Back Door Closer System - Diagnosis: Pre-Check

BACK DOOR CLOSER SYSTEM DESCRIPTION

The back door closer system releases/closes the latch of the back door lock using a motor.

The back door closer system is used in the '04 RX330 with the power back door system.
Operating any power back door switch when the back door is fully closed inputs a request signal to the power back door ECU. The power back door ECU then outputs a "latch release" command to the back door lock in response to the input.
The latch can be released only when the back door is unlocked.

4 switches are built into the back door lock and the power back door ECU monitors each switch status. The power back door ECU controls latch "release/close" operations in response to the inputs from each switch.

BACK DOOR CLOSER SWITCHES FUNCTION

Switch	Function
Back door courtesy switch	Detects the status of back door on whether open or closed. This switch turns ON when back door is open or ajar and turns OFF when it is fully closed.
Position switch (Neutral switch)	Detects the driven gear positions of back door lock on whether in open position or closed position. This switch turns ON when back door lock moves to open position and turns OFF when it moves to close position.
Full-latch switch	Detects the fully closed position of latch. This switch turns ON when latch is in over-latch position.
Half-latch switch	Detects the "ajar" position of latch. This switch turns ON when latch is in open-latch position.

When any battery, fuse or the back door lock has been removed/installed, the back door lock is in the "lock" status. Therefore, it is necessary to unlock the back door using the transmitter switch or door control switch on the driver side door or passenger's door before opening the back door.

DIAGNOSIS SYSTEM

Inspect the DLC3.

HINT:

The vehicle's ECM uses ISO 9141-2 for communication. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 9141-2 format.

Fig 1: Identifying DLC3 Connectors

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

DLC3 CONNECTORS SPECIFIED CONDITION

Tester Connection	Condition	Specified Condition
7 (Bus + line) - 5 (Signal ground)	During communication	Pulse generation
4 (Chassis ground) - Body ground	Constant	Below 1 Ω
5 (Signal ground) - Body ground	Constant	Below 1 Ω
16 (B+) - Body ground	Constant	9 to 14 V

HINT:

If the screen displays UNABLE TO CONNECT TO VEHICLE after you have connected the cable of the hand-held tester to the DLC3, turned the ignition switch ON and used the hand-held tester, there is a problem on the vehicle side or tester side.

If communication is normal when the tester is connected to another vehicle, inspect the DLC3 of the original vehicle.
If communication is still impossible when the tester is connected to another vehicle, the problem is probably in the tester itself, so consult the Service Department listed in the tester's manual.

Check the battery voltage.
Standard: 11 to 14 V

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

CHECK DTC
1. Connect the hand-held tester to the DLC3.
2. Turn the ignition switch ON.
3. Read DTCs by following the prompts on the tester screen.
  HINT:
  
  Refer to the hand-held tester operator's manual for further details.
CLEAR DTC
1. Connect the hand-held tester to the DLC3.
2. Turn the ignition switch ON.
3. Erase the DTCs following the prompts on the tester screen.
  HINT:
  
  Refer to the hand-held tester operator's manual for further details.

DATA LIST

HINT:

Using the DATA LIST displayed on the hand-held tester, you can read the value of the switch, sensor, actuator, etc. without parts removal. Reading the DATA LIST as the first step of troubleshooting is one way to shorten the labor time.

Connect the hand-held tester to the DLC3.
Turn the ignition switch ON.

Read the DATA LIST according to the display on the tester.

Standard:

Power back door ECU

POWER BACK DOOR ECU DATA LIST

Item

Measurement Item/Display (Range)

Normal Condition

Diagnostic Note

COURTESY SW

Back door lock courtesy switch signal / OFF or ON

OFF: Back door is closed
ON: Back door is open

HALF RATCHET⁽¹⁾ SW

Back door lock half-latch⁽¹⁾¹ switch signal / OFF or ON

OFF: Back door is closed
ON: Back door is not completely closed

DOOR HANDLE SW

Back door opener switch (outside handle) signal / OFF or ON

OFF: Back door opener switch is not pushed
ON: Back door opener switch is pushed

⁽¹⁾	RATCHET appears on the display of the hand-held tester, however the name of the part corresponding to the display of the tester is "half-latch".

Multiplex network body ECU

MULTIPLEX NETWORK BODY ECU DATA LIST

Item	Measurement Item/Display (Range)	Normal Condition	Diagnostic Note
BACK DOR OPEN	Back door open judgment /PROHIBIT or PERMIT	PROHIBIT: Back door is in LOCK position (prohibited from being unlatched) PERMIT: Back door is in UNLOCK position (permitted to be unlatched)	-
B DOE OPER SW	Power back door opener/closer switch signal /ON or OFF	ON: Power back door opener/closer switch is pushed OFF: Power back door opener/closer switch is not pushed	-

Power window regulator master switch (Driver door ECU)

POWER WINDOW REGULATOR MASTER SWITCH (DRIVER DOOR ECU) DATA LIST

Item	Measurement Item/Display (Range)	Normal Condition	Diagnostic Note
LOCK POS SW	Door unlock detection switch signal/ON or OFF	ON: Any door is unlocked OFF: All doors are locked	-

ACTIVE TEST

HINT:

Performing the ACTIVE TEST using the hand-held tester allows you to operate the relay, VSV, actuator, etc. without parts removal. Performing the ACTIVE TEST as the first step of troubleshooting is one way to shorten the labor time. It is possible to display the DATA LIST during the ACTIVE TEST.

Connect the hand-held tester to the DLC3.
Turn the ignition switch ON.

Perform the ACTIVE TEST according to the display on the tester.

Standard:

Power back door ECU

POWER BACK DOOR ECU ACTIVE TEST

Item	Test Details	Diagnostic Note
LATCH RELEASE	Back door lock latch release OFF/ON	-
COURTESY SW SIG	Back door courtesy switch OFF/ON	Command signal from tester is prior to that from back door courtesy switch when these 2 signals occur at the same time.

BACK DOOR LOCK
1. When the battery is reconnected:
  If the back door is locked and therefore cannot be opened, it is necessary to unlock the back door using the door control switch or transmitter switch.
2. When the back door lock is replaced:
  The power back door ECU cannot receive a switch signal from the lock. This may cause the power back door system to enter fail-safe mode and DTC B2215 to set as well as make the system disabled. When the lock is replaced, be sure to perform the following: first properly connect the lock, second clear the DTC from memory using the hand-held tester and finally recheck that no DTC is output.
RESET (INITIALIZE)
1. Resetting the power back door system:
  The power back door ECU records the fully open position and fully closed position of the power back door in its memory and the power back door fully opens and fully closes based on this memory. In the case where any of the battery, fuse, power back door ECU or power back door drive unit are removed and then reinstalled, the power back door ECU loses the memory of the door positions. In such cases, resetting the system is necessary. However operation of the back door closer system has no effect on ECU memory.
  
  Reset the power back door system as follows:
  1. Fully close the back door.
  2. Activate the transmitter switch or power back door opener/closer switch to open the power back door.
  3. Check that the drive unit for the power back door stops operating at a predetermined position and that the damper stay allows the back door to move to the fully open position from the position where the drive unit stops. The power back door ECU records the fully open position at this time and the system has been reset.