Module Registration (Update & Verification)

Error message	Cause	Corrective action
Diagnostic Communication Error. End processing An Error occurred in the following ECUs. ECM*, ECM*•••	Attempted to communicate with the corresponding ECM when it was not connected.	Perform the basic diagnosis of the corresponding ECM, and repeat the procedure from the beginning. If the fault is not fixed, replace the corresponding ECM.
	Attempted to communicate with the corresponding ECM when it was in a situation where communication was not possible.	Turn the ignition switch OFF → ON, and then perform the procedure again from the beginning. If the fault is not fixed, perform the basic diagnosis of the corresponding ECM. If the fault still exists, replace the corresponding ECM.
	Attempted to update the key within three seconds after the ignition switch was turned OFF → ON.	Turn the ignition switch OFF → ON, and then perform the procedure again from the beginning. (Turn the ignition switch to ON, wait for 3 seconds or more, and perform the procedure.)
Battery voltage is low. Check the condition of the vehicle and try again. End processing.	The vehicle power supply voltage is 10 V or less. (control module for voltage measurement: Central gateway control module)	Perform the diagnosis for LAN system. Ref. to LAN SYSTEM (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE .
The Ignition is OFF. After confirming that the Ignition is ON, please press the Rerun Button.	Attempted to update or verify the key with the ignition switch OFF.	Perform the procedure again with the ignition switch ON.
The Ignition is ON. After confirming that the Ignition is OFF, please press the Rerun Button.	Attempted to continue the key update with the ignition switch ON against the instruction to turn the ignition switch to OFF.	Follow the instructions on the screen.
	The ignition switch was turned to ON before the instruction to do so was displayed on the screen.	Follow the instructions on the screen.
Failed to update MAC Key. End processing. ECM*: Success ECM: Update failed ECM**: Result verification failed•••	Attempted to manage the key when the corresponding ECM was not connected.	Perform the basic diagnosis of the corresponding ECM, and repeat the procedure from the beginning. If the fault is not fixed, replace the corresponding ECM.
	Key update failed on the indicated ECM.	Reconnect the corresponding ECM connector and repeat the procedure. If the fault is not fixed, perform module registration (update & verify) again.
Failed to update MAC Key. End processing. ECM*: Success ECM*: Verification failed•••	Key verification failed on the indicated ECM.	Reconnect the corresponding ECM connector and repeat the procedure. If the fault is not fixed, perform module registration (update & verify) again.
There is an ECU that has detected a Key update failure DTC. End processing. ECM*: Not detected ECM*: Detected•••	The communication key of the central gateway control module does not match other ECMs during key verification.	Perform the diagnosis of DTCs B1E00, C1E00 and P1E00. Ref. to CENTRAL GATEWAY (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B1E00 REGISTRATION FAULT OF AUTHENTICATION UNIT . Ref. to CENTRAL GATEWAY (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC C1E00 REGISTRATION FAULT OF AUTHENTICATION UNIT . Ref. to CENTRAL GATEWAY (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC P1E00 REGISTRATION FAULT OF AUTHENTICATION UNIT .