DTC B2653: Lifter Sensor Malfunction: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Driver Seat / Active Test.
5. According to the display on the Techstream, perform the Active Test.

   Tester Display	Test Part	Control Range	Diagnostic Note
   Lifter Operation	Seat lifter operation	Up / OFF / Down	-

   OK

   Motor operates normally.

NG → See step   5 

OK: Go to next step 

1. Disconnect the Y10 lifter motor connector.
   Fig 1: Checking Y10 Lifter Motor

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   Y10-2 (O/P) - Y10-3 (GND)	Lifter switch on	4.8 to 5.1 V

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Separate Type Front Seat Cushion Spring Assembly LH (Lifter Motor))

3. Reconnect the lifter motor connector.

NG → See step   4 

OK: Go to next step 

1. Measure the voltage according to the value(s) in the table below.
   Fig 2: Checking Separate Type Front Seat Cushion Spring Assembly LH (Lifter Motor)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   Y10-2 (O/P) - Body ground	Lifter switch on	4.5 to 4.8 V

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (Separate Type Front Seat Cushion Spring Assembly LH (Lifter Motor))

NG → See step   7 

OK → See step   8 

1. Disconnect the Y9 front power seat switch LH connector.
2. Disconnect the Y10 lifter motor connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   Y9-4 (SSRL) - Y10-2 (O/P)	Always	Below 1 Ω
   Y9-1 (SGND) - Y10-3 (GND)	Always	Below 1 Ω
   Y9-4 (SSRL) - Body ground	Always	10 kΩ or higher
   Y9-1 (SGND) - Body ground	Always	10 kΩ or higher

4. Reconnect the lifter motor connector.
5. Reconnect the front power seat switch LH connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   9 

1. Remove the separate type front seat cushion spring assembly LH (lifter motor). Refer to DISASSEMBLY .
   Fig 3: Inspecting Separate Type Front Seat Cushion Spring Assembly LH (Lifter Motor)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check if the seat cushion spring moves smoothly when the battery is connected to the lifter motor connector terminals.

   OK

   Measurement Condition	Specified Condition
   Battery positive (+) → 4 (UP) Battery negative (-) → 1 (DOWN)	Upward
   Battery positive (+) → 1 (DOWN) Battery negative (-) → 4 (UP)	Downward

   TEXT IN ILLUSTRATION
   
   

   *a	Component without harness connected (Separate Type Front Seat Cushion Spring Assembly LH (Lifter Motor))

3. Reinstall the separate type front seat cushion spring assembly LH (lifter motor).

NG → See step   10 

OK: Go to next step 

1. Disconnect the Y8 front power seat switch LH connector.
2. Disconnect the Y10 lifter motor connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   Y8-10 (LFT+) - Y10-4 (UP)	Always	Below 1 Ω
   Y8-12 (LFT-) - Y10-1 (DOWN)	Always	Below 1 Ω
   Y8-10 (LFT+) - Body ground	Always	10 kΩ or higher
   Y8-12 (LFT-) - Body ground	Always	10 kΩ or higher

4. Reconnect the lifter motor connector.
5. Reconnect the front power seat switch LH connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   11