Front Power Seat Control System (W/Memory): Pre-Check

DIAGNOSIS SYSTEM

Description
1. The position control ECU & switch on this vehicle control the functions of the front power seat control system with memory.
  Data of the system can be read by the Data Link Connector 3 (DLC3) of the vehicle.
  
  Therefore, when the system seems to be malfunctioning, use the hand-held tester to check for a malfunction and repair it.

Inspect the DLC3.

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

Fig 1: Inspecting DLC3

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard:

DLC3

Tester Connection	Condition	Specified Condition
7 (Bus + line) - 5 (Signal ground)	During communication	Pulse generation
4 (Chassis ground) - Body ground	Always	Below 1 Ω
5 (Signal ground) - Body ground	Always	Below 1 Ω
16 (B+) - Body ground	Always	10 to 14 V

HINT:

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

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

DATA LIST

HINT:

Using the DATA LIST displayed on the hand-held tester, you can read the value of the switch, sensor, 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 window regulator master switch assy

POWER WINDOW REGULATOR MASTER SWITCH ASSY DATA LIST

Item	Measurement Item/Display (Range)	Normal Condition
SEAT SET SW	Seat memory set switch signal/ON or OFF	ON: Seat memory set switch is ON OFF: Seat memory set switch is OFF
SEAT MEM M1	Seat memory switch M1 signal/ON or OFF	ON: Seat memory switch M1 is ON OFF: Seat memory switch M1 is OFF
SEAT MEM M2	Seat memory switch M2 signal/ON or OFF	ON: Seat memory switch M2 is ON OFF: Seat memory switch M2 is OFF

