DTC B265B: Lumbar Support Sensor Circuit: Procedure

1. Check the parts which the DTCs have been output from. Refer to DTC CHECK / CLEAR [12/2011 - ] .
   RESULT
   
   

   Result	Proceed to
   DTC output from "Driver Seat"	A
   DTC output from "Passenger Seat"	B

B → See step   8 

A: Go to next step 

1. Turn the engine switch off.
2. Connect the Techstream to the DLC3.
3. Turn the engine switch on (IG).
4. Turn the Techstream on.
5. Enter the following menus: Body Electrical / Driver Seat / Active Test.
6. Perform the Active Test according to the display on the Techstream.
   DRIVER SEAT
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   Lumbar Slide	Lumbar sliding operation	Front / OFF / Rear	-

   OK

   Motor operates normally.

NG → See step   6 

OK: Go to next step 

1. Disconnect the lumbar motor connector.

   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
   d31-2 (VCC) - d31-3 (GND)	Lumbar switch on	4.8 to 5.1 V

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Lumbar Support Adjuster Assembly LH [Lumbar Motor])

NG → See step   5 

OK: Go to next step 

1. Reconnect the lumbar motor connector.

   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
   d31-2 (VCC) - Body ground	Lumbar switch on	4.5 to 4.8 V

   RESULT
   
   

   Result	Proceed to
   OK (for Sports Seat Type)	A
   OK (for Luxury Seat Type)	B
   NG (for Sports Seat Type)	C
   NG (for Luxury Seat Type)	D

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (Lumbar Support Adjuster Assembly LH [Lumbar Motor])

B → See step   15 

C → See step   16 

D → See step   17 

A → See step   14 

1. Disconnect the d4 and d5 position control ECU assembly connectors.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   d4-13 (SSLB) - d31-2 (VCC)	Always	Below 1 Ω
   d5-20 (SGND) - d31-3 (GND)	Always	Below 1 Ω
   d4-13 (SSLB) - Body ground	Always	10 kΩ or higher
   d5-20 (SGND) - Body ground	Always	10 kΩ or higher

   RESULT
   
   

   Result	Proceed to
   OK (for Sports Seat Type)	A
   OK (for Luxury Seat Type)	B
   NG	C

B → See step   15 

C → REPAIR OR REPLACE HARNESS OR CONNECTOR 

A → See step   14 

1. Disconnect the d31 lumbar motor connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Check if the lumbar motor moves smoothly when the battery is connected to the lumbar motor connector terminals.

   OK

   Measurement Condition	Operational Direction
   Battery positive (+) → 1 (H) Battery negative (-) → 4 (R)	Forward
   Battery positive (+) → 4 (R) Battery negative (-) → 1 (H)	Backward

   RESULT
   
   

   Result	Proceed to
   OK	A
   NG (for Sports Seat Type)	B
   NG (for Luxury Seat Type)	C

   TEXT IN ILLUSTRATION
   
   

   *a	Component without harness connected (Lumbar Support Adjuster Assembly LH [Lumbar Motor])

B → See step   16 

C → See step   17 

A: Go to next step 

1. Disconnect the d4 and d5 position control ECU switch assembly connectors.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   d4-5 (L+) - d31-1 (H)	Always	Below 1 Ω
   d5-3 (L-) - d31-4 (R)	Always	Below 1 Ω
   d4-5 (L+) - Body ground	Always	10 kΩ or higher
   d5-3 (L-) - Body ground	Always	10 kΩ or higher

   RESULT
   
   

   Result	Proceed to
   OK (for Sports Seat Type)	A
   OK (for Luxury Seat Type)	B
   NG	C

B → See step   15 

C → REPAIR OR REPLACE HARNESS OR CONNECTOR 

A → See step   14 

1. Turn the engine switch off.
2. Connect the Techstream to the DLC3.
3. Turn the engine switch on (IG).
4. Turn the Techstream on.
5. Enter the following menus: Body Electrical / Passenger Seat / Active Test.
6. Perform the Active Test according to the display on the Techstream.
   PASSENGER SEAT
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   Lumbar Slide	Lumbar sliding operation	Front / OFF / Rear	-

   OK

   Motor operates normally.

NG → See step   12 

OK: Go to next step 

1. Disconnect the lumbar motor connector.

   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
   c26-2 (VCC) - d26-3 (GND)	Lumbar switch on	4.8 to 5.1 V

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Lumbar Support Adjuster Assembly RH [Lumbar Motor])

NG → See step   11 

OK: Go to next step 

1. Reconnect the lumbar motor connector.

   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
   c26-2 (VCC) - Body ground	Lumbar switch on	4.5 to 4.8 V

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (Lumbar Support Adjuster Assembly RH [Lumbar Motor])

NG → See step   18 

OK → See step   15 

1. Disconnect the c2 and c3 position control ECU assembly connectors.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   c3-13 (SSLB) - c26-2 (VCC)	Always	Below 1 Ω
   c2-20 (SGND) - c26-3 (GND)	Always	Below 1 Ω
   c3-13 (SSLB) - Body ground	Always	10 kΩ or higher
   c2-20 (SGND) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   15 

1. Disconnect the c26 lumbar motor connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Check if the lumbar motor moves smoothly when the battery is connected to the lumbar motor connector terminals.

   OK

   Measurement Condition	Operational Direction
   Battery positive (+) → 1 (H1) Battery negative (-) → 4 (R1)	Forward
   Battery positive (+) → 4 (R1) Battery negative (-) → 1 (H1)	Backward

   TEXT IN ILLUSTRATION
   
   

   *a	Component without harness connected (Lumbar Support Adjuster Assembly RH [Lumbar Motor])

NG → See step   18 

OK: Go to next step 

1. Disconnect the c2 and c3 position control ECU assembly connectors.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   c3-5 (L+) - c26-1 (H1)	Always	Below 1 Ω
   c2-3 (L-) - c26-4 (R1)	Always	Below 1 Ω
   c3-5 (L+) - Body ground	Always	10 kΩ or higher
   c2-3 (L-) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   15