Code No.B1442: Curtain air bag module (squib) (RH) system (short-circuited
to the earth)
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If diagnosis code B1442 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 the
curtain air bag module squib (RH) wire(s) are short-circuited to the
earth.
PROBABLE CAUSES
- Damaged wiring harnesses or connectors
- Short to the earth in the curtain air bag module (squib) (RH)
harness
- 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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(2)Disconnect curtain air bag module 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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(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 check
the diagnosis code.
Q.
Is diagnosis code B1442 set?
Go to Step 4 .
Replace the curtain air bag module
(RH) (Refer to ).
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STEP 4. Check the curtain air bag module (RH) circuit. Resistance
measurement at the SRS-ECU connector C-118.
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(1)Disconnect SRS-ECU connector C-118.
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(2)Disconnect curtain air bag module 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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(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 C-118 harness side connector
terminals 61, 62 and body earth.
OK: Open
circuit
Q.
Is the check result 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 B1442 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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