Code No.B1448:
Side-Impact sensor (Rear) (RH) (Squib) for Power Supply Circuit
Code
No.B1449: Side-Impact
sensor (Rear) (RH) (Squib) for Communication System
![](../../../img/52/W4X52X010A00ENG.png)
caution |
If diagnosis code B1448 or B1449 is set in the
SRS-ECU, always
diagnose the CAN main bus line.
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OPERATION
The side impact sensor (Rear) includes an analogue G
sensor and CPU, etc. The CPU monitors
the analogue G sensor output signal. If the CPU judges that the curtain air
bags should be deployed,
it sends a fire signal to the SRS-ECU to deploy the curtain air bags. In
addition, the CPU diagnoses
the internal components of the side impact sensor (Rear). If a malfunction
occurs, it requests
the SRS-ECU to set a diagnostic trouble code.
DIAGNOSIS CODE SET CONDITIONS
These diagnosis codes are set if
communication between the side impact sensor (Rear) (RH)
and the SRS-ECU is not possible or communication is faulty.
PROBABLE CAUSES
- Damaged wiring harnesses or connectors
- Malfunction of the side impact sensor (Rear) (RH)
- Malfunction of the SRS-ECU
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STEP 1. M.U.T.-III CAN bus diagnostics
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Use the M.U.T.-III to diagnose the CAN bus
lines.
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Q.
Is the check result normal?
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Go to Step 2 .
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Repair
the CAN bus line (Refer to GROUP 54F, Diagnosis ).
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STEP 2. Check whether the diagnosis code is reset.
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Check again if the diagnosis code is
set.
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(1)Erase the diagnosis code.
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(2)Ignition: LOCK (OFF) position to ON
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(3)On completion, check that the diagnosis code is not
reset.
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Q.
Is the diagnosis code set?
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Go to Step 3 .
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There
is an intermittent malfunction such as poor engaged connector(s) or open
circuit (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).
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STEP 3.Check the side impact sensor (Rear) (RH) (M.U.T.-III diagnosis
code).
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(1)Disconnect the negative battery terminal.
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(2)Replace the side impact sensor (Rear) (RH) with the side
impact sensor (Rear) (LH).
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(3)Connect the negative battery terminal.
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(4)Erase diagnostic trouble code memory, and check the
diagnostic trouble code.
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Q.
Is DTC B1458 or B1459 set?
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Replace the side impact sensor
(Rear) (RH) with a new one (Refer to ).
Then go to Step 5 .
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Go to Step 4 .
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STEP 4. Check the harness wires for open circuit or short circuit
between SRS-ECU connector C-118 (terminal No.67 and 68) and side impact
sensor (Rear) (RH) connector
D-09 (terminal No.1 and 2).
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![](../../../img/52/AC311438AC00ENG.png)
![](../../../img/52/AC311615AB00ENG.png)
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Q.
Is the check result normal?
Go to Step 5 .
Repair the harness wires between
SRS-ECU connector C-118 (terminal No.67 and 68)
and side impact sensor (Rear) (RH) connector D-09 (terminal No.1 and
2).
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STEP 5. Check whether the diagnosis code is reset.
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Q.
Is diagnosis code B1448 or B1449 set?
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Replace the SRS-ECU (Refer to ).
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An
intermittent malfunction is suspected (Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service
Points ).
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