between KOS-ECU connector C-05 (terminal No. 40) and outside transmitter antenna assembly (driver's side) D-23 connector (terminal No. 1)
OK: Continuity exists (2 Ohms or less)
3. 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)
4. Wiring harness between KOS-ECU connector C-05 (terminal No. 40) and inside transmitter antenna (front) connector C-121 (terminal No. 1)
OK: Continuity exists (2 Ohms or less)
5. Wiring harness between KOS-ECU connector C-05 (terminal No. 40) and inside transmitter antenna (rear) connector F-02 (terminal No. 1)
OK: Continuity exists (2 Ohms or less)
6. Wiring harness between KOS-ECU connector C-05 (terminal No. 40) and outside transmitter antenna assembly (trunk lid) connector F-20 (terminal No. 3)
OK: Continuity exists (2 Ohms or less)
Q: Is the wiring harness between KOS-ECU connector C-05 (terminal No. 40) and each inside and outside antenna in good condition?
YES: Go to Step 4.
NO (KOS-ECU connector C-05 terminal No.40 - outside transmitter antenna assembly (driver's side) connector D-23 terminal No.1.): Repair the wiring harness between KOS-ECU connector C-05 (terminal No.40) and outside transmitter antenna assembly (driver's side) connector D-23 (terminal No.1).
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).
NO (KOS-ECU connector C-05 terminal No.40 - inside transmitter antenna assembly (front) connector C-121 terminal No.1.): Repair the wiring harness between KOS-ECU connector C-05 (terminal No.40) and outside transmitter antenna assembly (front) connector C-121 (terminal No.1).
NO (KOS-ECU connector C-05 terminal No.40 - inside transmitter antenna assembly (rear) connector F-02 terminal No.1.): Repair the wiring harness between KOS-ECU connector C-05 (terminal No.40) and outside transmitter antenna assembly (rear) connector F-02 (terminal No.1).
NO (KOS-ECU connector C-05 terminal No.40 - outside transmitter antenna assembly (trunk lid) connector F-20 terminal No.3.): Repair the wiring harness between KOS-ECU connector C-05 (terminal No.40) and outside transmitter antenna assembly (trunk lid) connector F-20 (terminal No.3).
STEP 4. Check the wiring harness between the each inside and outside antenna and the ground for short circuit.
1. Disconnect each inside and outside antenna, and check the wiring harness.
2. Check the wiring harness between outside transmitter antenna assembly (driver's side) connector D-23 (terminal No.1) and ground
OK: No continuity
3. Check the wiring harness between outside transmitter antenna assembly (passenger's side) connector D-42 (terminal No.1) and ground
OK: No continuity
4. Check the wiring harness between inside transmitter antenna assembly (front) connector C-121 (terminal No.1) and ground
OK: No continuity
5. Check the wiring harness between inside transmitter antenna assembly (rear) connector F-02 (terminal No.1) and ground
OK: No continuity
6. Check the wiring harness between outside transmitter antenna assembly (trunk lid) connector F-20 (terminal No.3) and ground
OK: No continuity
Q: Is the wiring harness between each inside and outside antenna and the ground in good condition?
YES: Go to Step 5.
NO [outside transmitter antenna assembly (driver's side) connector D-23 terminal No.1 - ground.]: Repair the wiring harness between outside transmitter antenna assembly (driver's side) connector D-23 (terminal No.1) 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.
NO [inside transmitter antenna assembly (front) connector C-121 terminal No.1 - ground.]: Repair the wiring harness between inside transmitter antenna assembly (front) connector C-121 (terminal No.1) and the ground.
NO [inside transmitter antenna assembly (rear) connector F-02 terminal No.1 - ground.]: Repair the wiring harness between inside transmitter antenna assembly (rear) connector F-02 (terminal No.1) and the ground.
NO [outside transmitter antenna assembly (trunk lid) connector F-20 terminal No.3 - ground.]: Repair the wiring harness between outside transmitter antenna assembly (trunk lid) connector F-20 (terminal No.3) and the ground.
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 diagnosis is complete.