Last Modified: 11-29-2007 1.6 C
Service Category: Vehicle Interior Section: Supplemental Restraint Systems
Model Year: 2008 Model: Sequoia Doc ID: RM0000016WN01HX
Title: SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: DESCRIPTION (2008 Sequoia)

DTC

B1650/32

Occupant Classification System Malfunction

DESCRIPTION

The occupant classification system circuit consists of the center airbag sensor and the occupant classification system.

If the center airbag sensor receives signals from the occupant classification ECU, it determines whether the front passenger airbag, the front seat side airbag RH and front seat outer belt should be operated.

DTC B1650/32 is stored when a malfunction is detected in the occupant classification system circuit.

DTC Code

Detection Condition

Trouble Area

B1650/32

When one of following conditions is met:

  • Occupant classification system malfunction
  • The center airbag sensor 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 system circuit for 2 seconds.
  • Center airbag sensor malfunction
  • No. 2 Floor wire
  • Front seat wire RH (w/ power seat)
  • Occupant classification system
  • Center airbag sensor assembly

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1.

CHECK FOR DTC (OCCUPANT CLASSIFICATION ECU)

(a) Turn the ignition switch to ON, and wait for at least 10 seconds.

(b) Check for the DTCs of the occupant classification ECU SUPPLEMENTAL RESTRAINT SYSTEMS: OCCUPANT CLASSIFICATION SYSTEM: DTC CHECK / CLEAR (2008 Sequoia) .

OK:

DTC is not output.

OK

2.

CHECK VEHICLE SYSTEM

(a) Check vehicle system.

Result

Result

Proceed to

w/ Power seat

A

w/o Power seat

B
A

3.

CHECK FOR DTC (CENTER AIRBAG SENSOR)

(a) Turn the ignition switch to ON, and wait for at least 60 seconds.

(b) Clear the DTCs SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: DTC CHECK / CLEAR (2008 Sequoia) .

(c) Turn the ignition switch off.

(d) Turn the ignition switch to ON, and wait for at least 60 seconds.

(e) Check for DTCs SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: DTC CHECK / CLEAR (2008 Sequoia) .

OK:

DTC B1650/32 is not output.

HINT:

Codes other than DTC B1650/32 may be output at this time, but they are not related to this check.

OK

5.

CHECK CONNECTION OF CONNECTORS

(a) Turn the ignition switch off.

(b) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

(c) Check that the connectors are properly connected to the center airbag sensor and the occupant classification ECU.

OK:

The connectors are properly connected.

OK

6.

CHECK CONNECTORS

(a) Disconnect the connectors from the center airbag sensor and the occupant classification ECU.

(b) Check that the connectors (on the center airbag sensor side and occupant classification ECU side) are not damaged INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: ELECTRONIC CIRCUIT INSPECTION PROCEDURE (2008 Sequoia) .

OK:

The connectors are not deformed or damaged.

OK

7.

CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT

(a) Using a service wire, connect terminals 12 (FSP+) and 13 (FSP-) of connector B.



NOTICE:

Do not forcibly insert a service wire into the terminals of the connector when connecting the wire.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

W6-8 (FSR+) - W6-4 (FSR-)

Always

Below 1 Ω

(c) Disconnect the service wire from connector B.

(d) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

W6-8 (FSR+) - W6-4 (FSR-)

Always

1 MΩ or higher

W6-8 (FSR+) - Body ground

Always

1 MΩ or higher

W6-4 (FSR-) - Body ground

Always

1 MΩ or higher

(e) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

(f) Turn the ignition switch to ON.

(g) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

W6-8 (FSR+) - Body ground

Ignition switch ON

Below 1 V

W6-4 (FSR-) - Body ground

Ignition switch ON

Below 1 V
OK

8.

CHECK NO. 2 FLOOR WIRE

(a) Turn the ignition switch off.



(b) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

(c) Disconnect the front seat wire RH connector from the No. 2 floor wire.

(d) Using a service wire, connect terminal 12 (FSP+) and 13 (FSP-) of connector B.

(e) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

PW1-8 (FSR+) - PW1-9 (FSR-)

Always

Below 1 Ω

(f) Disconnect the service wire from connector B.

(g) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

PW1-8 (FSR+) - PW1-9 (FSR-)

Always

1 MΩ or higher

PW1-8 (FSR+) - Body ground

Always

1 MΩ or higher

PW1-9 (FSR-) - Body ground

Always

1 MΩ or higher

(h) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

(i) Turn the ignition switch to ON.

(j) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

PW1-8 (FSR+) - Body ground

Ignition switch ON

Below 1 V

PW1-9 (FSR-) - Body ground

Ignition switch ON

Below 1 V
OK

10.

CHECK FOR DTC (CENTER AIRBAG SENSOR)

(a) Turn the ignition switch to ON, and wait for at least 60 seconds.

(b) Clear the DTCs SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: DTC CHECK / CLEAR (2008 Sequoia) .

(c) Turn the ignition switch off.

(d) Turn the ignition switch to ON, and wait for at least 60 seconds.

(e) Check for DTCs SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: DTC CHECK / CLEAR (2008 Sequoia) .

OK:

DTC B1650/32 is not output.

HINT:

Codes other than DTC B1650/32 may be output at this time, but they are not related to this check.

OK

11.

CHECK CONNECTION OF CONNECTORS

(a) Turn the ignition switch off.

(b) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

(c) Check that the connectors are properly connected to the center airbag sensor and the occupant classification ECU.

OK:

The connectors are properly connected.

OK

12.

CHECK CONNECTORS

(a) Disconnect the connectors from the center airbag sensor and the occupant classification ECU.

(b) Check that the connectors (on the center airbag sensor side and occupant classification ECU side) are not damaged INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: ELECTRONIC CIRCUIT INSPECTION PROCEDURE (2008 Sequoia) .

OK:

The connectors are not deformed or damaged.

OK

13.

CHECK NO. 2 FLOOR WIRE (CENTER AIRBAG SENSOR - OCCUPANT CLASSIFICATION ECU)

(a) Using a service wire, connect terminals 12 (FSP+) and 13 (FSP-) of connector B.



NOTICE:

Do not forcibly insert a service wire into the terminals of the connector when connecting the wire.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

P14-8 (FSR+) - P14-4 (FSR-)

Always

Below 1 Ω

(c) Disconnect the service wire from connector B.

(d) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

P14-8 (FSR+) - P14-4 (FSR-)

Always

1 MΩ or higher

P14-8 (FSR+) - Body ground

Always

1 MΩ or higher

P14-4 (FSR-) - Body ground

Always

1 MΩ or higher

(e) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

(f) Turn the ignition switch to ON.

(g) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

P14-8 (FSR+) - Body ground

Ignition switch ON

Below 1 V

P14-4 (FSR-) - Body ground

Ignition switch ON

Below 1 V
OK