DOOR LOCK: WIRELESS DOOR LOCK CONTROL SYSTEM: DESCRIPTION (2008 Sequoia)

Last Modified: 11-29-2007		1.6 J
Service Category: Vehicle Interior	Section: Door Lock
Model Year: 2008	Model: Sequoia	Doc ID: RM000001WYB00KX
Title: DOOR LOCK: WIRELESS DOOR LOCK CONTROL SYSTEM: DESCRIPTION (2008 Sequoia)

Only Wireless Control Function is Inoperative

DESCRIPTION

The door control receiver receives signals from the transmitter and sends these signals to the main body ECU. The main body ECU then controls all doors by sending lock/unlock signals to each door, and sends hazard flasher relay signals to the turn signal flasher relay (hazard warning lights).

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1.	CHECK WIRELESS DOOR LOCK CONTROL FUNCTIONS

(a) Check the wireless door lock control system function .

Result

Result	Proceed to
The wireless door LOCK/UNLOCK function does not operate with transmitter	A
The power back door function does not operate with transmitter	B

2.	CHECK DOOR CONTROL TRANSMITTER

(a) When another registered door control transmitter is used, check that the wireless operates normally.

Result

Result	Proceed to
Wireless door LOCK/UNLOCK function operates and door control transmitter that did not operate is electrical key transmitter	A
Wireless door LOCK/UNLOCK function does not operate	B

3.	CHECK TRANSMITTER LED ILLUMINATION

(a) Check that the transmitter's LED illuminates 3 times when the switch is pressed 3 times.

Result

Result	Proceed to
Transmitter's LED does not illuminate 3 times when switch is pressed 3 times	A
Transmitter's LED illuminates 3 times when switch is pressed 3 times	B
The transmitter's LED does not illuminate the second or third time	C

HINT:

If the transmitter's LED does not illuminate the second or third time, replace the transmitter battery as it is depleted.

4.	INSPECT TRANSMITTER BATTERY (VOLTAGE)

(a) Electrical key transmitter

(1) Remove the battery from the electrical key transmitter that does not operate. Attach a lead wire (0.6 mm (0.0236 in.) in diameter or less including wire sheath) with tape or equivalent to the negative terminal .

NOTICE:

Do not wrap the lead wire around a terminal, wedge it between terminals, or solder it. A terminal may be deformed or damaged, and the battery will not be able to be installed correctly.

(2) Carefully pull the lead wire out from the position shown in the illustration and install the previously removed transmitter battery.

(3) Using an oscilloscope, check the transmitter battery voltage waveform.

HINT:

Measure the transmitter battery voltage while pressing the LOCK or UNLOCK switch on the transmitter.

Standard Voltage:

Item	Content
Tester Connection	Battery positive (+) - Battery negative (-)
Tool Setting	0.5 V/DIV., 100 ms/DIV.
Condition	Power switch OFF, all doors closed and lock switch pushed
Specified Condition	2.2 to 3.2 V (Refer to the waveform)

5.	CHECK ROOM LIGHT ASSEMBLY

(a) Check that the room light illumination operates normally.

OK:

Room light operation normally.

6.	SWITCH TO SELF-DIAGNOSTIC MODE

(a) Switch to self-diagnostic mode by operating the ignition key cylinder.

(1) Make sure the vehicle is in its initial condition. Then insert the key into the ignition key cylinder and remove it.

(2) Within 5 seconds of removing the key, insert the key into the ignition key cylinder (ignition switch off). Then turn the ignition switch to ON and off.

(3) Within 30 seconds of turning the ignition switch off, perform the following operation 9 times: turn the ignition switch to ON and then off.

NOTICE:

If the system cannot enter self-diagnostic mode, the system returns to normal mode.

HINT:

Turning the ignition switch to ON after the above operations have been completed ends self-diagnostic mode.
Do not lock or unlock doors during self-diagnostic mode.

(b) Check that the system has switched to self-diagnostic mode by checking the room light flash pattern.

OK:

Flash pattern is same as illustration.

7.	CHECK BY SELF DIAGNOSTIC MODE

(a) Inspect the diagnosis outputs when the door control transmitter switch is held down. The diagnosis outputs can be checked by the flash patterns of the room light.

Result

Result	Proceed to
Unmatching recognition code is output	A
Normal waves (light flash patterns) is output	B
No diagnosis outputs	C

8.	REGISTER RECOGNITION CODE

(a) Check that the system can be switched to rewrite mode or add mode, and that a recognition code can be registered .

OK:

Recognition code can be registered.

9.	CHECK DOOR CONTROL RECEIVER (RESPONSE)

(a) Prepare the door control transmitter of another vehicle.

(b) Hold down the door control transmitter switch.

OK:

Unmatching recognition code is output.

10.	REPLACE DOOR CONTROL RECEIVER

(a) Temporarily replace the door lock control receiver with a new or normally functioning one .

11.	REGISTER RECOGNITION CODE

(a) Perform the registration procedures .

12.	CHECK DOOR CONTROL RECEIVER (OPERATION)

(a) Check that the doors can be locked and unlocked by using the transmitter LOCK and UNLOCK switches.

OK:

Doors can be locked and unlocked with transmitter.

13.	INSPECT UNLOCK WARNING SWITCH

(a) Remove the unlock warning switch .

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

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
1 - 2	Free	10 kΩ or higher
1 - 2	Pushed	Below 1 Ω

14.	CHECK HARNESS AND CONNECTOR (UNLOCK WARNING SWITCH - MAIN BODY ECU AND BODY GROUND)

(a) Disconnect the H21 unlock warning switch connector.

(b) Disconnect the H1 main body ECU connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
H21-1 - H1-5 (KSW)	Always	Below 1 Ω
H21-2 - Body ground	Always	Below 1 Ω
H1-5 (KSW) or H21-1 - Body ground	Always	10 kΩ or higher

(d) Reconnect the unlock warning switch connector.

(e) Reconnect the main body ECU connector

15.	INSPECT DOOR CONTROL RECEIVER (OUTPUT)

(a) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
O25-2 (RDA) - Body ground	Transmitter switch ON → OFF (No key in ignition key cylinder, all doors closed)	Below 1 V → 6 to 7 V → Below 1 V

16.	REPLACE DOOR CONTROL TRANSMITTER

(a) Temporarily replace the door control transmitter module with a new or normally functioning one.

17.	REGISTER RECOGNITION CODE

(a) Perform the registration procedures .

18.	CHECK DOOR CONTROL TRANSMITTER MODULE

(a) Check that the doors can be locked and unlocked by using the transmitter LOCK and UNLOCK switches.

OK:

Doors can be locked and unlocked with transmitter.