Wireless Control Module (WCM)

DTC B2415: RA module power voltage

CAUTION:

- If DTC B2415 is set, diagnose the CAN bus lines.
- When replacing the ECU, always check that the communication circuit is normal.














DTC SET CONDITION

If an open circuit or short to ground occurs in the receiver antenna assembly, WCM sets DTC B2415.

TECHNICAL DESCRIPTION (COMMENT)

The receiver antenna assembly receives the transmitter signal. The receiver antenna assembly transmits the received signal to the WCM. If an open circuit or short to ground occurs on the wiring harness between WCM and receiver antenna assembly at this time, WCM determines that there is a problem.

TROUBLESHOOTING HINTS

- Malfunction of CAN bus line
- Malfunction of the receiver antenna assembly
- Malfunction of the WCM
- Damaged wiring harness and connectors

DIAGNOSIS

Required Special Tools:

- 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, diagnose the CAN bus line.





(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 to the data link connector.
(2)Turn the ignition switch to the "ON" position.
(3)Diagnose the CAN bus line.
(4)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the CAN bus line found to be normal?

YES Go to Step 2.

NO Repair the CAN bus line CAN Bus Diagnostics Chart).

STEP 2. Check receiver antenna assembly connector D-14 and WCM connector C-07 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q. Is the receiver antenna assembly connector D-14 and WCM connector C-07 in good condition?

YES Go to Step 3.
NO Repair the defective connector.
STEP 3. Check the wiring harness between the receiver antenna assembly connector D-14 (terminal Nos. 8, 12) and the WCM connector C-07 (terminal Nos. 8, 12) for open circuit.

(1)Disconnect receiver antenna assembly connector D-14 and WCM connector C-07, and check the wiring harness.





(2)Check the wiring harness between receiver antenna assembly connector D-14 (terminal No.8) and WCM connector C-07 (terminal No.8).
OK: Continuity exists (2ohms or less)






(3)Check the wiring harness between receiver antenna assembly connector D-14 (terminal No.12) and WCM connector C-07 (terminal No.12).
OK: Continuity exists (2ohms or less)

Q. Is the wiring harness between receiver antenna assembly connector D-14 (terminal Nos. 8, 12) and the WCM connector C-07 (terminal Nos. 8, 12) in good condition?

YES : Go to Step 4.

NO (receiver antenna assembly connector D-14 terminal No.8 - WCM connector C-07 terminal No.8.) : Repair the wiring harness between receiver antenna assembly connector D-14 (terminal No.8) and WCM connector C-07 (terminal No.8).

NO (receiver antenna assembly connector D-14 terminal No.12 - WCM connector C-07 terminal No.12.) : Repair the wiring harness between receiver antenna assembly connector D-14 (terminal No.12) and WCM connector C-07 (terminal No.12).

STEP 4. Check the wiring harness between the receiver antenna assembly connector D-14 (terminal Nos. 8, 12) and the ground for short circuit.

(1)Disconnect receiver antenna assembly connector D-14 and WCM connector C-07, and check the wiring harness.





(2)Check the wiring harness between receiver antenna assembly connector D-14 (terminal No.8) and ground.
OK: No continuity






(3)Check the wiring harness between receiver antenna assembly connector D-14 (terminal No.12) and ground.
OK: No continuity

Q. Is the wiring harness between receiver antenna assembly connector D-14 (terminal Nos. 8, 12) and the ground in good condition?

YES : Go to Step 5.

NO (receiver antenna assembly connector D-14 terminal No.8 - ground.) : Repair the wiring harness between receiver antenna assembly connector D-14 (terminal No.8) and the ground.

NO (receiver antenna assembly connector D-14 terminal No.12 - ground.) : Repair the wiring harness between receiver antenna assembly connector D-14 (terminal No.12) and the ground.

STEP 5. Replace the receiver antenna assembly, and 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 WCM and register the ID codes (Refer to ID registration procedure manual - ID codes registration judgement table).
NO The procedure is complete.