Code No.B1460:
Seat Belt Pre-Tensioner (RH) (Squib) System Fault 1 (Short Circuit
between Terminals of the
Squib Circuit)
![](../../../img/52/W4X52E018A00ENG.png)
caution |
If diagnosis code B1460 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
- Improper engaged connector or defective short
spring*
- Short circuit between the seat belt pre-tensioner (RH) (squib)
circuit terminals
- Damaged connector(s)
- Malfunction of the SRS-ECU
note |
*: The squib circuit connectors
integrate a "short" spring (which prevents the
seat belt pre-tensioner from deploying unintentionally due
to static electricity by shorting
the positive wire to the earth wire in the squib circuit
when the connectors are disconnected)
(Refer to ).
Therefore, if connector C-118 or D-32 is damaged
or improperly engaged, the short spring may not be released
when the connector is connected.
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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. M.U.T.-III diagnosis code
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caution |
To prevent damage to
M.U.T.-III MB991958, always turn the ignition
switch to
the "LOCK" (OFF) position before connecting or
disconnecting M.U.T.-III MB991958.
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(1)Turn the ignition switch to the "ON"
position.
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(2)Check if the diagnosis code is set.
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(3)Turn the ignition switch to the "LOOK (OFF)"
position.
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Q.
Is diagnosis code B1519 set?
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Go to Step 4
.
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Go to Step 5
.
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STEP 4. Connector lock check: SRS-ECU connector C-118
(M.U.T.-III diagnosis
code).
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(1)Disconnect the negative battery
terminal.
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![](../../../img/52/AC311438AC00ENG.png)
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(2)Disconnect the connectors C-118
and then reconnect them. (3)Connect the negative battery
terminal. (4)Erase the diagnosis code memory, and check
the diagnosis code.
Q.
Is diagnosis code B1460 set?
Go to Step 5
.
The
procedure is complete. It is assumed that diagnosis code
B1460 set as connector
C-118 was engaged improperly.
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STEP 5. Connector lock check: SRS-ECU connector C-118
and seat belt
pre-tensioner (RH) connector D-32 (M.U.T.-III diagnosis
code).
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(1)Disconnect the negative battery
terminal.
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![](../../../img/52/AC311438AC00ENG.png)
![](../../../img/52/AC302394AC00ENG.png)
![](../../../img/52/AC103556AX00ENG.png)
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(2)Disconnect connectors C-118 and
D-32, and then reconnect them. For 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. (3)Connect the negative battery
terminal. (4)Erase the diagnosis code memory, and check
the diagnosis code.
Q.
Is diagnosis code B1460 set?
Go to Step 6
.
The
procedure is complete. It is assumed that diagnosis code
B1460 set as connector
C-118 or D-32 was engaged improperly.
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STEP 6. 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 B1460 set?
Go to Step 7
.
Replace the
seat belt pre-tensioner (RH) (Refer to ).
Then go to Step 8 .
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STEP 7. Check the passenger’s seat belt
pre-tensioner 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)
danger |
To prevent the seat belt
pre-tensioner from deploying unintentionally,
disconnect the
seat belt pre-tensioner (RH) connector D-32 to
short the squib circuit.
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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/AC301608AG00ENG.png)
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(3)
caution |
Insert an insulator such as a
cable tie to a depth of 4mm or more, otherwise
the short
spring will not be released.
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Insert a cable tie [3 mm wide, 0.5 mm
thick]
between terminals 59, 60
and the short spring to release the short spring.
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![](../../../img/52/AC301572AG00ENG.png)
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(4)
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 and 60. OK: Open
circuit.
Q.
Is the check result normal?
Go to Step 8
.
Repair the
harness wires 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 8. Check whether the diagnosis code is
reset.
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Q.
Is diagnosis code B1460 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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