Toyota Tundra. Manual — part 337

troubleshooting the wireless door lock control system (see SYSTEM DESCRIPTION ).



Use these procedures to troubleshoot the wireless door lock control system.



*: Use the Techstream.

1. VEHICLE BROUGHT TO WORKSHOP

2. INSPECT BATTERY VOLTAGE

Standard voltage:

11 to 14 V

If the voltage is below 11V, recharge or replace the battery before proceeding.

3. CHECK FOR DTC*

a. Check for DTCs and note any codes that are output (see DTC CHECK/CLEAR ).

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

c. Recheck for DTCs. Based on the DTCs output above, try to force output of the same CAN

communication system DTC or wireless door lock control system DTC by simulating the
symptoms indicated by the DTC.

Result

DTC RESULT REFERENCE

B: Go to CAN COMMUNICATION SYSTEM (See DIAGNOSTIC TROUBLE CODE TABLE )

C: Go to DIAGNOSTIC TROUBLE CODE CHART

A: Go to next step

4. PROBLEM SYMPTOMS TABLE

Result

PROBLEM SYMPTOMS RESULT REFERENCE

B: Go to step 6

Result

Proceed to

DTC is not output

A

CAN communication system DTC is output

B

Wireless door lock control system DTC is output

C

Result

Proceed to

Fault is not listed in problem symptoms table

A

Fault is listed in problem symptoms table

B

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Door Lock - Tundra

A: Go to next step

5. OVERALL ANALYSIS AND TROUBLESHOOTING*

a. See OPERATION CHECK

b. See DATA LIST / ACTIVE TEST

c. See TERMINALS OF ECU

6. REPAIR OR REPLACE

7. CONFIRMATION TEST

NEXT: END

OPERATION CHECK

1. NOTICES WHEN CHECKING

a. Wireless door LOCK / UNLOCK function:

This function operates only when the vehicle is in its initial condition (the following 3 conditions
are met).



No key is inserted into the ignition key cylinder.

HINT:

The UNLOCK function operates even when the key is inserted into the ignition key cylinder.
However, the ignition switch must be OFF.



All the doors are closed.

HINT:

The UNLOCK function operates even when one of the doors is open.



The power door lock system is functioning normally.

b. The wireless transmitter operating range differs depending on the situation.



The operating range differs depending on the user, the way the transmitter is held and the
location.



In certain areas, the operating range will be reduced due to the vehicle body shape and the
influence of the surrounding environment.



The transmitter's weak electric waves may be affected if the area has strong electric waves or
noise. The transmitter's operating range may be reduced or the transmitter may not function.



When the battery weakens, the operating range is reduced and the transmitter may not
function.

HINT:

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Door Lock - Tundra

If the transmitter has had prolonged exposure to direct sunlight, such as being left on the
instrument panel, the battery may weaken or other problems may occur.

2. CHECK WIRELESS DOOR LOCK CONTROL FUNCTIONS

HINT:



The switches described below transmit signals and are built into the door control transmitter.



The transmitter's operating range must be taken into account while checks are being made.

a. Make sure the vehicle is in a condition in which the wireless control functions can be operated (see

above).

b. Check the basic functions:



Check that all the doors lock when the LOCK switch is pressed.



Check that the driver side door unlocks when the UNLOCK switch is pressed once.



Check that all the doors unlock when the UNLOCK switch is pressed twice within 3 seconds
after the driver side door is unlocked (2 step unlock function).

c. Check the chattering prevention function:

When a switch is pressed, check that the corresponding operation occurs only once. When the
switch is held down, check that the corresponding operation occurs only once and does not
repeatedly activate. Lastly, when the switch is pressed at 1 second intervals, check that the
corresponding operation activates once for each press of the switch.

d. Check the automatic locking function:

When all doors are unlocked with the UNLOCK switch and none of the doors are opened or locked
within 30 seconds, check that the doors are relocked automatically.

e. Check the switch operation fail-safe function:

If the key is in the ignition key cylinder, check that the doors cannot be locked by the LOCK
switch. However, this does not apply when the system is in recognition code registration mode.

f. Check the door ajar warning function:

If a door is open or not completely closed, check that the doors cannot be locked by the LOCK
switch and that the wireless door lock buzzer sounds for 10 seconds.

g. Check the answer-back function:



When the LOCK switch is pressed, confirm the simultaneous occurrence of all the hazard
warning lights and door mirror turn indicators flashing once, the buzzer sounding once and
all the doors locking.



When the UNLOCK switch is pressed, confirm the simultaneous occurrence of all the hazard
warning lights and door mirror turn indicators flashing twice, the buzzer sounding twice and
the driver side door unlocking.

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Door Lock - Tundra



When the UNLOCK switch is pressed again within 3 seconds, confirm the simultaneous
occurrence of all the hazard warning lights flashing twice, the buzzer sounding twice and all
the doors unlocking.

h. Check the illuminated entry function:



When all the doors are locked, check that pressing the UNLOCK switch causes the ignition
key cylinder light, room light and map light (when the light switch is in the DOOR position),
foot light and door mirror foot light* to illuminate simultaneously with the unlock operation.

HINT:

*: except Extended Type



After the lights illuminate, if nothing is performed, check that the lights fade out in 15
seconds.



After the lights illuminate, if the key is inserted into the key cylinder and the ignition switch
is turned ACC or ON within 15 seconds, check that the lights fade out.



While the lights are illuminated, if the LOCK switch is pressed and the doors lock, check that
the lights fade out 15 seconds after the doors lock.

i. Check the panic function:

Check that if the PANIC switch is held down for 1 second or more, the theft deterrent alarm
function sounds the vehicle horns and security horn, flashes the door mirror turn signal indicators,
headlights, taillights and hazard warning lights, and illuminates the map light and room light for 60
seconds. With the theft alarm function active, check that pressing any switch on the transmitter
causes the theft alarm function to stop.

REGISTRATION

1. DESCRIPTION OF CODE REGISTRATION

HINT:



Recognition code registration is necessary when replacing the door control transmitter or the door
control receiver.



Add mode is used to register new recognition codes while still retaining codes already registered.
This mode is used when a new transmitter is added. If the number of registered codes exceeds 4,
the previously registered codes will be erased in order, starting from the first registered code.



Rewrite mode is used to erase all the previously registered recognition codes in order to register
new recognition codes. This mode is used when the transmitter or the door control receiver is
replaced with a new one.



Confirmation mode is used to confirm how many recognition codes have already been registered
before registering any additional recognition codes.



Prohibition mode is used to erase all the registered codes and disables the wireless door lock
function. This mode is used when the transmitter is lost.



All of the following registration procedures must be performed in order and in a continuous

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Door Lock - Tundra