Last Modified: 11-29-2007 1.6 U
Service Category: Vehicle Interior Section: Seat Belt
Model Year: 2008 Model: Sequoia Doc ID: RM000002ZFA003X
Title: SEAT BELT: SEAT BELT WARNING SYSTEM: TERMINALS OF ECU (2008 Sequoia)

TERMINALS OF ECU

1. CHECK COMBINATION METER (METER ECU)



(a) Measure the resistance and voltage according to the value(s) in the table below.

Standard

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

H37-18 (B) - Body ground

LG - Body ground

Power source

Always

11 to 14 V

H37-15 (P/SB) - Body ground

L - Body ground

Front passenger side seat belt warning light signal

Front passenger side seat is occupied, seat belt is fastened

Below 1 V

Front passenger side seat is occupied, seat belt is unfastened

Alternating between 11 to 14 V and below 1 V

H37-31 (TX+) - Body ground

Y - Body ground

Accessory meter input signal

Ignition switch ON

Local communication signal

H37-33 (CANH) - H37-34 (CANL)

SB - W

Driver side seat belt warning light signal (CAN signal)

Ignition switch off

108 to 132 Ω

H37-33 (CANH) - H37-40 (E1)

SB - W-B

Driver side seat belt warning light signal (CAN signal)

Ignition switch off

200 Ω or higher

H37-34 (CANL) - H37-40 (E1)

W - W-B

Driver side seat belt warning light signal (CAN signal)

Ignition switch off

200 Ω or higher

H37-40 (E1) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

If the result is not as specified, the ECU may have a malfunction.

2. CHECK INTEGRATION CONTROL AND PANEL



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

Standard Voltage

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

H45-16 (IG+) - Body ground

P - Body ground

Power source

Always

11 to 14 V

H45-14 (PBEW) - Body ground

L - Body ground

Front passenger side seat belt warning light signal

Front passenger side seat is occupied, seat belt is fastened

Below 1 V

Front passenger side seat is occupied, seat belt is unfastened

Alternating between 11 to 14 V and below 1 V

If the result is not as specified, the panel may have a malfunction.

3. CENTER AIRBAG SENSOR



Terminal No.

Terminal Symbol

Destination

H56-13

CANH

Combination meter

(Meter ECU)

H56-22

CANL

Combination meter

(Meter ECU)

O1-11

DBE+

Front seat inner belt LH (Seat belt buckle switch LH)

O1-12

DBE-

Front seat inner belt LH (Seat belt buckle switch LH)

P1-12

FSP+

Occupant classification ECU

P1-13

FSP-

Occupant classification ECU

4. CHECK OCCUPANT CLASSIFICATION ECU



(a) Measure the voltage and resistance according to the value(s) in the table below.

Standard: (w/ Power Seat)

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

W6-1 (+B) - Body ground

G - Body ground

Power source

Always

11 to 14 V

W6-7 (IG) - Body ground

SB - Body ground

Occupant classification ECU +B line

Ignition switch ON

11 to 14 V

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

B - W

Pressure sensor signal line

Ignition switch ON

Below 1 to 5 V

W6-9 (BSW) - W6-5 (BGND)

L - O

Passenger side buckle switch line

Ignition switch ON

Pulse generation

W6-3 (GND) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

Standard: (w/o Power Seat)

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

P14-1 (+B) - Body ground

R - Body ground

Power source

Always

11 to 14 V

P14-7 (IG) - Body ground

SB - Body ground

Occupant classification ECU +B line

Ignition switch ON

11 to 14 V

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

B - W

Pressure sensor signal line

Ignition switch ON

Below 1 to 5 V

P14-9 (BSW) - P14-5 (BGND)

L - O

Passenger side buckle switch line

Ignition switch ON

Pulse generation

P14-3 (GND) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

If the result is not as specified, the ECU may have a malfunction.