CODE No. C2321
BSW SW input malfunction
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Before replacing the ECU,
ensure that the power supply circuit, the earth circuit and the communication circuit are normal.
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OPERATION
BSW-ECU (slave) receives a signal from the blind spot warning switch via CAN communication with
the gateway-ECU and BSW-ECU (master).
CHECK CONDITION
When all of the conditions below are satisfied:
- Ignition switch is in the ON position.
- BSW-ECU (slave) system voltage is at 9-16 V.
DIAGNOSTIC FUNCTION AND JUDGEMENT CRITERIA
If the gateway-ECU detects the blind spot warning switch pressed state for 60 seconds
or more continuously, the BSW-ECU (slave) sets diagnosis code No.C2321.
PROBABLE CAUSES
- Malfunction of blind spot warning switch (stuck on)
- Malfunction of gateway-ECU
- Malfunction of BSW-ECU (master/slave)
- Damaged harness wires and connectors
DIAGNOSIS PROCEDURE
STEP 1. Check whether the BSW-ECU (master) sets a diagnosis code.
Check if diagnosis code No. C2321 is set in the BSW-ECU (master).
Q.
Is the diagnosis code set?
Troubleshoot the BSW-ECU (master) (Refer to 
).
Go to Step 2.
STEP 2. Check whether the diagnosis code is set again.
Check again if the diagnosis code is set in the BSW-ECU (slave).
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(1)Erase the diagnosis code.
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(2)Turn the ignition 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?
Replace the BSW-ECU (slave). Then Go to Step 3
Intermittent malfunction is suspected (Refer to GROUP 00 - How to Use
Troubleshooting/Inspection Service Points - How to cope with Intermittent Malfunction).
STEP 3. Check whether the diagnosis code is set again.
Check again if the diagnosis code is set in the BSW-ECU (slave).
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(1)Erase the diagnosis code.
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(2)Turn the ignition 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?
Use the BSW-ECU (slave), which has been removed at step 2, as the BSW-ECU (master).
This diagnosis is complete.