- Sounds for 0.8 seconds when the combination switch assembly, back door control switch, back door opener switch assembly or transmitter switch (electrical key transmitter sub-assembly) is pressed.
- Sounds intermittently while the power back door is operating.
- Sounds twice for 0.1 seconds to notify that the direction of door movement will stop after being triggered by activation of the jam protection function.
- Sounds for 0.2 seconds when the back door opener switch assembly is pressed while the power back door is operating.
Lexus NX: System Description
Lexus NX Service Manual / Vehicle Exterior / Door / Hatch / Power Back Door System / System Description
SYSTEM DESCRIPTION
POWER BACK DOOR SYSTEM DESCRIPTION
(a) The power back door system controls the power back door by automatically opening and closing the power back door with a motor.
(1) The power back door system operates only when the necessary conditions are met.
(2) The multiplex network door ECU records the back door positions in the multiplex network door ECU.
If the auxiliary battery, power source fuses of the power back door system, or multiplex network door ECU is removed and then reinstalled, the multiplex network door ECU loses the memory of the door positions.
In such cases, initialization of the multiplex network door ECU is necessary. Refer to Initialization.
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(3) The multiplex network door ECU receives "OPEN/CLOSE" request signals for the back door. Then, the multiplex network door ECU controls the back door opening/closing operation by sending commands to the back door lock assembly and back door motor.
(4) The power back door system has various request signals: "OPEN/CLOSE" request signal from the transmitter switch (electrical key transmitter sub-assembly), "OPEN/CLOSE" request signal from the combination switch assembly, "OPEN" request signal from the back door opener switch assembly, "OPEN/CLOSE" request signal from the back door control switch, and "ON/OFF" request signal from the combination meter assembly.
(5) The power back door system sets off an alarm (using a buzzer) and hazard warning lights when the power back door starts operating.
(6) The power back door does not reverse rotation if any switch is pressed during operation.
(7) The power back door stops if any switch is pressed during operation.
(8) A pulse sensor and a power back door sensor assembly are used to prevent anything from being caught in the door while the power back door is closing (jam protection function).
(b) Function of main components:
| Component | Function |
|---|---|
| *: w/ Hands Free Power Back Door | |
| Power back door warning buzzer | |
| Hazard warning lights (w/ Power Back Door Hazard Warning Light) | Flash twice to notify that the power back door will start operating when an OPEN/CLOSE request signal is input from a switch while the back door is in the closed or fully open position. |
| Combination meter assembly |
|
| Transmitter switch (electrical key transmitter sub-assembly) |
|
| Back door control switch | Transmits a power back door OPEN/CLOSE request signal to the multiplex network door ECU via the main body ECU (multiplex network body ECU). |
| Back door opener switch assembly | Transmits a power back door OPEN request signal to the multiplex network door ECU via the certification ECU (smart key ECU assembly). |
| Combination switch assembly | Transmits a combination switch assembly signal to the multiplex network door ECU via the main body ECU (multiplex network body ECU). |
| Door control switch | Transmits a power back door open/close request signal to the multiplex network door ECU. |
| Kick door control sensor* | Detect the kick operation and transmits a detection signal to the multiplex network door ECU. |
POWER BACK DOOR OPERATION TIMING CHART
(a) Opening Operation (using combination switch assembly and transmitter switch [electrical key transmitter sub-assembly]):
| *1 | Power back door warning buzzer | - | - |
| *a | Combination switch assembly or transmitter switch (electrical key transmitter sub-assembly) | *b | Back door lock motor |
| *c | Latch switch | *d | Back door courtesy switch |
| *e | Power back door unit assembly set | *f | Hazard warning light (w/ Power Back Door Hazard Warning Light) |
| *g | 0.8 seconds | *h | Conditions to start automatic operation are met |
| *i | Returns to original position | *j | Release output |
| *k | Open output | *l | Speed control range |
| *m | State of back door | *n | Fully opened |
| *o | Door ajar | *p | Memory stop position |
