Toyota Tundra. Manual — part 341

2. PERFORM ACTIVE TEST

HINT:

Using the Techstream to perform Active Tests allows relays, VSVs and actuators and other items to be
operated without removing any parts. This non-intrusive functional inspection can be very useful because

P-Door Lock

Pos SW

detection switch signal / ON
or OFF

unlocked
OFF: Passenger side door is
locked

-

RR-Door Lock

Pos SW*1, *2

Rear door RH lock position
switch signal / ON or OFF

ON: Rear door RH is unlocked
OFF: Rear door RH is locked

-

RL-Door Lock

Pos SW*1, *2

Rear door LH unlock
detection switch signal / ON
or OFF

ON: Rear door LH is unlocked
OFF: Rear door LH is locked

-

Door Lock

SW-Lock

Door manual lock switch
signal / ON or OFF

ON: Door control switch (for
driver side door) is turned to
lock position
OFF: Door control switch (for
driver side door) is turned to
unlock position

-

Door Lock

SW-Unlock

Door manual unlock switch
signal / ON or OFF

ON: Door control switch (for
driver side door) is turned to
unlock position
OFF: Door control switch (for
driver side door) is turned to
lock position

-

Door Key SW-

Lock

Door key linked lock switch
signal / ON or OFF

ON: Driver side door key
cylinder is turned to lock
position
OFF: Driver side door key
cylinder is turned to unlock
position

-

Door Key SW-

Unlock

Door key linked unlock
switch signal / ON or OFF

ON: Driver side door key
cylinder is turned to unlock
position
OFF: Driver side door key
cylinder is turned to lock
position

-

Key Unlock

Warning SW

Unlock warning switch / ON
or OFF

ON: Ignition key is inserted
OFF: Ignition key is not
inserted

-

HINT:



*1: for Double Cab



*2: for CrewMax

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Door Lock - Tundra

intermittent operation may be discovered before parts or wiring is disturbed. Performing Active Tests
early in troubleshooting is one way to save diagnostic time. Data List information can be displayed while
performing Active Tests.

a. Connect the Techstream to the DLC3.

b. Turn the ignition switch ON.

c. Enter the following menus:

Techstream - Select: Body Electrical / Main Body / Active Test.

d. Perform the Active Test by referring to the table below.

Techstream

Main body

TECHSTREAM ACTIVE TEST - MAIN BODY

DIAGNOSTIC TROUBLE CODE CHART

Wireless door lock control system

WIRELESS DOOR LOCK CONTROL SYSTEM DIAGNOSTIC TROUBLE CODE CHART

DTC B1242 WIRELESS DOOR LOCK TUNER CIRCUIT MALFUNCTION

DESCRIPTION

The door control receiver receives signals from the transmitter and sends these signals to the main body ECU.
This DTC is output when the applicable RDA signal cannot be received within 1 second of the PRG signal

Tester

Display

Test Part

Control Range

Diagnostic

Note

Wireless

buzzer

Sounds wireless buzzer

ON or OFF

-

Hazard

Flasher relay

ON or OFF

-

Vehicle Horn

Sounds vehicle horn

ON or OFF

-

Security Horn

Sounds security horn

ON or OFF

-

Door Lock

Operate door lock motor

LOCK or

UNLOCK

-

D-Door

Unlock

Operate driver side door lock motor

unlock

ON or OFF

-

DTC Code

Detection Item

Trouble Area

B1242

Wireless Door Lock Tuner Circuit
Malfunction



Harness or connector



Door control receiver



Main body ECU

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Door Lock - Tundra

being output from the main body ECU.

B1242 WIRELESS DOOR LOCK TUNER CIRCUIT MALFUNCTION DTC DETECTION
CONDITION

WIRING DIAGRAM

Fig. 58: Wireless Door Lock - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

1. CLEAR DTC

a. Clear the DTC (see DTC CHECK/CLEAR ).

DTC

No.

DTC Detection Condition

Trouble Area

B1242

In diagnostic mode, applicable RDA signal cannot be received within 1
second of PRG signal being output from main body ECU



Harness or
connector



Door control
receiver



Main body
ECU

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Door Lock - Tundra

2. CHECK FOR DTC

a. Check for DTC (see DTC CHECK/CLEAR ).

OK: DTC B1242 is not output.

NG: Go to step 3

OK: USE SIMULATION METHOD TO CHECK (See HOW TO PROCEED WITH
TROUBLESHOOTING )

3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - DOOR CONTROL RECEIVER)

a. Disconnect the J3 ECU connector.

b. Disconnect the Q7 receiver connector.

c. Measure the resistance according to the value(s) in the table below.

Standard resistance

HARNESS AND CONNECTOR (MAIN BODY ECU - DOOR CONTROL RECEIVER)
STANDARD RESISTANCE SPECIFICATION

Tester Connection

Condition Specified Condition

J3-12 (RDA) - Q7-2 (RDA)

Always

Below 1 ohms

J3-10 (PRG) - Q7-3 (PRG)

J3-12 (RDA) or Q7-2 (RDA) - Body ground

Always

10 kohms or higher

J3-10 (PRG)or Q7-3 (PRG) - Body ground

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Door Lock - Tundra