Toyota Sequoia (2005). Manual - part 335

H22556

O6

O7

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–1135

1329

2.

OCCUPANT CLASSIFICATION ECU

Terminal No. (Symbols)

Wiring Color

Terminal Description

Condition

Specification

O6–1 (+B) – 

O6–3 (GND)

W–R – W–B

Battery

Ignition switch ON

10 to 14 V

O6–2 (DIA) – 

O6–3 (GND)

G–R – W–B

Diagnosis (DLC3)

Ignition switch ON

Pulse generation

O6–3 (GND) – 

Body ground

W–B – Body ground

Ground

Always

Below 1 V

O6–4 (FSR–) – 

O6–3 (GND)

B – W–B

Airbag sensor assy center
communication line (–)

Always

Below 1 V

O6–5 (BGND) – 

O6–3 (GND)

L – W–B

Passenger side buckle
switch ground line

Always

Below 1 V

O6–7 (IG) – O6–3 (GND)

B–O – W–B

Power source (IGN1 Fuse)

Ignition switch ON

10 to 14 V

O6–8 (FSR+) – 

O6–4 (FSR–)

W – B

Airbag sensor assy center
communication line

Ignition switch ON

Pulse generation

O6–9 (BSW) – 

O6–5 (BGND)

R – L

Passenger side buckle
switch line

Always

Pulse generation

O7–1 (SGD1) – 

O6–3 (GND)

O – W–B

Occupant classification
sensor front LH ground line

Always

Below 1 V

O7–2 (SGD2) – 

O6–3 (GND)

B–Y – W–B

Occupant classification
sensor front RH ground
line

Always

Below 1 V

O7–3 (SGD3) – 

O6–3 (GND)

R–B – W–B

Occupant classification
sensor rear LH ground line

Always

Below 1 V

O7–4 (SGD4) – 

O6–3 (GND)

R–W – W–B

Occupant classification
sensor rear RH ground line

Always

Below 1 V

O7–5 (SVC3) – 

O7–3 (SGD3)

Y–B – R–B

Occupant classification
sensor rear LH power sup-
ply line

Ignition switch ON, a load
is applied to occupant clas-
sification sensor rear LH

4.5 to 5.1 V

O7–6 (SVC4) – 

O7–4 (SGD4)

Y – R–W

Occupant classification
sensor rear RH power sup-
ply line

Ignition switch ON, a load
is applied to occupant clas-
sification sensor rear RH

4.5 to 5.1 V

O7–7 (SIG1) – 

O7–1 (SGD1)

G – O

Occupant classification
sensor front LH signal line

Ignition switch ON, a load
is applied to occupant clas-
sification sensor front LH

0.2 to 4.9 V

O7–8 (SIG2) – 

O7–2 (SGD2)

LG – B–Y

Occupant classification
sensor front RH signal line

Ignition switch ON, a load
is applied to occupant clas-
sification sensor front RH

0.2 to 4.9 V

O7–9 (SIG3) – 

O7–3 (SGD3)

G–B – R–B

Occupant classification
sensor rear LH signal line

Ignition switch ON, a load
is applied to occupant clas-
sification sensor rear LH

0.2 to 4.9 V

O7–10 (SIG4) – 

O7–4 (SGD4)

L–W – R–W

Occupant classification
sensor rear RH signal line

Ignition switch ON, a load
is applied to occupant clas-
sification sensor rear RH

0.2 to 4.9 V

DI–1136

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

1330

O7–11 (SVC1) – 

O7–1 (SGD1)

V – O

Occupant classification
sensor front LH power sup-
ply line

Ignition switch ON, a load
is applied to occupant clas-
sification sensor front LH

4.5 to 5.1 V

O7–12 (SVC2) – 

O7–2 (SGD2)

P – B–Y

Occupant classification
sensor front RH power
supply line

Ignition switch ON, a load
is applied to occupant clas-
sification sensor front RH

4.5 to 5.1 V

DIDGM–01

A04550

13

9

14

10

15

11

16

12

5

1

6

2

7

3

8

4

DLC3

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–1137

1331

DIAGNOSIS SYSTEM

1.

CHECK DLC3

The vehicle’s ECM uses ISO 14230 for communication. The ter-
minal arrangement of the DLC3 complies with SAE J1962 and
matches the ISO 14230 format.

Terminal No.

Connection/Voltage or Resistance

Condition

7

Bus 

 Line/Pulse generation

During Transmission

4

Chassis Ground 

↔

 Body Ground/Below 1 

Ω

Always

16

Battery Positive 

↔

 Body Ground/10 to 14 V

Always

HINT:
If the display shows UNABLE TO CONNECT TO VEHICLE
when you have connected the cable of the OBD II scan tool or
hand–held tester to the DLC3, turned the ignition switch ON
and operated the scan tool, there is a problem on the vehicle
side or tool side.

If communication is normal when the tool is con-
nected to another vehicle, inspect the DLC3 on the
original vehicle.

If communication is still not possible when the tool
is connected to another vehicle, the problem is
probably in the tool itself, so consult the Service De-
partment listed in the tool’s instruction manual.

H22553

Vibrate Slightly

Shake Slightly

Vibrate Slightly

DI–1138

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

1332

2.

SYMPTOM SIMULATION

HINT:
The most difficult case in troubleshooting is when no symptoms
occur. In such cases, a thorough customer problem analysis
must be carried out. Then the same or similar conditions and
environment in which the problem occurred in the customer’s
vehicle should be simulated. No matter how experienced or
skilled a technician may be, if he proceeds to troubleshoot with-
out confirming the problem symptoms, he will likely overlook
something important and make a wrong guess at some points
in the repair operation. This leads to a standstill in troubleshoot-
ing.
(a)

Vibration method: When vibration seems to be the major
cause.

HINT:
Perform the simulation method only during the primary check
period (for approximately 6 seconds after the ignition switch is
turned to the ON position).

(1)

Slightly vibrate the part of the sensor considered to
be the problem cause with your fingers and check
whether the malfunction occurs.

HINT:
Shaking the relays too strongly may result in open relays.

(2)

Slightly shake the connector vertically and horizon-
tally.

(3)

Slightly shake the wire harness vertically and hori-
zontally.
The connector joint and fulcrum of the vibration are
the major areas to be checked thoroughly.

(b)

Simulation method for DTC B1794: Turn the ignition
switch from the LOCK to ON, hold for 10 seconds, and
back to LOCK again 50 times in a row.

HINT:
DTC B1794 is output if the occupant classification ECU re-
ceives the ignition switch LOCK–ON–LOCK signal 50 times in
a row when a malfunction occurs in the power circuit for the oc-
cupant classification system.