Toyota Sequoia (2005). Manual — part 380
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI–1315
1509
DTC
B1788
Occupant Classification Sensor Rear RH
Collision Detection
CIRCUIT DESCRIPTION
DTC B1788 is output when the occupant classification ECU receives a collision detection signal sent by the
occupant classification sensor rear RH if an accident occurs.
DTC B1788 is also output when the front seat assembly RH is subjected to a strong impact, even if an actual
accident does not occur.
However, when the occupant classification ECU outputs a collision detection signal, even if the vehicle is
not in a collision, DTC B1788 can be cleared by ”Zero point calibration” and ”Sensitivity check”.
Therefore, if DTC B1788 is output, first perform ”Zero point calibration” and ”Sensitivity check”.
DTC No.
DTC Detecting Condition
Trouble Area
B1788
Front seat assembly RH malfunction
Occupant classification ECU malfunction
Occupant classification sensor rear RH detects heavy
load.
Front seat assembly RH
(Occupant classification sensor rear RH)
Occupant classification ECU
HINT:
When DTC B1650/32 is detected as a result of troubleshooting for the supplemental restraint system, check
the DTCs stored in the occupant classification ECU. When DTC B1788 is output, perform troubleshooting
for the DTC.
WIRING DIAGRAM
See page
INSPECTION PROCEDURE
1
Perform zero point calibration.
(a)
Connect the hand–held tester to the DLC3.
(b)
Turn the ignition switch to the ON position.
(c)
Using the hand–held tester, perform ”Zero point calibration” (see page
).
OK:
The ”COMPLETED” is displayed.
NG
OK
DIDHC–01
DI–1316
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
1510
2
Perform sensitivity check.
Using the hand–held tester, perform ”Sensitivity check” (see page
OK:
Standard value: 27 to 33 kg (59.52 to 72.75 lb)
NG
OK
3
Check DTC.
CHECK:
(a)
Turn the ignition switch to the ON position.
(b)
Clear the DTCs stored in memory (see page
).
HINT:
First clear DTCs stored in the occupant classification ECU and then in the airbag sensor assembly.
(c)
Turn the ignition switch to the LOCK position.
(d)
Turn the ignition switch to the ON position.
(e)
Using the hand–held tester, check the DTCs of the occupant classification ECU (see page
OK:
DTC B1788 is not output.
HINT:
Codes other than DTC B1788 may be output at this time, but they are not related to this check.
NG
OK
END
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DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI–1317
1511
4
Replace front seat assembly RH.
(a)
Turn the ignition switch to the LOCK position.
(b)
Disconnect the negative (–) terminal cable from the battery, and wait for at least 90 seconds.
(c)
Replace the front seat assembly RH (see page
HINT:
Perform the inspection using parts from a normal vehicle if possible.
NEXT
5
Perform zero point calibration.
(a)
Connect the negative (–) terminal cable to the battery.
(b)
Connect the hand–held tester to the DLC3.
(c)
Turn the ignition switch to the ON position.
(d)
Using the hand–held tester, perform ”Zero point calibration” (see page
).
OK:
The ”COMPLETED” is displayed.
NG
OK
6
Perform sensitivity check.
Using the hand–held tester, perform ”Sensitivity check” (see page
OK:
Standard value: 27 to 33 kg (59.52 to 72.75 lb)
NG
OK
DI–1318
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
1512
7
Check DTC.
CHECK:
(a)
Turn the ignition switch to the ON position.
(b)
Clear the DTCs stored in memory (see page
).
HINT:
First clear DTCs stored in the occupant classification ECU and then in the airbag sensor assembly.
(c)
Turn the ignition switch to the LOCK position.
(d)
Turn the ignition switch to the ON position.
(e)
Using the hand–held tester, check the DTCs of the occupant classification ECU (see page
OK:
DTC B1788 is not output.
HINT:
Codes other than DTC B1788 may be output at this time, but they are not related to this check.
NG
OK
END
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