Code No.U1206 Communication standby command the flag malfunction
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If diagnosis code U1206 is set in the combination meter, diagnose the CAN main bus line.
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TROUBLE JUDGMENT
The combination meter continues the CAN communication by receiving the door open signals, indicator illumination request signals or communication standby indication from ETACS-ECU when the ignition switch is in the LOCK (OFF) position. If there is a contradiction between the received signals, DTC U1206 will be stored.
COMMENTS ON TROUBLE SYMPTOM
Current trouble
- The door switch system of the ETACS-ECU, the ETACS-ECU, or the combination meter may be defective.
Past trouble
- Carry out diagnosis with particular emphasis on connector(s) or wiring harness between the ETACS-ECU and the door switch, and the power supply system to the ETACS-ECU. For diagnosis procedures, refer to "How to cope with past trouble" (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points
).
PROBABLE CAUSES
- Damaged harness wires and connectors
- Malfunction of ETACS-ECU
- Malfunction of combination meter
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.
Q.
Is the check result normal?
Go to Step 2.
Repair the CAN bus lines (refer to GROUP 54D - Troubleshooting ). Repair the CAN bus line and go to Step 4.
STEP 2. M.U.T.-III other system diagnosis code
Check that the ETACS-ECU sets a diagnosis code.
Q.
Is the diagnosis code set?
Diagnose the ETACS (refer to GROUP 54A - Troubleshooting ).
Go to Step 3.
STEP 3. Check whether the diagnosis code is reset.
Replace the ETACS-ECU, and then check that the diagnosis code is not reset.
Q.
Is the check result normal?
Go to Step 4.
Replace combination meter and then go to step 4.
STEP 4. Check whether the diagnosis code is reset.
Recheck if the diagnosis code is set.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch to "ON" position.
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(3)On completion, check that the diagnosis code is not reset.
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Q.
Is the check result normal?
The procedure is complete.
Go to Step 1.