Toyota Sequoia (2005). Manual - part 534

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DIAGNOSTICS

MULTIPLEX COMMUNICATION SYSTEM

DI–1931

2125

DTC

B1234

Jam protection pulse switch circuit on
passenger door

CIRCUIT DESCRIPTION

This DTC is output while the body ECU senses switch position information through the pulse switch, which
is built into the power window motor.
If the DTC is not output when the power window operates, the following may be malfunctioning:

DTC No.

DTC Detecting Condition

Trouble Area

B1234

No change in pulse switch position information for more than

2.0 seconds even if moving the glass down when limit switch is

OFF (window glass is fully closed).

Pulse switch (Built in power window motor)

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.

DIDFH–01

DI–1932

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DIAGNOSTICS

MULTIPLEX COMMUNICATION SYSTEM

2126

DTC

B1241

Body ECU switch circuit diagnosis

CIRCUIT DESCRIPTION

This DTC notifies how the switch works as follows:
If the DTC is not indicated when operating the back door power window switch or rear wiper and washer
switch, it means failure of switch contact. If the DTC is indicated when not operating the back door power
window switch or rear wiper and washer switch, it means the switch is stick. When something wrong is found
by this diagnosis, inspect each switch. Replace the switch if there is a problem, or check the wire harness
if there is no problem.

DTC No.

DTC Detecting Condition

Trouble Area

B1241

Back door power window switch and rear wiper and washer

switch operate normally.

Back door power window switch

Rear wiper and washer switch

Wire harness

Body ECU

HINT:
For details of inspection, see page 

DI–1686

.

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

DI637–05

I15555

Body ECU

W2 
Wireless Door Lock 
Control Receiver

2

PRG

RDA

4

5

V

R–G

3

B5

PRG

RDA

B5

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DIAGNOSTICS

MULTIPLEX COMMUNICATION SYSTEM

DI–1933

2127

DTC

B1242

Wireless door lock tuner circuit mal-
function

CIRCUIT DESCRIPTION

This DTC is indicated when ground short of the RDA terminal is detected.

DTC No.

DTC Detecting Condition

Trouble Area

B1242

Ground short of RDA circuit

Wireless door lock control receiver

Wire harness

Body ECU

WIRING DIAGRAM

DI638–10

I03347

Receiver

Body ECU

RDA

W2

B5

I03348

Body ECU

Receiver

DI–1934

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DIAGNOSTICS

MULTIPLEX COMMUNICATION SYSTEM

2128

INSPECTION PROCEDURE

1

Check wire harness and connector (Wireless door lock control receiver – body
ECU).

PREPARATION:
Disconnect the receiver and body ECU connectors.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:

Tester connection 

(Symbol)

Condition

Specification

B5–4 (RDA) – 

Body ground

Always

10 k

Ω

 or higher

NG

Repair or replace the wire harness.

OK

2

Check body ECU.

PREPARATION:
Reconnect the body ECU connector.
CHECK:
Check the DTC (See page 

DI–1904

).

OK:

DTC B1242 is not indicated.

HINT:
Ignore any codes other than DTC B1242.

NG

Replace the body ECU.

OK

Replace the wireless door lock control re-
ceiver.