CODE No. C2321
BSW SW input malfunction
| caution |
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 (master) receives a signal from the blind spot warning switch via CAN communication
with the gateway-ECU.
CHECK CONDITION
When all of the conditions below are satisfied:
- Ignition switch is in the ON position.
- BSW-ECU (master) 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 (master) sets diagnosis code No.C2321.
PROBABLE CAUSES
- Malfunction of blind spot warning switch (stuck on)
- Malfunction of gateway-ECU
- Malfunction of BSW-ECU (master)
- Damaged harness wires and connectors
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III other system data list
Using the gateway-ECU data list, check the blind spot warning switch signal.
- When the blind spot warning switch is pressed.
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Item No.
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Item name
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Normal condition
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Item 5
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BSW SW
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ON
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- When the blind spot warning switch is not pressed.
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Item No.
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Item name
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Normal condition
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Item 5
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BSW SW
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OFF
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OK: Normal condition is displayed.
Q.
Is the check result normal?
Go to Step 5.
NO 
: Go to Step 2
STEP 2. Check of short to earth in DI05 line between gateway-ECU connector
and blind spot warning switch connector.
Q.
Is the check result normal?
Go to Step 3
Repair the connector(s) or wiring harness.
STEP 3. Check the blind spot warning switch.
Refer to blind spot warning switch Inspection 
.
Q.
Is the check result normal?
Go to Step 4
Replace the blind spot warning switch.
STEP 4. M.U.T.-III other system data list
Using the gateway-ECU data list, check the blind spot warning switch signal.
- When the blind spot warning switch is pressed.
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Item No.
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Item name
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Normal condition
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Item 5
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BSW SW
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ON
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- When the blind spot warning switch is not pressed.
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Item No.
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Item name
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Normal condition
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Item 5
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BSW SW
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OFF
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OK: Normal condition is displayed.
Q.
Is the check result normal?
Intermittent malfunction is suspected (Refer to GROUP 00 - How to Use Troubleshooting/Inspection
Service Points - How to cope with Intermittent Malfunction).
NO : Replace the gateway-ECU.
STEP 5. Check whether the diagnosis code is set again.
Check again if the diagnosis code is set in the BSW-ECU (master).
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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 (master).
Intermittent malfunction is suspected (Refer to GROUP 00 - How to Use Troubleshooting/Inspection
Service Points - How to cope with Intermittent Malfunction).