(b) Opening Operation (using back door opener switch assembly):
| *1 | Back door opener switch assembly | *2 | Power back door warning buzzer |
| *a | Back door lock motor | *b | Latch switch |
| *c | Back door courtesy switch | *d | Power back door unit assembly set |
| *e | Hazard warning light (w/ Power Back Door Hazard Warning Light) | *f | Conditions to start automatic operation are met |
| *g | 0.8 seconds | *h | Operation standby time |
| *i | Returns to original position | *j | Release output |
| *k | Open output | *l | Speed control range |
| *m | State of back door | *n | Fully opened |
| *o | Door ajar | *p | Memory stop position |
(c) Opening operation (using back door control switch):
| *1 | Back door control switch | *2 | Power back door warning buzzer |
| *a | Power back door unit assembly set | *b | Hazard warning light (w/ Power Back Door Hazard Warning Light) |
| *c | Conditions to start automatic operation are met | *d | 0.8 seconds |
| *e | Open output | *f | Speed control range |
| *g | State of back door | *h | Partway position |
| *i | Door ajar | *j | Memory stop position |
(d) Opening operation (using kick door control sensor) (w/ Hands Free Power Back Door):
| *1 | Kick door control sensor | *2 | Power back door warning buzzer |
| *3 | Multiplex network door ECU | *4 | Main body ECU (multiplex network body ECU) |
| *5 | Certification ECU (smart key ECU assembly) | - | - |
| *a | Power back door unitassembly set | *b | Kick operation detection signal |
| *c | 0.8 seconds | *d | Power back door open operation request |
| *e | Power back door open operation request and buzzer sound request | *f | Vehicle outside/inside key verification and door unlock request |
| *g | All door unlock | *h | Door unlatch request |
| *i | State of back door | *j | Open operation starts |
(e) Closing Operation (using combination switch assembly and transmitter switch [electrical key transmitter sub-assembly]):
| *1 | Power back doorwarning buzzer | - | - |
| *a | Combination switch assembly or transmitter switch (electrical key transmitter sub-assembly) | *b | Back doorlock motor |
| *c | Latch switch | *d | Pawl switch |
| *e | Back door courtesy switch | *f | Power back door unitassembly set |
| *g | Hazard warning light (w/ Power Back Door Hazard Warning Light) | *h | 0.8 seconds |
| *i | Conditions to start automatic operation are met | *j | Pull-in |
| *k | 1 second wait | *l | Returns to original position |
| *m | Closer delay time 0.3 seconds | *n | Closer output |
| *o | Speed control rage | *p | State of back door |
| *q | Stop position | *r | Door ajar |
| *s | Fully closed | - | - |
(f) Closing Operation (using back door control switch):
| *1 | Back door control switch | *2 | Power back door warning buzzer |
| *a | Back door lock motor | *b | Latch switch |
| *c | Pawl switch | *d | Back door courtesy switch |
| *e | Power back door unit assembly set | *f | Hazard warning light (w/ Power Back Door Hazard Warning Light) |
| *g | 0.8 seconds | *h | Conditions to start automatic operation are met |
| *i | Pull-in output | *j | 1 second wait |
| *k | Return to original position | *l | Closer delay time 0.3 seconds |
| *m | Closer output | *n | Speed control range |
| *o | State of back door | *p | Stop position |
| *q | Door ajar | *r | Fully closed |
(g) Closing operation (using kick door control sensor) (w/ Hands Free Power Back Door):
| *1 | Kick door control sensor | *2 | Power back door warning buzzer |
| *3 | Multiplex network door ECU | *4 | Main body ECU (multiplex network body ECU) |
| *5 | Certification ECU (smart key ECU assembly) | - | - |
| *a | Power back door unit assembly set | *b | Detection signal |
| *c | 0.8 seconds | *d | 0.2 seconds |
| *e | Key verification request | *f | Buzzer sound request |
| *g | Cabin certification result signal | *h | State of back door |
| *i | Close operation starts | - | - |
(h) Closing Operation (using door control switch):
| *1 | Door control switch | *2 | Power back door warning buzzer |
| *a | Back door lock motor | *b | Latch switch |
| *c | Pawl switch | *d | Back door courtesy switch |
| *e | Power back door unit assembly set | *f | Hazard warning light (w/ Power Back Door Hazard Warning Light) |
| *g | 0.8 seconds | *h | 1 second |
| *i | Conditions to start automatic operation are met | *j | Closer delay time 1 second |
| *k | Pull-in output | *l | Return to original position |
| *m | Closer output | *n | 0.3 seconds |
| *o | Speed control range | *p | State of back door |
| *q | Stop position | *r | Door ajar |
| *s | Fully closed | - | - |
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