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DTC B1406: Malfunction of front impact sensor (RH)
DTC B1416: Malfunction of front impact sensor (LH)
 
 
cautionIf DTC B1406 or B1416 is set in the SRS-ECU, always diagnose the CAN main bus line.
 
 
DTC SET CONDITIONS
These DTC is set if the following condition is detected from the front impact sensor output:
  • Front impact sensor is not operating.
  • Front impact sensor characteristic is abnormal.
  • Front impact sensor (RH) output is abnormal.
 
 
TROUBLESHOOTING HINTS
  • Malfunction of the front impact sensor
  • Malfunction of the CAN bus
 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-IIISE), diagnose the CAN bus line.
(1)
cautionTo prevent damage to scan tool (M.U.T.-IIISE), always turn off the power supply mode of the electric motor switch 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 ."
(2) Turn on the power supply mode of the electric motor switch.
(3) Diagnose the CAN bus line.
(4) Turn off the power supply mode of the electric motor switch.
Is the CAN bus line found to be normal?
Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54C, Diagnosis ).
 
STEP 2. Check the front impact sensor (RH).
(1) Check that the negative battery terminal is disconnected. If the negative battery terminal is connected, disconnect it.
(2) Alternate the front impact sensor (RH) and the front impact sensor (LH), and then install the alternated sensor.
(3) Connect the negative battery terminal.
(4) After erasing the DTC memory, check the DTC again.
(5) Disconnect the negative battery terminal.
Is either DTC B1406 or B1416 set?
Replace the front impact sensor with a new one (Refer to ).
Go to Step 3.
 
STEP 3. Recheck for DTC.
Check again if the DTC is set.
(1) Erase the DTC.
(2) Turn on the power supply mode of the electric motor switch.
(3) Check if the DTC is set.
(4) Turn off the power supply mode of the electric motor switch.
Is either DTC B1406 or B1416 set?
Replace SRS-ECU (Refer to ).
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).