Code No.91:
Side impact sensor (LH) voltage error
![](../../../img/52/W4X52X011A00ENG.png)
OPERATION
The side impact sensor includes an analog G sensor and
CPU, etc. The CPU monitors the
analog G sensor output signal. If the CPU judges that the side-airbags should
be deployed, it
sends a fire signal to the SRS-ECU to deploy the side-airbags. Besides that,
the CPU diagnoses
the internal components of the side impact sensor. If a malfunction occurs, it
requests the
SRS-ECU to set a diagnosis code.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code will set when
the power supply voltage to the side impact sensor (LH) remains
less than a predetermined value for 5 seconds. However, if the system returns
to normal condition,
code number 91 will be erased automatically and the SRS warning lamp will go
out.
PROBABLE CAUSES
- Damaged wiring harness or connectors
- Malfunction of the side-airbag module (LH)
- Malfunction of the SRS-ECU
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STEP 1. Check the harness wires for open circuit or short
circuit between SRS-ECU connector C-146 (terminal No.34 and 36) and side
impact sensor (LH)
connector D-18 (terminal No.1 and 2).
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![](../../../img/52/AC311438AG00ENG.png)
![](../../../img/52/AC313429AO00ENG.png)
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Q.
Is the check result normal?
Go to Step 2.
Repair the harness wires between
SRS-ECU connector C-146 (terminal No.34 and 36)
and side impact sensor (LH) connector D-18 (terminal No.1 and
2).
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STEP 2. Check the side impact sensor (LH) (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 (LH) with the side impact
sensor RH).
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(3)Connect the negative battery terminal.
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(4)Erase diagnosis code from memory, and check the diagnosis
code.
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Q.
Is diagnosis code 91 set?
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Replace the SRS-ECU (Refer to ).
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Replace the side impact sensor
(LH) with a new one (Refer to ).
Go to Step 3.
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STEP 3. Check whether the diagnosis code is reset.
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Q.
Is diagnosis code 91 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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