Standard: Position control ECU & switch assy

POSITION CONTROL ECU & SWITCH ASSY DATA LIST

Item	Measurement Item/Display (Range)	Normal Condition
RECLIN SW REAR	Reclining switch signal (Rearward)/ON or OFF	ON: Reclining switch (Rearward) is ON
RECLIN SW REAR	Reclining switch signal (Rearward)/ON or OFF	OFF: Reclining switch (Rearward) is OFF
RECLIN SW FRONT	Reclining switch signal (Forward)/ON or OFF	ON: Reclining switch (Forward) is ON
RECLIN SW FRONT	Reclining switch signal (Forward)/ON or OFF	OFF: Reclining switch (Forward) is OFF
F VTCL SW DOWN	Front vertical switch signal (Downward)/ON or OFF	ON: Front vertical switch (Downward) is ON
F VTCL SW DOWN	Front vertical switch signal (Downward)/ON or OFF	OFF: Front vertical switch (Downward) is OFF
F VTCL SW UP	Front vertical switch signal (Upward)/ON or OFF	ON: Front vertical switch (Upward) is ON
F VTCL SW UP	Front vertical switch signal (Upward)/ON or OFF	OFF: Front vertical switch (Upward) is OFF
LIFTER SW DOWN	Lifter switch signal (Downward)/ON or OFF	ON: Lifter switch (Downward) is ON
LIFTER SW DOWN	Lifter switch signal (Downward)/ON or OFF	OFF: Lifter switch (Downward) is OFF
LIFTER SW UP	Lifter switch signal (Upward)/ON or OFF	ON: Lifter switch (Upward) is ON
LIFTER SW UP	Lifter switch signal (Upward)/ON or OFF	OFF: Lifter switch (Upward) is OFF
SLIDE SW REAR	Sliding switch signal (Rearward)/ON or OFF	ON: Sliding switch (Rearward) is ON
SLIDE SW REAR	Sliding switch signal (Rearward)/ON or OFF	OFF: Sliding switch (Rearward) is OFF
SLIDE SW FRONT	Sliding switch signal (Forward)/ON or OFF	ON: Sliding switch (Forward) is ON
SLIDE SW FRONT	Sliding switch signal (Forward)/ON or OFF	OFF: Sliding switch (Forward) is OFF
POWER VOLTAGE	Power supply for position control ECU & switch/MIN: 0V, MAX: 19.89V	Within range from 11 V to 14 V
IG SW	Ignition switch status/ON or OFF	ON Ignition switch is ON
IG SW	Ignition switch status/ON or OFF	OFF: Ignition switch is OFF
KEY UNLOCK SW	Key unlock warning switch signal/ON or OFF	ON: Key is in ignition key cylinder
KEY UNLOCK SW	Key unlock warning switch signal/ON or OFF	OFF: Key is not in ignition key cylinder
D-DOOR WARN SW	Door courtesy switch signal/ON or OFF	ON: Driver side door is open
D-DOOR WARN SW	Door courtesy switch signal/ON or OFF	OFF: Driver side door is closed
PNP SW	Park/neutral position switch signal/ON or OFF	ON: Shift lever in neutral position
PNP SW	Park/neutral position switch signal/ON or OFF	OFF: Shift lever in any position except neutral
M2 SW	Seat memory switch M2 signal/ON or OFF	ON: Seat memory switch M2 is ON
M2 SW	Seat memory switch M2 signal/ON or OFF	OFF: Seat memory switch M2 is OFF
M1 SW	Seat memory switch M1 signal/ON or OFF	ON: Seat memory switch M1 is ON
M1 SW	Seat memory switch M1 signal/ON or OFF	OFF: Seat memory switch M1 is OFF
SET SW	Seat memory set switch signal/ON or OFF	ON: Memory set switch is ON
SET SW	Seat memory set switch signal/ON or OFF	OFF: Memory set switch is OFF
SLIDE POS	Seat sliding position/MIN: -4096, MAX: 4096	Within range from -4096 to 4096
RECLIN POS	Seatback position/MIN: -4096, MAX: 4096	Within range from -4096 to 4096
F VTCL POS	Seat front vertical position/MIN: -4096 MAX: 4096	Within range from -4096 to 4096
LIFTER POS	Seat lifter position/MIN: -4096 MAX: 4096	Within range from -4096 to 4096
MEM M1 SW	Driving position memorized with seat memory switch M1/MEM or NOT MEM	MEM: Memorized
MEM M1 SW	Driving position memorized with seat memory switch M1/MEM or NOT MEM	NOT MEM: Not memorized
EM M2 SW	Driving position memorized with seat memory switch M2/MEM or NOT MEM	MEM: Memorized
EM M2 SW	Driving position memorized with seat memory switch M2/MEM or NOT MEM	NOT MEM: Not memorized
SEAT MEM M1	Seat position memorized with seat memory switch M1/MEM or NOT MEM	MEM: Memorized
SEAT MEM M1	Seat position memorized with seat memory switch M1/MEM or NOT MEM	NOT MEM: Not memorized
SEAT MEM M2	Seat position memorized with seat memory switch M2/MEM or NOT MEM	MEM: Memorized
SEAT MEM M2	Seat position memorized with seat memory switch M2/MEM or NOT MEM	NOT MEM: Not memorized
D-MIRR MEM1	Driver side mirror position memorized with seat memory switch M1/MEM or NOT MEM	MEM: Memorized
D-MIRR MEM1	Driver side mirror position memorized with seat memory switch M1/MEM or NOT MEM	NOT MEM: Not memorized
D-MIRR MEM2	Driver side mirror position memorized with seat memory switch M2/MEM or NOT MEM	MEM: Memorized
D-MIRR MEM2	Driver side mirror position memorized with seat memory switch M2/MEM or NOT MEM	NOT MEM: Not memorized
P-MIRR MEM M1	Passenger side mirror position memorized with seat memory switch M1/MEM or NOT MEM	MEM: Memorized
P-MIRR MEM M1	Passenger side mirror position memorized with seat memory switch M1/MEM or NOT MEM	NOT MEM: Not memorized
P-MIRR MEM M2	Passenger side mirror position memorized with seat memory switch M2/MEM or NOT MEM	MEM: Memorized
P-MIRR MEM M2	Passenger side mirror position memorized with seat memory switch M2/MEM or NOT MEM	NOT MEM: Not memorized
SLIDE MEM POS 1	Seat sliding position memorized with seat memory switch M1/MIN: -4096, MAX: 4096	Within range from -4096 to 4096
RECLIN MEM POS 1	Seatback position memorized with seat memory switch M1/MIN: -4096, MAX: 4096	Within range from -4096 to 4096
F VTCL MEM POS 1	Front vertical position memorized with seat memory switch M1/MIN: -4096, MAX: 4096	Within range from -4096 to 4096
LIFTER MEM POS 1	Lifter position memorized with seat memory switch M1/MIN: -4096, MAX: 4096	Within range from -4096 to 4096
SLIDE MEM POS 2	Seat sliding position memorized with seat memory switch M2/MIN: -4096, MAX: 4096	Within range from -4096 to 4096
RECLIN MEM POS 2	Seatback position memorized with seat memory switch M2/MIN: -4096, MAX: 4096	Within range from -4096 to 4096
F VTCL MEM POS 2	Front vertical position memorized with seat memory switch M2/MIN: -4096, MAX: 4096	Within range from -4096 to 4096
LIFTER MEM POS 2	Lifter position memorized with seat memory switch M2/MIN: -4096, MAX: 4096	Within range from -4096 to 4096
D-MIRR MEM POS 1	Driver side mirror position memorized with seat memory switch M1/MIN: 0, MAX: 65535	Within range from 0 to 65535
P-MIRR MEM POS 1	Passenger side mirror position memorized with seat memory switch. M1/MIN: 0, MAX: 65535	Within range from 0 to 65535
D-MIRR MEM POS 2	Driver side mirror position memorized with seat memory switch M2/MIN: 0, MAX: 65535	Within range from 0 to 65535
P-MIRR MEM POS 2	Passenger side mirror position memorized with seat memory switch M2/MIN: 0, MAX: 65535	Within range from 0 to 65535

ACTIVE TEST
HINT:

Performing the ACTIVE TEST using the hand-held tester allows you to operate the seat motors without parts removal. Performing the ACTIVE TEST 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. Perform the ACTIVE TEST according to the display on the tester.
  Standard: Position control ECU & switch assy
  
  Fig 2: Active Test - Position Control ECU & Switch Assy Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002