Code No.B1462:
Seat Belt Pre-Tensioner (RH) (Squib) System Fault for Earth Circuit
(Short-Circuit to Earth)
![](../../../img/52/W4X52E018A00ENG.png)
caution |
If diagnosis code B1462 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 front impact
sensors and the front air bag analogue G-sensor. If the impact is over a
predetermined level,
the SRS-ECU sends an ignition signal. At this time, if the front air bag
safing G-sensor is
on, the pre-tensioner will deploy.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set if there
is abnormal resistance between the input terminals
of the seat belt pre-tensioner (RH) (squib).
PROBABLE CAUSES
- Damaged wiring harnesses or connectors
- Short to the earth in the seat belt pre-tensioner (RH) (squib)
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 seat belt pre-tensioner (RH) (M.U.T.-III diagnosis
code).
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(1)Disconnect the negative battery terminal.
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![](../../../img/52/AC302394AC00ENG.png)
![](../../../img/52/AC103556AX00ENG.png)
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(2)Disconnect seat belt pre-tensioner (RH)
connector D-32. 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/AC103283AU00ENG.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 D-32 harness side connector. (5)Connect the
negative battery terminal. (6)Erase diagnosis code memory, and then
check the diagnosis code.
Q.
Is diagnosis code B1462 set?
Go to Step 4 .
Replace the seat belt pre-tensioner
(RH) (Refer to ).
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STEP 4. Check the seat belt pre-tensioner (RH) circuit. Resistance
measurement at the SRS-ECU connector C-118.
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![](../../../img/52/AC311438AC00ENG.png)
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(1)Disconnect SRS-ECU connector C-118.
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![](../../../img/52/AC302394AC00ENG.png)
![](../../../img/52/AC103556AX00ENG.png)
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(2)Disconnect seat belt pre-tensioner (RH)
connector D-32. 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/AC301572AG00ENG.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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Check for continuity between C-118 harness side connector terminals
59, 60 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. 59 and 60)
and seat belt pre-tensioner (RH) connector D-32 (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 B1462 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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