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DTC Description
 
 
DTC DETECTION LOGIC
DTC M.U.T.-III SE screen terms
(Trouble diagnosis content)
DTC detection condition
U1327 54MAC key update
(Message Authentication Code key update)
Diagnosis condition —
Signal (terminal) —
Threshold MAC key is not written after ADAS control unit 2 replacement
Diagnosis delay time —
 
 
POSSIBLE CAUSE
  • Writing of MAC key has not been executed
  • 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
  • AEB
  • RAB
  • PFCW
  • LDW
  • LDP
  • BSW
  • Active Blind Spot Assist [ABSA]
  • RCTA
  • TSR
  • DAA
 
 
CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
With M.U.T.-III SE
  1. Ignition switch ON.
  2. Perform “MAC Diagnosis” of “ACC/ADAS 2” using M.U.T.-III SE.
Is DTC “U1327-54” 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