Dtc B Front Occupant Classification Sensor Lh Circuit Malfunction Description

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The occupant classification sensor front LH circuit consists of the occupant classification ECU and the occupant classification sensor front LH.

DTC B1780 is recorded when a malfunction is detected in the occupant classification sensor front LH circuit. DIAGNOSTIC TROUBLE CODE CHART

2006 RESTRAINTS Supplemental Restraint System - Sequoia

DTC No.

DTC Detecting Condition

Trouble Area

B178G

• The occupant classification ECU receives a line short circuit signal, an open circuit signal, a short circuit to ground signal or a short circuit to B+ signal in the occupant classification sensor front LH circuit for 2 seconds.

• Occupant classification sensor front LH malfunction

• Occupant classification ECU malfunction

• Front seat assembly RH

• (Occupant classification sensor front LH)

• Occupant classification ECU

• Seat wire No. 1

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 B1780 is output, perform troubleshooting for the DTC.

WIRING DIAGRAM

Occupant Classification Sensor Front LH

Occupant Classification ECU

Occupant Classification Sensor Front LH

SGD1

0

3

V

SIG1

G

2

\

SVC1

V

!

SIG1

SVC1

Fig. 157: Front Occupant Classification Sensor LH Circuit Malfunction - Wiring Diagram Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

2006 RESTRAINTS Supplemental Restraint System - Sequoia

HINT:

• If troubleshooting (wire harness inspection) is difficult to perform, remove the passenger seat installation bolts to see the under surface of seat cushion.

• In the above case, hold the seat so that it does not fall down. Holding the seat for a long period of time may cause a problem, such as seat rail deformation. Hold the seat only as necessary.

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