DTC B131A: Position Initialization Incomplete; DTC B131E: Motor Circuit [03/2017 - ]: Procedure

1. Check that no foreign objects are restricting active rear wing operation.

   OK

   No foreign objects.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REMOVE FOREIGN OBJECT 

Result: 

OK 

See step  2

1. Disconnect the X79 spoiler control ECU assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Spoiler Control ECU Assembly)

2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   X79-19 (B) - X79-1 (GND)	Always	11 to 14 V

   Result

   Result
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

1. Disconnect the d2 rear spoiler motor assembly connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   X79-6 (RSM+) - d2-1 (U)	Always	Below 1 Ω
   X79-6 (RSM+) or d2-1 (U) - Body ground	Always	10 kΩ or higher
   X79-7 (RSM-) - d2-5 (D)	Always	Below 1 Ω
   X79-7 (RSM-) or d2-5 (D) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Remove the active rear wing assembly.

   Refer to REMOVAL [03/2017 - ]

2. Visually check the top cover lock control link sub-assembly LH, top cover lock control link sub-assembly RH and rear spoiler drive gear for damage or deformation.

   HINT: 

   To visually check the top cover lock control link sub-assembly LH and top cover lock control link sub-assembly RH, it is necessary to remove the rear spoiler cover LH and rear spoiler cover RH.

   Refer to DISASSEMBLY [03/2017 - ]

   Result

   Result	Proceed to
   No damage or deformation	A
   Top cover lock control link sub-assembly LH is damaged or deformed	B
   Top cover lock control link sub-assembly RH is damaged or deformed	C
   Rear spoiler drive gear is damaged or deformed	D

Result: 

B 

REPLACE TOP COVER LOCK CONTROL LINK SUB-ASSEMBLY LH. Refer to  DISASSEMBLY [03/2017 - ] 

Result: 

C 

REPLACE TOP COVER LOCK CONTROL LINK SUB-ASSEMBLY RH. Refer to  DISASSEMBLY [03/2017 - ] 

Result: 

D 

REPLACE REAR SPOILER DRIVE GEAR. Refer to  DISASSEMBLY [03/2017 - ] 

Result: 

A 

See step  5

1. Remove the rear spoiler motor assembly.

   Refer to DISASSEMBLY [03/2017 - ]

2. Inspect the rear spoiler motor assembly.

   Refer to INSPECTION [03/2017 - ]

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE SPOILER CONTROL ECU ASSEMBLY. Refer to  REMOVAL [03/2017 - 05/2023]  , or refer to  REMOVAL [05/2023 - ] 

Result: 

NG 

REPLACE REAR SPOILER MOTOR ASSEMBLY. Refer to  DISASSEMBLY [03/2017 - ]