[Previous][Next]
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:
  • Electric motor switch is in the ON position.
  • BSW-ECU (slave) system voltage is at 9-16 volts.
 
 
DIAGNOSTIC FUNCTION AND TROUBLE JUDGMENT
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
  • Malfunction of blind spot warning switch (stuck on)
  • Malfunction of gateway-ECU
  • Malfunction of BSW-ECU (master/slave)
  • Damaged harness wires and connectors
 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-IIISE), read the BSW-ECU (master) DTC.
Check if DTC C2321 is set in the BSW-ECU (master).
(1)
cautionTo prevent damage to scan tool (M.U.T.-IIISE), always turn the electric motor switch to the "OFF" position before connecting or disconnecting scan tool (M.U.T.-IIISE).
Connect scan tool (M.U.T.-IIISE). Refer to "How to connect the Scan Tool (M.U.T.-IIISE) ."
(2) Turn the electric motor switch from the OFF position to the ON position.
(3) Check if the DTC is set.
Is the DTC set?
Troubleshoot the BSW-ECU (master) (Refer to ).
Go to Step 2.
 
STEP 2. Using scan tool (M.U.T.-IIISE), read the BSW-ECU (slave) DTC again.
Check again if the DTC is set in the BSW-ECU (slave).
(1) Erase the DTC.
(2) Turn the electric motor switch from the 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.
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
 
STEP 3. Using scan tool (M.U.T.-IIISE), read the BSW-ECU (slave) DTC again.
Check again if the DTC is set in the BSW-ECU (slave).
(1) Erase the DTC.
(2) Turn the electric motor switch from the 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.