Code No. U1090: Local CAN (for main battery) error (BMU)
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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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OPERATION
- BMU communicates with EV-ECU via CAN.
DIAGNOSIS CODE SET CONDITIONS
- When the diagnosis code No. U1082 or No. U1940 is set to the BMU, the diagnosis code No. U1090 will be set.
PROBABLE CAUSES
- 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. Diagnosis code recheck after resetting CAN bus lines
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Check again if the diagnosis code No. U1090 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. Use M.U.T.-III to confirm a diagnosis code of other systems.
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Check if the diagnosis code No. U1082 or U1940 is set to the BMU.
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Q.
Is the diagnosis code set?
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Carry out troubleshooting for the diagnosis code No. U1082 (refer to ) or U1940. Then go to Step 4.
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Go to Step 4.
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STEP 4. 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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