Driver Side Power Seat Motor Circuit
Circuit diagnosis
DESCRIPTION
When the power seat control switch is operated, a command signal is sent to the front power seat switch (position control ECU). The front power seat switch (position control ECU) then controls the appropriate seat motor as needed. This memory system does not use a seat position sensor. The seat position is detected by counting pulses that are output when the motor turns. If there is no pulse output from the motor, the motor will stop operating. The front power seat switch (position control ECU) is designed so that any malfunction of the seat memory system will not interfere with manual seat control.If the front power seat switch (position control ECU) detects a low motor speed, abnormal activity, or sudden motor current fluctuation, the system will stop the motor. If the motor operates continuously for 120 seconds or more, the system will stop the motor until the switch is turned on again.
WIRING DIAGRAM
INSPECTION PROCEDURE
| 1. PERFORM ACTIVE TEST BY INTELLIGENT TESTER (FRONT POWER SEAT SWITCH LH (POSITION CONTROL ECU)) |
Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG).
Perform the ACTIVE TEST by following the directions on the tester screen.
SEAT: Item
Test Details
Diagnostic Note
Seat Reclining
Seat reclining operation FRONT / REAR
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Front Vertical Operation
Seat front vertical operation UP / DOWN
-
Lifter Operation
Seat lifer operation UP / DOWN
-
Seat Slide Operation
Seat sliding operation FRONT / REAR
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- OK:
- Each power seat motor operates.
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| OK | ||
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| 2. INSPECT FRONT SEAT ADJUSTER SUB-ASSEMBLY (POWER SEAT MOTOR) |
Inspect the power seat motor (Click here).
- OK:
- The power seat motor operates.
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| OK | |
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| 3. CHECK WIRE HARNESS (FRONT POWER SEAT SWITCH - POWER SEAT MOTOR) |
LHD
Disconnect the front power seat switch LH (position control ECU) connector and power seat motor connectors.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
Tester Connection
Condition
Specified Condition
U6-2 (SLD+) - U2-1
Always
Below 1 Ω
U6-3 (SLD-) - U2-2
Always
Below 1 Ω
U6-4 (FRV-) - U8-2
Always
Below 1 Ω
U6-6 (FRV+) - U8-1
Always
Below 1 Ω
U6-7 (LFT+) - U9-2
Always
Below 1 Ω
U6-9 (LFT-) - U9-1
Always
Below 1 Ω
U6-8 (RCL+) - U5-2
Always
Below 1 Ω
U6-10 (RCL-) - U5-1
Always
Below 1 Ω
U6-2 (SLD+) - Body ground
Always
10 kΩ or higher
U6-3 (SLD-) - Body ground
Always
10 kΩ or higher
U6-4 (FRV-) - Body ground
Always
10 kΩ or higher
U6-6 (FRV+) - Body ground
Always
10 kΩ or higher
U6-7 (LFT+) - Body ground
Always
10 kΩ or higher
U6-9 (LFT-) - Body ground
Always
10 kΩ or higher
U6-8 (RCL+) - Body ground
Always
10 kΩ or higher
U6-10 (RCL-) - Body ground
Always
10 kΩ or higher
RHD
Disconnect the front power seat switch RH (position control ECU) connector and power seat motor connectors.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
Tester Connection
Condition
Specified Condition
T6-2 (SLD+) - T1-2
Always
Below 1 Ω
T6-3 (SLD-) - T1-1
Always
Below 1 Ω
T6-4 (FRV-) - T4-1
Always
Below 1 Ω
T6-6 (FRV+) - T4-2
Always
Below 1 Ω
T6-7 (LFT+) - T5-1
Always
Below 1 Ω
T6-9 (LFT-) - T5-2
Always
Below 1 Ω
T6-8 (RCL+) - T9-2
Always
Below 1 Ω
T6-10 (RCL-) - T9-1
Always
Below 1 Ω
T6-2 (SLD+) - Body ground
Always
10 kΩ or higher
T6-3 (SLD-) - Body ground
Always
10 kΩ or higher
T6-4 (FRV-) - Body ground
Always
10 kΩ or higher
T6-6 (FRV+) - Body ground
Always
10 kΩ or higher
T6-7 (LFT+) - Body ground
Always
10 kΩ or higher
T6-9 (LFT-) - Body ground
Always
10 kΩ or higher
T6-8 (RCL+) - Body ground
Always
10 kΩ or higher
T6-10 (RCL-) - Body ground
Always
10 kΩ or higher
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| OK | ||
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