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DTC C2321 BSW SW input malfunction
 
 
cautionBefore replacing the ECU, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.
 
 
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 to 16 volts.
 
 
DIAGNOSTIC FUNCTION AND JUDGMENT CRITERIA
If the gateway-ECU detects the blind spot warning switch pressed state for 60 seconds or more continuously, the BSW-ECU (slave) sets DTC C2321.
 
 
TROUBLESHOOTING HINTS
  • The blind spot warning switch (stuck on) may be defective
  • The gateway-ECU may be defective
  • The BSW-ECU (master/slave) may be defective
  • The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector
 
 
DIAGNOSIS
STEP 1. Check whether the BSW-ECU (master) sets a DTC.
Check if DTC C2321 is set in the BSW-ECU (master).
cautionTo prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-III).
Connect scan tool (M.U.T.-III). Refer to "How to connect the Scan Tool (M.U.T.-III) ."
Is the DTC set?
Troubleshoot the BSW-ECU (master) (Refer to ).
Go to Step 2.
 
STEP 2. Check whether the DTC is set again.
Check again if the DTC is set in the BSW-ECU (slave).
(1) Erase the DTC.
(2) Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
(3) Check if the DTC is set.
Is the DTC 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 DTC is set again.
Check again if the DTC is set in the BSW-ECU (slave).
(1) Erase the DTC.
(2) Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
(3) Check if the DTC is set.
Is the DTC set?
Use the BSW-ECU (slave), which has been removed at step 2, as the BSW-ECU (master).
This diagnosis is complete.