Section 416 (Power Back Door System - Diagnosis): Pre-Check

1. The power back door system controls the power back door to automatically open/close using a motor.
   1. The power back door system operates only when the necessary conditions are present.
   2. The power back door ECU records the back door positions in the memory. When any of the battery, fuse, power back door ECU and 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 power back door system is necessary. Please refer to the resetting operation specified in step  7.
   3. "Open/close" request signals for the back door are input to the power back door ECU. Then, the power back door ECU controls the back door opening/closing operation by outputting commands to the back door lock and back door drive unit.
   4. The power back door system has various request signals: "OPEN/CLOSE" request signal from the transmitter switch, "OPEN/CLOSE" request signal from the power back door opener/closer switch, "CLOSE" request signal from the power back door closer switch, and "OPEN" request signal from the back door opener switch (outside handle switch).
   5. The power back door system sets off an alarm using a buzzer and hazard warning lamps when the power back door starts operating.
   6. The power back door system causes a buzzer to sound in warning when the shift lever is moved into any position except P when the power back door starts operating or while the power back door is operating and the buzzer continues sounding.
   7. The power back door system turns OFF when the shift lever is moved into any position except P while the power back door is opening. The power back door continues to close when the shift lever is moved into any position except P while the power back door is closing.
   8. The power back door reverses the direction that the power back door is operating when any switch is pressed during operation.
   9. A pulse sensor and a touch sensor are used to prevent anything from being gets caught in while the power back door is operating (jam protection function).
   10. The power back door system stops motor operation and switches to the manual operation mode when the jam protection function is activated repeatedly more than the specified number of times.
   11. The power back door system slows the back door down when the back door comes closer to the fully open position or fully closed position in order to reduce the impact against the vehicle body.
2. Operational condition
   OPERATIONAL CONDITION DESCRIPTION
   
   

   Function	Switch	Necessary Condition
   OPEN operation	Transmitter switch Power back door opener/closer switch Back door opener switch (Outside handle switch) (This switch can be set ON by customization. Default setting is OFF)	Power back door OFF switch: ON (pressed) Shift position: P position Back door lock: Unlocked Door position: Between fully closed position and half-open position
   CLOSE operation	Transmitter switch Power back door opener/closer switch Power back door closer switch	Power back door OFF switch: ON (pressed) Shift position: P position Touch sensor: Neither pressed nor open Door position: Between fully open position and half-open position

3. Function description
   FUNCTION DESCRIPTION
   
   

   Function	Contents
   Back door buzzer (Sounds differently depending on the situation; when power back door starts operation, when system outputs warning and when power back door reverses moving direction)	When power back door starts operation: Sounds twice (a cycle of 0.5 sec.) to notify that power back door will start operating when a request is input from the switch(1) while back door is fully closed/open. When system outputs warning: Sounds continuously (a cycle of 0.3 sec.) in warning when shift lever is moved into any position except P while back door is open or ajar (courtesy switch ON and door not fully latched). Sounds continuously (a cycle of 0.3 sec.) in warning when shift lever is moved into any position except P while back door is opening/closing. When power back door reverses moving direction: Sounds once for 0.3 sec. to notify that power back door will reverse moving direction after being triggered by witch operation or activation of jam protection function.
   Hazard lamps (Output signals are sent from power back door ECU to hazard lamps via body ECU)	When power back door starts operation: Flashes twice to notify that power back door will start operating when a request is input from the switch(1) while back door is fully closed/open.
   Reverse Operation	During opening operation: Power back door reverses the direction of movement and moves to fully closed position when any of transmitter switch, power back door opener/closer switch or power back door closer switch are pressed during opening operation. During closing operation: Power back door reverses the direction of movement and moves to fully open position when any of transmitter switch, power back door opener/closer switch or back door opener switch (outside handle switch) are pressed during closing operation.
   Jam protection function	During opening operation: When pulse sensor detects any change in speed while back door is opening, the system interprets it as "jam" and reverses the direction of movement and returns back door to fully closed position. During closing operation: When pulse sensor detects any change in speed while back door is closing, the system interprets it as "jam" and reverses the direction of movement and returns back door to fully open position. When either touch sensor is pressed while back door is closing, the system interprets it as "jam" and reverses the direction of movement and returns back door to fully open position.
   Manual operation mode	The system switches to manual operation mode: The system stops motor and switches to manual operation mode when "jam protection function" has been activated 2 or more consecutive times and when the 2nd or most recent activation has occurred during closing. The system return to normal operation mode: The system returns to normal operation mode by pressing the switch again or fully closing the door. Power back door is activated to open when the system returns to normal operation mode by pressing the switch(1) and the door is between fully closed position and half-open position, and it is activated to close when the system returns to normal operation mode by pressing the switch(1) and the door is between fully open position and half-open position:
   Power back door system stop function	The system switches OFF (manual operation mode) when either of the following is detected: DTC B2222 Either touch sensor has short/open circuit Shift lever is moved into P position while power back door is opening When the problem indicated by step 1 has been solved, the system switches to normal operation mode.
   HINT" (1) For details of the switch, refer to SWITCHES CONTENTS

