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DTC No. P1B12-04 Sub CPU CAUTION Lighting Diagnosis
DTC No. P1B13-04 Sub CPU Latent Fault Diagnosis
 
 
 
 
MONITOR EXECUTION
Continuous
 
 
MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)
Other Monitor (There is no temporary DTC set in memory for the item monitored below)
  • BMU monitor
Sensor (The sensor below is determined to be normal)
  • Drive battery temperature sensor
 
 
DTC SET CONDITIONS
Logic Flow Chart
Check Condition
  • BMU wake-up: ON
Judgment Criterion <DTC No. P1B12-04 >
  • The malfunction status from sub CPU is in fail condition.
Judgment Criterion <DTC No. P1B13-04 >
  • The performance status from sub CPU is in fail condition.
 
 
OBD-II DRIVE CYCLE PATTERN
 
 
TROUBLESHOOTING HINTS
  • Malfunction of the BMU system
 
 
DIAGNOSIS
Required Special Tools:
  • MB992744: Vehicle communication interface-Lite (V.C.I.-Lite)
  • MB992745: V.C.I.-Lite main harness A
  • MB992747: V.C.I.-Lite USB cable short
  • MB992748: V.C.I.-Lite USB cable long
1.Check of BMU2 DTC
Check whether the BMU2 sets the DTC.
Is the DTC set?
Troubleshoot the set DTCs. Then,
The trouble can be an intermittent malfunction (Refer to General Information - How to Use Troubleshooting/Inspection Service Points, How to Cope with Intermittent Malfunctions HOW TO COPE WITH INTERMITTENT MALFUNCTIONS).
 
2.Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to OBD-II Drive Cycle OBD-II DRIVE CYCLE.
(2) Check the DTC.
Is the DTC set?
Retry the troubleshooting.
The procedure is complete.