Toyota Sequoia (2005). Manual - part 531

–

DIAGNOSTICS

MULTIPLEX COMMUNICATION SYSTEM

DI–1919

2113

8

Check for a short circuit between the front passenger door ECU and back door
ECU.

PREPARATION:
Disconnect connector ”F18” of the front passenger door ECU.
CHECK:
Check the DTC (See page 

DI–1904

).

OK:

DTCs B1214 and/or B1215 are not indicated.

HINT:
Ignore any codes other than DTCs B1214 and B1215.

OK

Repair or replace the wire harness between the
front passenger door ECU and back door ECU.

NG

9

Check the communication circuit inside the integration control and panel.

PREPARATION:
(a)

Reconnect connector ”F18” of the passenger door ECU.

(b)

Reconnect connector ”B11” of the back door ECU.

(c)

Disconnect connector ”I19” of the integration control and panel.

CHECK:
Check the DTC (See page 

DI–1904

).

OK:

DTCs B1214 and/or B1215 are not indicated.

HINT:
Ignore any codes other than DTCs B1214 and B1215.

OK

Replace the integration control and panel.

NG

DI–1920

–

DIAGNOSTICS

MULTIPLEX COMMUNICATION SYSTEM

2114

10

Check for a short circuit between the integration control and the panel and the
body ECU.

PREPARATION:
Disconnect connector ”B5” of the body ECU.
CHECK:
Check the DTC (See page 

DI–1904

).

OK:

DTCs B1214 and/or B1215 are not indicated.

HINT:
Ignore any codes other than DTCs B1214 and B1215.

OK

Repair or replace the wire harness between the
integration control and panel and the body ECU.

NG

11

Check apparatus.

CHECK:
Choose the apparatus to be inspected.

Apparatus

Go to step

w/ Driving position memory

A

w/o Driving position memory

B

B

Go to step 14.

A

–

DIAGNOSTICS

MULTIPLEX COMMUNICATION SYSTEM

DI–1921

2115

12

Check the communication circuit inside the memory seat ECU & switch.

PREPARATION:
(a)

Reconnect connector ”I19” of the integration control and panel.

(b)

Reconnect connector ”B5” of the body ECU.

(c)

Disconnect connector ”M6” of the memory seat ECU & switch.

CHECK:
Check the DTC (See page 

DI–1904

).

OK:

DTCs B1214 and/or B1215 are not indicated.

HINT:
Ignore any codes other than DTCs B1214 and B1215.

OK

Replace the memory seat ECU & switch.

NG

13

Check for a short circuit between the memory seat ECU and switch & combina-
tion meter.

PREPARATION:
Disconnect connector ”C5” of the combination meter.
CHECK:
Measure the resistance according to the value(s) in the table below.
OK:

Symbols (Tester connection)

Condition

Specified condition

MPX1 (M6–1) – Body ground

Always

10 k

Ω 

or higher

NG

Repair or replace the wire harness between the
memory seat ECU & switch and combination
meter.

OK

DI–1922

–

DIAGNOSTICS

MULTIPLEX COMMUNICATION SYSTEM

2116

14

Check the communication circuit inside the combination meter ECU.

PREPARATION:
(a)

Reconnect connector ”M6” of the memory seat ECU & switch (only vehicles w/ driving position
memory).

(b)

Reconnect connector ”I19” of the integration control and panel (only vehicles w/o driving position
memory).

(c)

Reconnect connector ”B5” of the body ECU (only vehicles w/o driving position memory).

(d)

Disconnect connector ”C5” of the combination meter ECU (only vehicles w/o driving position memory).

CHECK:
Check the DTC (See page 

DI–1904

).

OK:

DTCs B1214 and/or B1215 are not indicated.

HINT:
Ignore any codes other than DTCs B1214 and B1215.

OK

Replace the combination meter ECU.

NG

15

Check for a short circuit between the combination meter ECU and back door
ECU.

PREPARATION:
Disconnect connector ”B11” of the back door ECU.
CHECK:
Check the DTC (See page 

DI–1904

).

OK:

DTCs B1214 and/or B1215 are not indicated.

HINT:
Ignore any codes other than DTCs B1214 and B1215.

OK

Repair or replace the wire harness between the
combination meter ECU and back door ECU.

NG