4. Switches
   SWITCHES DESCRIPTION
   
   

   Switches	Contents
   Power back door OFF switch Located in the glove box on the passenger side	The system operates when the switch is in "ON" position (pressed). The system does not operate when the switch is in "OFF" position (not pressed).
   Transmitter switch ("PWR DOOR" switch)	Pressing the switch causes power back door to open/close. Pressing it again during operation reverses the direction of movement. Request is input when the switch has been pressed for 0.8 sec. and the back door is fully closed or fully open. "0.8 sec." is the default setting and can be changed by customization (See CUSTOMIZE PARAMETERS  ). The power back door reverses the direction of movement immediately when the switch is pressed while in operation. Pressing the switch during manual operation mode returns the system to normal operation mode. The switch does not function while the ignition switch is ON (key is inserted into the ignition key cylinder).
   Power back door opener/closer switch Located on the instrument panel on the driver side	Pressing the switch causes power back door to open/close. Pressing it again during operation reverses the direction of movement. Request is input when the switch has been pressed for 0.8 sec. and the back door is fully closed or fully open. "0.8 sec." is the default setting and can be changed by customization (See CUSTOMIZE PARAMETERS  ). The power back door reverses the direction of movement immediately when the switch is pressed while in operation. Pressing the switch during manual operation mode returns the system to normal operation mode.
   Power back door closer switch Located on the back door trim	Pressing the switch when back door is fully open causes power back door to close. Pressing the switch while power back door is opening reverses the direction of movement and returns back door to fully closed position. Request is input when the switch is pressed. Pressing the switch during manual operation mode returns the system to normal operation mode.
   Back door opener switch (Outside handle switch)	Pressing the switch when the back door is fully closed and is unlocked causes back door latch to be released although back door does not open. This setting can be changed by customization (See CUSTOMIZE PARAMETERS  ). Request is input only when the vehicle speed is 5 km/h (8 mph) or less. Pressing the switch while back door is closing reverses the direction of movement and returns the back door to fully open position. Pressing the switch during manual operation mode does not return the system to normal operation mode.

1. 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: Inspecting DLC3

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   DIAGNOSIS SYSTEM TERMINAL CONNECTION AND 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 instruction manual.
2. Check the battery voltage.

   Standard: 11 to 14 V 

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

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.

1. Connect the hand-held tester to the DLC3.
Fig 2: Connecting Hand-Held Tester To DLC3
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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.

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.

