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The heater controller assembly (A/C-ECU) receives air conditioner control-related signals
from the combination meter or CAN box unit (MMCS) via the CAN bus lines. If the ECU cannot receive
any of the air conditioner control-related signals from the combination meter or CAN box unit
(MMCS), diagnosis code U0245 will be stored.
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Current trouble
- Connector(s) or wiring harness in the CAN bus lines between the combination meter
or CAN box unit (MMCS) and the heater controller assembly (A/C-ECU), the power supply system
to the combination meter or CAN box unit (MMCS), the combination meter or CAN box unit (MMCS) itself,
or the heater controller assembly (A/C-ECU) may be defective.
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Past trouble
- Carry out diagnosis with particular emphasis on connector(s) or wiring harness in
the CAN bus lines between the heater controller assembly (A/C-ECU) and the combination meter
or CAN box unit (MMCS), and the power supply system to the combination meter or CAN box unit (MMCS).
For diagnosis procedures, refer to "How to treat past trouble" (Refer to GROUP 00 -
How
to Treat Past Trouble
 ).
| note |
For a past trouble, you can not find it by the M.U.T.-III CAN bus diagnostics even if
there is any failure in CAN bus lines. In this case, refer to GROUP 00, How to Cope with Intermittent
Malfunction and check the CAN bus lines. You can narrow down
the possible cause of the trouble by referring to the diagnosis code, which is set regarding
the CAN communication-linked ECUs (Refer to GROUP 54C -
CAN Bus Line Diagnostic Flow ).
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| caution |
If the ignition switch is turned to the ON position without starting
the engine, the diagnosis code U0184 (past trouble) may be set to the heater controller assembly
(A/C-ECU) after three minutes.
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- Damaged wiring harness or connectors
- Malfunction of the audio
- Malfunction of the heater controller assembly (A/C-ECU)
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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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 Repair the CAN bus lines (Refer to GROUP 54C, Troubleshooting ).
On completion, go to Step 6.
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Check whether the audio-related diagnosis code is set.
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Q.
Is the diagnosis code set?
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 Diagnose the audio. Refer to .
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Check if a diagnosis code, which relates to CAN communication-linked systems below, is
set.
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- Combination meter
U0245: AND CAN timeout
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Q.
Is the diagnosis code set?
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Recheck if the diagnosis code is set.
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(1)Erase the diagnosis code.
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(2)Ignition switch: LOCK (OFF) to ON
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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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Replace the combination meter or CAN box unit (MMCS), and then go to Step 6.
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A poor connection, open circuit or other intermittent malfunction in the CAN bus
line between the combination meter or CAN box unit (MMCS) and the heater controller assembly
(A/C-ECU) (Refer to GROUP 00 -
How to Cope with Intermittent Malfunction ).
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Recheck if the diagnosis code is set.
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(1)Erase the diagnosis code.
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(2)Ignition switch: LOCK (OFF) to ON
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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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Replace the heater controller assembly (A/C-ECU), and then go to Step 6.
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A poor connection, open circuit or other intermittent malfunction in the CAN bus
line between the combination meter or CAN box unit (MMCS) and the heater controller assembly
(A/C-ECU) (Refer to GROUP 00 -
How to Cope with Intermittent Malfunction ).
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Recheck if the diagnosis code is set.
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(1)Erase the diagnosis code.
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(2)Ignition switch: LOCK (OFF) to ON
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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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The procedure is complete.
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