DESCRIPTION
When the position control ECU and switch assembly does not receive a sensor signal
despite upward or downward movement of the seat by power seat motor operation, this
DTC is stored.
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DTC Code
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DTC Detection Condition
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Trouble Area
|
|
B2653
|
The upward and downward lock detection position of the sensor is the
same.
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- Position control ECU and switch assembly
- Front seat cushion frame sub-assembly RH (lifter motor)
- Harness or connector
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WIRING DIAGRAM
PROCEDURE
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1.
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PERFORM ACTIVE TEST USING TECHSTREAM (LIFTER OPERATION)
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(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Driver Seat / Active Test.
(e) Perform the Active Test according to the display on the Techstream.
Driver Seat
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Tester Display
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Test Part
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Control Range
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Diagnostic Note
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Lifter Operation
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Seat lifter operation
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Up / OFF / Down
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-
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OK:
Motor operates normally.
| NG |
 |
GO TO STEP 5
|
| OK |
|
|
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2.
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CHECK POSITION CONTROL ECU AND SWITCH ASSEMBLY (LIFTER MOTOR CIRCUIT)
|
|
(a) Disconnect the front seat cushion frame sub-assembly LH (lifter motor)
connector.
|
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
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Tester Connection
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Switch Condition
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Specified Condition
|
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Z4-3 - Z4-4
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Lifter switch on
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4.8 to 5.1 V
|
Text in Illustration
|
*a
|
Front view of wire harness connector
(to Front Seat Cushion Frame Sub-assembly [Lifter Motor])
|
| NG |
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GO TO STEP 4
|
| OK |
|
|
|
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3.
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CHECK FRONT SEAT CUSHION FRAME SUB-ASSEMBLY LH (LIFTER MOTOR)
|
|
(a) Reconnect the front seat cushion frame sub-assembly LH (lifter motor)
connector.
|
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection
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Switch Condition
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Specified Condition
|
|
Z4-4 - Body ground
|
Lifter switch on
|
4.5 to 4.8 V
|
Text in Illustration
|
*a
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Component with harness connected
(Front Seat Cushion Frame Sub-assembly LH [Lifter Motor])
|
| OK |
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REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY
|
| NG |
|
REPLACE FRONT SEAT CUSHION FRAME SUB-ASSEMBLY LH
|
|
4.
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CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY
- FRONT SEAT CUSHION FRAME SUB-ASSEMBLY LH)
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(a) Disconnect the Z10 position control ECU and switch assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
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Tester Connection
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Condition
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Specified Condition
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Z10-4 (SSRL) - Z4-4
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Always
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Below 1 Ω
|
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Z10-1 (SGND) - Z4-3
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Always
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Below 1 Ω
|
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Z10-4 (SSRL) or Z4-4 - Body ground
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Always
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10 kΩ or higher
|
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Z10-1 (SGND) or Z4-3 - Body ground
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Always
|
10 kΩ or higher
|
| OK |
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REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY
|
| NG |
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REPAIR OR REPLACE HARNESS OR CONNECTOR
|
|
5.
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INSPECT FRONT SEAT CUSHION FRAME SUB-ASSEMBLY LH (LIFTER MOTOR)
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(a) Remove the front seat cushion frame sub-assembly LH (lifter motor) (See page
 ).
(b) Inspect the front seat cushion frame sub-assembly LH (lifter motor) (See
page ).
| NG |
|
REPLACE FRONT SEAT CUSHION FRAME SUB-ASSEMBLY LH
|
| OK |
|
|
|
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6.
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CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY
- FRONT SEAT CUSHION FRAME SUB-ASSEMBLY LH)
|
(a) Disconnect the Z9 position control ECU and switch assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
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Tester Connection
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Condition
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Specified Condition
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Z9-10 (LFT+) - Z4-1
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Always
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Below 1 Ω
|
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Z9-12 (LFT-) - Z4-2
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Always
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Below 1 Ω
|
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Z9-10 (LFT+) or Z4-1 - Body ground
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Always
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10 kΩ or higher
|
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Z9-12 (LFT-) or Z4-2 - Body ground
|
Always
|
10 kΩ or higher
|
| OK |
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REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
| 
