Code No. U1901:
K-line slave lost among BMUs
Code No. U1911: K-line between BMUs reception error
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If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior to this diagnosis, always diagnose the CAN bus lines.
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MAIN BATTERY MANAGEMENT SYSTEM CIRCUIT
OPERATION
- The CAN communication between BMUs and EV-ECU is backed
up by the K-LINE communication.
DIAGNOSIS CODE SET CONDITIONS
- If the K-LINE (back-up) communication data from the BMU
cannot be received, the diagnosis code No. U1901 will be set.
- If the K-LINE (back-up) communication data from the BMU is parity error or checksum,
the diagnosis code No. U1911 will be set.
PROBABLE CAUSES
- Damaged wiring harness or connector(s)
- Malfunction of the BMU system
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STEP 1. M.U.T.-III CAN bus diagnosis
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Use the M.U.T.-III to diagnose the CAN bus lines.
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Q.
Is the check result normal?
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 Go to Step 3.
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 Repair the CAN bus line. (Refer to GROUP 54C - Troubleshooting  .)
Then go to Step 2.
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STEP 2. Check whether the diagnosis code is reset.
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Check again if the diagnosis code No. U1901 or No. U1911 is set to the EV-ECU.
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(1)Erase the stored diagnosis code.
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(2)Set the electric motor switch from the "LOCK" (OFF) position to the "ON" position.
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(3)Check if the diagnosis code is set.
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Q.
Is the diagnosis code set?
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Go to Step 3.
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This diagnosis is complete.
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STEP 3. Connector check: C-107 BMU connector, C-106 EV-ECU connector
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Q.
Is the check result normal?
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Go to Step 4.
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Repair the damaged connector.
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STEP 4. Check the wiring harness between C-107 BMU connector terminal
No. 8 and C-106 EV-ECU connector terminal No. 16.
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Check the signal lines for open circuit.
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Q.
Is the check result normal?
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Go to Step 5.
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Repair the wiring harness.
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STEP 5. Use M.U.T.-III to confirm a diagnosis code of other systems.
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Check if the diagnosis code is set to BMU.
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Q.
Is the diagnosis code set?
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Carry out troubleshooting for the BMU. (Refer to Diagnosis Code Chart .)
Then go to Step 6.
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Go to Step 6.
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STEP 6. Diagnosis code recheck
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Check again if the diagnosis code is set to the EV-ECU.
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(1)Erase the stored diagnosis code.
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(2)Set the electric motor switch from the "LOCK" (OFF) position to the "ON" position.
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(3)Check if the diagnosis code is set.
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Q.
Is the diagnosis code set?
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Return to Step 1.
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The diagnosis is complete.
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