Toyota Sequoia (2005). Manual - part 526

I18627

B11

B10

–

DIAGNOSTICS

MULTIPLEX COMMUNICATION SYSTEM

DI–1899

2093

5.

CHECK BACK DOOR ECU

(a)

Disconnect the B10 and B11 ECU connectors.

(b)

Measure the resistance or voltage of each terminal of the wire harness side connector.
Standard:

Symbols (Terminals No.)

Wiring Color

Terminal Description

Condition

Specified Condition

MPX2 (B11–1) – Body ground

B – Body ground

MPX line

Always

10 k

Ω

 or higher

MPX1 (B11–2) – Body ground

LG–R – 

Body ground

MPX line

Always

10 k

Ω

 or higher

GND (B11–3) – Body ground

W–B – 

Body ground

Ground

Always

Below 1 

Ω

BDR (B11–4) – Body ground

L–W – 

Body ground

+B (BATT) power supply

Always

10 to 14 V

BECU (B11–5) – Body ground

W–R – 

Body ground

+B (BATT) power supply

Always

10 to 14 V

SIG (B11–6) – Body ground

B–R – 

Body ground

Ignition power supply

Ignition switch ON

10 to 14 V

If the result is not as specified, there may be a malfunction on the wire harness side.

I27703

C5

C6

DI–1900

–

DIAGNOSTICS

MULTIPLEX COMMUNICATION SYSTEM

2094

6.

CHECK COMBINATION METER

(a)

Disconnect the C5 and C6 meter connectors.

(b)

Measure the resistance or voltage of each terminal of the wire harness side connector.
Standard:

Terminals No.

Wiring Color

Terminal Description

Condition

Specified Condition

C6–24 – Body ground

B–O – 

Body ground

Ignition power supply

Ignition switch ON

10 to 14 V

C6–23 – Body ground

W–R – 

Body ground

+B (BATT) power supply

Always

10 to 14 V

C5–30 – Body ground

W – Body ground

MPX line

Always

10 k

Ω

 or higher

C5–31 – Body ground

LG–R – 

Body ground

MPX line

Always

10 k

Ω

 or higher

C5–32 – Body ground

LG–B – 

Body ground

MPX line

Always

10 k

Ω

 or higher

C6–12 – Body ground

BR – 

Body ground

Ground

Always

Below 1 

Ω

C5–28 – Body ground

B–R – 

Body ground

Ignition power supply

Ignition switch ON

10 to 14 V

If the result is not as specified, there may be a malfunction on the wire harness side.

I27716

M7

M6

–

DIAGNOSTICS

MULTIPLEX COMMUNICATION SYSTEM

DI–1901

2095

7.

CHECK MEMORY SEAT ECU & SWITCH (w/ Driving Position Memory)

(a)

Disconnect the M6 and M7 ECU connectors.

(b)

Measure the resistance or voltage of each terminal of the wire harness side connector.
Standard:

Symbols (Terminals No.)

Wiring Color

Terminal Description

Condition

Specified Condition

MPX1 (M6–1) – Body ground

W – Body ground

MPX line

Always

10 k

Ω

 or higher

IG (M6–4) – Body ground

B–R – 

Body ground

Ignition power supply

Ignition switch ON

10 to 14 V

SYSB (M6–8) – Body ground

W–R – 

Body ground

+B (BATT) power supply

Always

10 to 14 V

GND (M7–1) – Body ground

W–B – 

Body ground

Ground

Always

Below 1 

Ω

+B (M7–5) – Body ground

L–O – 

Body ground

+B (BATT) power supply

Always

10 to 14 V

If the result is not as specified, there may be a malfunction on the wire harness side.

I15876

I19

I20

I21

I22

DI–1902

–

DIAGNOSTICS

MULTIPLEX COMMUNICATION SYSTEM

2096

8.

CHECK A/C ECU (INTEGRATION CONTROL AND PANEL)

(a)

Disconnect the I19 ECU connector.

(b)

Measure the resistance or voltage of each terminal of the wire harness side connector.
Standard:

Symbols (Terminals No.)

Wiring Color

Terminal Description

Condition

Specified Condition

+B (I19–1) – Body ground

R – Body ground

+B (BATT) power supply

Always

10 to 14 V

IG+ (I19–2) – Body ground

R–L – 

Body ground

Ignition power supply

Ignition switch ON

10 to 14 V

ACC (I19–11) – Body ground

P – Body ground

ACC power supply

Ignition switch ACC

10 to 14 V

MPX+ (I19–3) – Body ground

L–Y – 

Body ground

MPX line

Always

10 k

Ω

 or higher

MPX– (I19–13) – Body ground

LG–B – 

Body ground

MPX line

Always

10 k

Ω

 or higher

GND (I19–10) – Body ground

O – Body ground

Ground

Always

Below 1 

Ω

If the result is not as specified, there may be a malfunction on the wire harness side.