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DTC B1406 Malfunction of G-sensor inside right front impact sensor
DTC B1416 Malfunction of G-sensor inside left front impact sensor
 
 
cautionIf DTC B1406 or B1416 is set in SRS-ECU, be sure to diagnose the CAN bus line.
 
 
TROUBLE JUDGMENT
  • Analog G-sensor in front impact sensor does not operate.
  • Characteristics of analog G-sensor in front impact sensor are abnormal.
  • Output of analog G-sensor in front impact sensor is abnormal.
 
 
PROBABLE CAUSES
  • Malfunction of CAN bus line
  • Malfunction of right front impact sensor (DTC B1406)
  • Malfunction of left front impact sensor (DTC B1416)
 
 
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 the ignition switch to the "LOCK" (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 ."
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
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. Front impact sensor check.
(1) Check that the negative battery terminal is disconnected. If the negative battery terminal is connected, disconnect it.
(2) A front impact sensor is checked in the following way.
  • Replace the front impact sensor with new part.
(3) Connect the negative battery terminal.
(4) After erasing the DTC memory, check the DTC again.
(5) Disconnect the negative battery terminal.
Is the DTC set?
Replace the SRS-ECU (Refer to ).
An intermittent malfunction is suspected (Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).