Code No. B1433: Left
side-airbag module (squib) system (shorted to squib circuit power
supply)
caution |
If diagnosis code No. B1433
is set in the SRS-ECU, be sure to diagnose the CAN bus line.
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OPERATION
In case of side collision, when the impact exceeding the
threshold is applied to the vehicle,
and when the impact is simultaneously detected (turned ON) by the side impact
sensor as well
as by the analogue G-sensor in SRS-ECU, the electric current is supplied from
SRS-ECU to the
side-airbag module (squib) of impacted side.
TROUBLE JUDGEMENT
The code is set when the input terminal of
SRS-ECU side-airbag module (squib) is shorted
to power supply.
PROBABLE CAUSES
- Damaged wiring harness and connectors
- Side-airbag module (squib) harness shorted to power supply
- Malfunction of SRS-ECU
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STEP 1. M.U.T.-III CAN bus diagnostics
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Use 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 54C - Troubleshooting).
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STEP 2. Check whether the diagnosis code is set again.
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(1)Connect the negative battery terminal.
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(2)After erasing the diagnosis code memory, check the
diagnosis code again.
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(3)Disconnect the negative battery terminal.
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Q.
Is diagnosis code No. B1433 set?
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Go to Step 3.
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Intermittent malfunction (Refer to
GROUP 00 - How to Use Troubleshooting/Inspection
Service Points - How to Cope with Intermittent Malfunction).
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STEP 3. Diagnosis check by dummy resistor connection
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(1)Check that the negative battery terminal is disconnected.
If the negative battery
terminal is connected, disconnect it.
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![](../../../img/52/AC706606AC00ENG.png)
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(2)Disconnect the left side-airbag module
connector, unlock the connector by sliding the
locking button to the direction of the arrow as shown in the figure, and
then disconnect the connector.
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![](../../../img/52/AC507310BT00ENG.png)
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(3)Connect special tool dummy resistor
(MB991865) to special tool resistor harness (MB991866). (4)
caution |
Do not insert a probe directly into the terminal
from the connector
front side as the connector contact pressure may be weakened.
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Insert the resistor harness probe from the back of left side-airbag
module harness side
connector. (5)Connect the negative battery terminal. (6)After erasing
the diagnosis code memory, check the diagnosis code again. (7)Disconnect
the negative battery terminal.
Q.
Is diagnosis code No. B1433 set?
Go to Step 4.
Replace the front seatback pad and
frame assembly.
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STEP 4. Voltage measurement at the SRS-ECU connector
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(1)Check that the negative battery terminal is disconnected.
If the negative battery
terminal is connected, disconnect it.
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(2)Disconnect the SRS-ECU connector.
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![](../../../img/52/AC706606AC00ENG.png)
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(3)
danger |
To release the connector short spring in the
following operations,
disconnect this side-airbag module connector, and keep the squib circuit
shorted.
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Disconnect the left side-airbag module connector, unlock the
connector by sliding the
locking button to the direction of the arrow as shown in the figure, and
then disconnect the connector.
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![](../../../img/52/ACE02056AM00ENG.png)
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(4)
caution |
The short spring may not be released due to the
insufficient insertion. Therefore, insert
the insulator for 4 mm or more.
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Insert an insulator (width: 3 mm, thickness: 0.5 mm) such as cable
tie between the SLS-,
SLS+ line and the short spring, and then release the short
spring. (5)Connect the negative battery terminal. (6)Ignition switch:
"ON" (7)Take the measurements below at the SRS-ECU harness side
connector.
- Voltage between SLS-, SLS+ line and body earth
OK: 1 V or less (8)Disconnect the negative battery
terminal.
Q.
Is the check result normal?
Go to Step 5.
Repair the wiring harness SLS-,
SLS+ line between the SRS-ECU connector
and the left side-airbag module connector.
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STEP 5. Check whether the diagnosis code is set again.
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Q.
Is diagnosis code No. B1433 set?
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Replace SRS-ECU.
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Intermittent malfunction (Refer to
GROUP 00 - How to Use Troubleshooting/Inspection
Service Points - How to Cope with Intermittent Malfunction).
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