DTC B265B: Lumbar Support Sensor Circuit [09/2014 - ]: Procedure

1. Check the parts which the DTCs have been output from (Refer to DTC CHECK / CLEAR [09/2014 - ] ).
   RESULT
   
   

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

Result: 

B 

See step  8

Result: 

A 

See step  2

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.

Result: 

NG 

See step  6

Result: 

OK 

See step  3

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])

Result: 

NG 

See step  5

Result: 

OK 

See step  4

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])

Result: 

A 

REPLACE POSITION CONTROL ECU ASSEMBLY 

(Refer to REMOVAL [09/2014 - ] )

Result: 

B 

REPLACE POSITION CONTROL ECU ASSEMBLY 

(Refer to REMOVAL [09/2014 - ] )

Result: 

C 

REPLACE LUMBAR SUPPORT ADJUSTER ASSEMBLY LH (LUMBAR MOTOR) 

(Refer to REMOVAL [09/2014 - ] )

Result: 

D 

REPLACE LUMBAR SUPPORT ADJUSTER ASSEMBLY LH (LUMBAR MOTOR) 

(Refer to REMOVAL [09/2014 - ] )

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

Result: 

A 

REPLACE POSITION CONTROL ECU ASSEMBLY 

(Refer to REMOVAL [09/2014 - ] )

Result: 

B 

REPLACE POSITION CONTROL ECU ASSEMBLY 

(Refer to REMOVAL [09/2014 - ] )

Result: 

C 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

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])

Result: 

B 

REPLACE LUMBAR SUPPORT ADJUSTER ASSEMBLY LH (LUMBAR MOTOR) 

(Refer to REMOVAL [09/2014 - ] )

Result: 

C 

REPLACE LUMBAR SUPPORT ADJUSTER ASSEMBLY LH (LUMBAR MOTOR) 

(Refer to REMOVAL [09/2014 - ] )

Result: 

A 

See step  7

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

Result: 

A 

REPLACE POSITION CONTROL ECU ASSEMBLY 

(Refer to REMOVAL [09/2014 - ] )

Result: 

B 

REPLACE POSITION CONTROL ECU ASSEMBLY 

(Refer to REMOVAL [09/2014 - ] )

Result: 

C 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

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.

Result: 

NG 

See step  12

Result: 

OK 

See step  9

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])

Result: 

NG 

See step  11

Result: 

OK 

See step  10

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])

Result: 

OK 

REPLACE POSITION CONTROL ECU ASSEMBLY 

(Refer to REMOVAL [09/2014 - ] )

Result: 

NG 

REPLACE LUMBAR SUPPORT ADJUSTER ASSEMBLY RH (LUMBAR MOTOR) 

(Refer to REMOVAL [09/2014 - ] )

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

Result: 

OK 

REPLACE POSITION CONTROL ECU ASSEMBLY 

(Refer to REMOVAL [09/2014 - ] )

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

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])

Result: 

NG 

REPLACE LUMBAR SUPPORT ADJUSTER ASSEMBLY RH (LUMBAR MOTOR) 

(Refer to REMOVAL [09/2014 - ] )

Result: 

OK 

See step  13

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

Result: 

OK 

REPLACE POSITION CONTROL ECU ASSEMBLY 

(Refer to REMOVAL [09/2014 - ] )

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR