Toyota Sequoia (2005). Manual - part 532

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DIAGNOSTICS

MULTIPLEX COMMUNICATION SYSTEM

DI–1923

2117

16

Check for a short circuit between the combination meter and the integration con-
trol and panel.

PREPARATION:
(a)

Reconnect connector ”B11” of the back door ECU.

(b)

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

Repair or replace the wire harness between the
combination meter and the integration control
and panel.

NG

17

Check for a short circuit between the body ECU and driver door ECU.

PREPARATION:
(a)

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

(b)

Reconnect connector ”C5” of the combination meter.

(c)

Disconnect connector ”D22” of the driver door ECU.

(d)

Disconnect connector ”B6” 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
body ECU and driver door ECU.

NG

Replace the body ECU.

DI–1924

–

DIAGNOSTICS

MULTIPLEX COMMUNICATION SYSTEM

2118

DTC

B1221

Power window switch circuit on driver
door

CIRCUIT DESCRIPTION

This DTC is output only if the power window master switch AUTO UP/DOWN operation is performed.
If the DTC is not output, the following may be malfunctioning:

DTC No.

DTC Detecting Condition

Trouble Area

B1221

Does not operate either of the power window master switch 

(except window lock switch)

Power window master switch (Built in driver door ECU)

Wire harness

Body ECU

HINT:
For details of inspection, see page 

DI–1782

.

If the problem reoccurs even after replacement, replace the body ECU.

DI1SP–08

–

DIAGNOSTICS

MULTIPLEX COMMUNICATION SYSTEM

DI–1925

2119

DTC

B1222

Door lock switch circuit on driver door

CIRCUIT DESCRIPTION

This DTC is output while the body ECU senses the door unlock state through the door unlock detection
switch, which is built into the door lock motor.
If the DTC is not output, the following may be malfunctioning:

DTC No.

DTC Detecting Condition

Trouble Area

B1222

Does not operate door key lock and unlock switch

Door lock control switch front LH (Built in driver door ECU)

Door unlock detection switch front LH

Wire harness

Body ECU

HINT:
For details of inspection, see page 

DI–1782

.

If the problem reoccurs even after replacement, replace the body ECU.

DIDFD–01

DI–1926

–

DIAGNOSTICS

MULTIPLEX COMMUNICATION SYSTEM

2120

DTC

B1223

Power window switch circuit on pas-
senger door

CIRCUIT DESCRIPTION

This DTC is output only if the power window switch AUTO UP/DOWN operation is performed.
If the DTC is not output, the following may be malfunctioning:

DTC No.

DTC Detecting Condition

Trouble Area

B1223

Does not operate power window switch or door lock control

Power window switch (Built in passenger door ECU)

Wire harness

Body ECU

HINT:
For details of inspection, see page 

DI–1818

.

If the problem reoccurs even after replacement, replace the body ECU.

DIDFE–01