Code No.B222C Coding Not Completed

caution

If diagnosis code No. B222C is set in the A/C-ECU, always diagnose the CAN bus lines.

caution

Before replacing the ECU, ensure that the communication circuit is normal.

TROUBLE JUDGMENT

The A/C-ECU receives vehicle information-related signals from the ETACS-ECU via the CAN bus lines. If the ECU receives an incorrect global coding data or cannot receive any coding data when the ignition switch is turned on and the coding is complete, diagnosis code B222C will be set.

PROBABLE CAUSES

Damaged the wiring harness or connectors
Malfunction of the ETACS-ECU
Malfunction of the A/C-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics

Use the M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?

	Go to Step 2

	Repair the CAN bus lines. (Refer to GROUP 54C - Troubleshooting ). On completion, go to Step 6.

STEP 2. M.U.T.-III other system diagnosis code

Check whether the ETACS-related diagnosis code is set.

Q. Is the diagnosis code set?

	Diagnose the ETACS-ECU. Refer to

	Go to Step 3

STEP 3. M.U.T.-III other system diagnosis code

Check if a diagnosis code, which relates to the CAN communication-linked systems below, is set.

WCM <Vehicles with WCM>
B2204: Coding data unmatched
KOS <Vehicles with KOS>
B2204: Coding data unmatched

Q. Is the diagnosis code set?

	Go to Step 4

	Go to Step 5

STEP 4. Check whether the diagnosis code is reset.

Recheck if the diagnosis code is set.

(1)Erase the diagnosis code.

(2)Ignition switch: LOCK (OFF) to ON

(3)Check if the diagnosis code is set.

Q. Is the diagnosis code set?

	Replace the ETACS-ECU, and then go to Step 6.

	A poor connection, open circuit or other intermittent malfunction in the CAN bus line between the ETACS-ECU and the A/C-ECU (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).

STEP 5. Check whether the diagnosis code is reset.

Recheck if the diagnosis code is set.

(1)Erase the diagnosis code.

(2)Ignition switch: LOCK (OFF) to ON

(3)Check if the diagnosis code is set.

Q. Is the diagnosis code set?

	Replace the A/C-ECU, and then go to Step 6.

	A poor connection, open circuit or other intermittent malfunction in the CAN bus line between the ETACS-ECU and the A/C-ECU (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).

STEP 6. Check whether the diagnosis code is reset.

Recheck if the diagnosis code is set.

(1)Erase the diagnosis code.

(2)Ignition switch: LOCK (OFF) to ON

(3)Check if the diagnosis code is set.

Q. Is the diagnosis code set?

	Return to Step 1.

	The procedure is complete.