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DTC Description
 
 
DTC DETECTION LOGIC
DTC M.U.T.-III SE screen terms
(Trouble diagnosis content)
DTC detection condition
U1327 52MAC 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 ADAS control unit 2
  • ADAS control unit 2 used in other vehicles is installed in the vehicle
  • ADAS control unit 2
 
 
FAIL-SAFE
The following systems are canceled.
  • Vehicle-to-vehicle distance control mode
  • Conventional (fixed speed) cruise control mode
  • Steering wheel assistance function
  • FCM
  • Rear AEB
  • PFCW
  • LDW
  • LDP
  • BSW
  • Active Blind Spot Assist [ABSA]
  • RCTA
  • TSR
  • DAA
 
 
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 applicable DTC detected?
Refer to DTC DescriptionDTC Description.
 
2.PERFORM DTC CONFIRMATION PROCEDURE
With M.U.T.-III SE
  1. Turn the electric motor switch ON.
  2. Perform “MAC key writing”. Refer to Work Procedure.
  3. Perform “MAC Diagnosis” of “ICC/ADAS 2” using M.U.T.-III SE.
Is DTC “U1327-52” detected as the current malfunction?
Refer to DTC Diagnosis ProcedureDiagnosis Procedure.
-1 To check malfunction symptom before repair: Refer to Intermittent IncidentIntermittent Incident.
-2 Confirmation after repair: INSPECTION END