Code No.B1441: Curtain air bag module (squib) (RH) system (open-circuited
in the squib circuit)
![](../../../img/52/W4X52E012A00ENG.png)
caution |
If diagnosis code B1441 is set in the SRS-ECU, always
diagnose the CAN main bus line.
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OPERATION
The SRS-ECU judges how severe a collision is by
detecting signals from the side impact sensors and the side-airbag safing
G-sensor. If the impact is over a predetermined level, the SRS-ECU outputs an
ignition signal. At this time, if the side-airbag safing G-sensor is on, the
curtain air bag module will deploy.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set if
curtain air bag module squib (RH) wire(s) are open-circuited.
PROBABLE CAUSES
- Improper connector contact
- Open circuit in the curtain air bag module (squib) (RH) circuit
- 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 curtain air bag module (RH) (M.U.T.-III diagnosis
code).
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(1)Disconnect the negative battery terminal.
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![](../../../img/52/AC302575AD00ENG.png)
![](../../../img/52/AC208384AM00ENG.png)
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(2)Disconnect curtain air bag module (RH)
connector G-04. Use a flat-tipped screwdriver to unlock the locking button
at the harness side connector by withdrawing it toward you in two stages,
and then disconnect the connector.
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![](../../../img/52/AC301553AI00ENG.png)
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(3)Connect special tool dummy resistor
(MB991865) to special tool resistor harness (MB991884). (4)Connect
special tool MB991884 to the G-04 harness side connector. (5)Connect the
negative battery terminal. (6)Erase diagnosis code memory, and then
check the diagnosis code.
Q.
Is diagnosis code B1441 set?
Go to Step 4.
Replace the curtain air bag module
(RH) (Refer to ).
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STEP 4. Resistance measurement between SRS-ECU connector C-118
(terminal No.61 and 62) and the curtain air bag module (RH) connector G-04
(terminal No.1 and 2)
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![](../../../img/52/AC311438AC00ENG.png)
![](../../../img/52/AC302575AD00ENG.png)
![](../../../img/52/AC208384AM00ENG.png)
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(1)Disconnect SRS-ECU connector C-118 and
curtain air bag module (RH) connector G-04, and measure at the wiring
harness side. For connector G-04, use a flat-tipped screwdriver to unlock
the locking button at the harness side connector by withdrawing it toward
you in two stages, and then disconnect the connector.
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![](../../../img/52/AC201287BI00ENG.png)
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(2)Connect G-04 harness side connector to
special tool resistor harness (MB991884).
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![](../../../img/52/AC301555AC00ENG.png)
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(3)
caution |
Do not insert a test probe into the terminal from
its front side directly as the connector contact pressure may be
weakened.
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Resistance measurement between the following terminals.
- SRS-ECU connector C-118 terminal No.62 and special tool terminal
No.1
- SRS-ECU connector C-118 terminal No.61 and special tool terminal
No.2
OK: Less than 2 Ω
Q.
Are the check results normal?
Go to Step 5.
Repair the harness wire between
SRS-ECU connector C-118 (terminal No.61and 62) and curtain air bag module
(RH) connector G-04 (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 No.B1441 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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