DTC B223D: OCM (Occupant Classification-ECU) DTC Present

caution

If DTC B223D is set in the SRS-ECU, always diagnose the CAN main bus line.

DTC SET CONDITION

It is set if a DTC occurs in the occupant classification-ECU.

TROUBLESHOOTING HINTS

Malfunction of the SRS-ECU
Malfunction of the occupant classification-ECU

DIAGNOSIS

Required Special Tool:

MB991958 Scan Tool (M.U.T.-III Sub Assembly)

MB991824: Vehicle Communication Interface (V.C.I.)
MB991827 M.U.T.-III USB Cable
MB991910 M.U.T.-III Main Harness A (Vehicles with CAN communication system)

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. Refer to "How to connect the scan tool

."
(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?

Go to Step 2.

Repair the CAN bus line (Refer to GROUP 54C, Diagnosis

STEP 2. Recheck for diagnostic trouble code.

Check that the DTC is set in the occupant classification-ECU.

Q. Is the DTC set?

	Diagnose the occupant classification-ECU (Refer to ). Then go to Step 3.

	Go to Step 3

STEP 3. Recheck for diagnostic trouble code.

Check again if the DTC is set to the SRS-ECU.

(1)Erase the DTC.

(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.

(3)Check if DTC is set.

(4)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the DTC set?

	Replace the SRS-ECU (Refer to ).

	There is an intermittent malfunction such as poor engaged connector(s) or open circuit (Refer to GROUP 00, How to use Troubleshooting/inspection Service Points ).