DTC Description

DTC DETECTION LOGIC

DTC No.	M.U.T.-III SE screen items (Trouble diagnosis content)	DTC Detection Condition
U1327-52	MAC key update (Message Authentication Code key update)	Diagnosis condition	-
		Signal (terminal)	-
		Threshold	MAC key writing is incomplete.
		Diagnosis delay time	-

POSSIBLE CAUSE

Network communication error between M.U.T.-III SE and around view monitor control unit
Around view monitor control unit used in other vehicles is installed in the vehicle
Around view monitor control unit

FAIL-SAFE

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DTC CONFIRMATION PROCEDURE

1.CHECK DTC PRIORITY

If DTC U1327-52 is displayed with DTC U1327-54, first perform the trouble diagnosis for DTC U1327-54.

Is DTC U1327-54 detected?

2.PERFORM DTC CONFIRMATION PROCEDURE

With M.U.T.-III SE

Turn the electric motor switch ON.
Perform “MAC key writing”. Refer to Description.
Perform "Diagnostic Trouble Code" of “Multi Around Monitor” using M.U.T.-III SE.

Is DTC U1327-52 detected as the current malfunction?

-1To check malfunction symptom before repair: Refer to Intermittent IncidentIntermittent Incident

-2Confirmation after repair: INSPECTION END