Code No.B1417:
Front impact sensor (LH) voltage error
caution |
If diagnosis code B1417 is set in the SRS-ECU, always
diagnose the CAN main bus line.
|
OPERATION
The front impact sensor (LH) transmits acceleration data to the SRS-ECU. The SRS-ECU then determines
whether to operate the front air bags, and then outputs an ignition signal when necessary. The front
impact sensor (LH) also diagnoses itself, and sends a diagnosis code to the SRS-ECU if a malfunction
occurs.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code will set when the power supply voltage to the front impact sensor
(LH) remains less than a predetermined value for one second.
PROBABLE CAUSES
- Damaged wiring harness or connectors
- Malfunction of the front impact sensor (LH)
- Malfunction of the SRS-ECU
|
STEP 1. M.U.T.-III CAN bus diagnostics
|
|
Use the M.U.T.-III to diagnose the CAN bus lines.
|
|
Q.
Is the check result normal?
|
|
Go to Step 2.
|
|
|
|
Repair the CAN bus line (Refer to GROUP 54C, Diagnosis ).
|
|
|
|
STEP 2. Check whether the diagnosis code is reset.
|
|
Check again if the diagnosis code is set.
|
|
(1)Erase the diagnosis code.
|
|
(2)Ignition: "LOCK" (OFF) position to "ON"
|
|
(3)On completion, check that the diagnosis code is not reset.
|
|
Q.
Is the diagnosis code set?
|
|
Go to Step 3.
|
|
|
|
There is an intermittent malfunction such as poor engaged connector(s) or open
circuit (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).
|
|
|
|
STEP 3. Check of short to power supply, short to earth, and open circuit
in FLH-, FLH+ line between SRS-ECU connector and front impact sensor (LH) connector.
|
|
note |
After inspecting intermediate connector inspect the wiring harness. If the intermediate
connector is damaged, repair or replace it.
|
|
|
Q.
Is the check result normal?
|
|
Go to Step 4.
|
|
|
|
Repair the wiring harness.
|
|
|
|
STEP 4. Check the front impact sensor (LH).
|
|
(1)Disconnect the negative battery terminal.
|
|
(2)Alternate the front impact sensor (LH) and the front impact sensor (RH), and then
install the alternated sensor.
|
|
(3)Connect the negative battery terminal.
|
|
(4)Erase the diagnosis code from memory, and check the diagnosis code.
|
|
Q.
Is diagnosis code B1417 set?
|
|
Replace the front impact sensor (LH) with a new one (Refer to ).
|
|
|
|
Go to Step 5.
|
|
|
|
STEP 5. Check whether the diagnosis code is reset.
|
|
Q.
Is diagnosis code B1417 set?
|
|
Replace the SRS-ECU (Refer to ).
|
|
|
|
An intermittent malfunction is suspected (Refer to GROUP 00, How to Cope with
Intermittent Malfunction ).
|
|
|