1. Connect the hand-held tester to the DLC3.
2. Turn the ignition switch ON.
3. 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) 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	-
   DOOR POS-1/4	Back door position (Fully closed - 1/4 open)/OK or CAUTION	OK: Back door position is fully closed - 1/4 open CAUTION: Back door position is not fully closed - 1/4 open	(2)
   DOOR POS-2/4	Back door position (1/4 open - 2/4 open)/OK or CAUTION	OK: Back door position is 1/4 open - 2/4 open CAUTION: Back door position is not 1/4 open - 2/4 open	(2)
   DOOR POS-3/4	Back door position (2/4 open - 3/4 open)/OK or CAUTION	OK: Back door position is 2/4 open - 3/4 open CAUTION: Back door position is not 2/4 open - 3/4 open	(2)
   DOOR POS-OPEN	Back door position (3/4 open - fully open)/OK or CAUTION	OK: Back door position is 3/4 open - fully open CAUTION: Back door position is not 3/4 open - fully open	(2)
   PBDSW OPEN	Power back door closer switch operation /0.0s(3) or 0.8s	0.0s(3): Power back door closer switch 1 -press operates power back door 0.8s: Power back door closer switch 0.8 sec.-press (long press) operates power back door	-
   PBD BUZZ VOL	Warning buzzer volume during power back door operation/OFF, SMALL or LARGE	OFF: Warning buzzer that notifies power back door is operating does not sound SMALL: Warning buzzer that notifies power back door is operating sounds at small volume LARGE: Warning buzzer that notifies power back door is operating sounds at large volume	-
   WIRELS PBD OPER	Wireless power back door switch operation (Transmitter switch operation)/1TIME, 2TIMES, 0.8sPR or OFF	1TIME: Transmitter switch 1-press operates power back door 2TIMES: Transmitter switch 2-presses operates power back door 0.8sPR: Transmitter switch 0.8s.-press operates power back door OFF: Transmitter switch operation is disabled	-
   PBD ASSIST CLS	Power back door assist-close operation/OFF or ON	OFF: Back door is opened or closed ON: Back door is closed by power assist	-
   PBD ASSIST OPN	Power back door assist-open operation/OFF or ON	OFF: Back door is opened or closed ON: Back door is opened by power assist	-
   PBD TOUCH SEN R	Power back door touch sensor RH signal/OFF, ON or OPEN	OFF: Power back door touch sensor RH is idle ON: Power back door touch sensor RH is pressed OPEN: Power back door touch sensor RH is open	-
   PBD TOUCH SEN L	Power back door touch sensor LH signal/OFF, ON or OPEN	OFF: Power back door touch sensor LH is idle ON: Power back door touch sensor LH is pressed OPEN: Power back door touch sensor LH is open	-
   PBD MAIN(4) SW	Power back door off switch(4) signal/OFF or ON	OFF: Power back door off switch is not pushed ON: Power back door off switch is pushed	-
   HINT: (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". (2) In the case where the CAUTION is displayed even without applying resistance in each range, a foreign object caught in that range. (3) "0.0s" appearing on the display of the hand-held tester means that a 1-press of the satellite switch operates the power back door. (4) MAIN appears on the display of the hand-held tester, however the name of the part corresponding to the display of the tester is "power back door off switch".

   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	-

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.

1. Connect the hand-held tester to the DLC3.
2. Turn the ignition switch ON.
3. Perform the ACTIVE TEST according to the display on the tester.

   Standard: 

   Power back door ECU 

   ACTIVE TEST (POWER BACK DOOR ECU)
   
   

   Item	Test Details	Diagnostic Note
   LATCH RELEASE	Back door lock latch is released OFF/ON	-
   PBD MOTOR	Power back door motor is in operation OFF/FORWARD/REVERSE	Clutch is OFF while power back door motor is in operation
   PBD CLUTCH	Power back door clutch is in operation OFF/ON	Power back door motor is OFF when clutch is ON
   PBD BUZZER	Power back door buzzer sound OFF/ON	Buzzer sounds once for 0.5 sec.
   COURTESY SW SIG	Back door courtesy switch OFF/ON	Command signal from tester is prior to the signal from back door courtesy switch when these 2 signals occur at the same time.

   Multiplex network body ECU 

   ACTIVE TEST (MULTIPLEX NETWORK BODY ECU)
   
   

   Item	Test Details	Diagnostic Note
   TRUNK/BDOR OPEN	Operate back door open OFF/ON	-
   DOOR LOCK	Operate door lock motor for all doors OFF/LOCK/UNLOCK	All doors are closed

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.

1. Resetting the power back door system:

   The power back door ECU records the fully open position and the 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 batteries, fuses, 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 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.