DTC B254F: Unequal RH and LH Back Window Panel Pulse Sensor values Malfunction: Procedure

1. Disconnect the P57, Q41, P53 and Q35 connectors.
   Fig 1: Identifying P57, Q41, P53 & Q35 Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Slide Roof Motor Assembly)	*2	Front view of wire harness connector (to Slide Roof Motor Assembly)
   *3	Front view of wire harness connector (to Sliding Roof Control ECU Assembly)	-	-

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   P57-3 (R3RB) - P53-28 (R3RB)	Always	Below 1 Ω
   P57-6 (R3R) - P53-16 (R3R)	Always	Below 1 Ω
   P57-7 (R3RE) - P53-32 (R3RE)	Always	Below 1 Ω
   Q41-3 (R3LB) - Q35-16 (R3LB)	Always	Below 1 Ω
   Q41-6 (R3L) - Q35-14 (R3L)	Always	Below 1 Ω
   Q41-7 (R3LE) - Q35-13 (R3LE)	Always	Below 1 Ω
   P53-28 (R3RB) - Body ground	Always	10 kΩ or higher
   P53-16 (R3R) - Body ground	Always	10 kΩ or higher
   P53-32 (R3RE) - Body ground	Always	10 kΩ or higher
   Q35-16 (R3LB) - Body ground	Always	10 kΩ or higher
   Q35-14 (R3L) - Body ground	Always	10 kΩ or higher
   Q35-13 (R3LE) - Body ground	Always	10 kΩ or higher
   P53-28 (R3RB) - P53-32 (R3RE)	Always	10 kΩ or higher
   P53-16 (R3R) - P53-32 (R3RE)	Always	10 kΩ or higher
   Q35-16 (R3LB) - Q35-13 (R3LE)	Always	10 kΩ or higher
   Q35-14 (R3L) - Q35-13 (R3LE)	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Reconnect the P57 and P53 connectors.
   Fig 2: Identifying P57 & P53 Connectors

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A-5 - A-4	Always	6 to 10 V

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Slide Roof Motor Assembly)

NG → REPLACE SLIDING ROOF CONTROL ECU ASSEMBLY 

OK: Go to next step 

1. Reconnect the Q41 and Q35 connectors.
   Fig 3: Identifying Q41 & Q35 Connectors

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   B-5 - B-4	Always	6 to 10 V

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Slide Roof Motor Assembly)

NG → REPLACE SLIDING ROOF CONTROL ECU ASSEMBLY 

OK: Go to next step 

1. Replace the sliding roof drive gear assembly.

NEXT: Go to next step 

1. Clear the DTC. Refer to DTC CHECK / CLEAR .

NEXT: Go to next step 

1. Operate the retractable hardtop system.
2. Recheck for DTCs. Refer to DTC CHECK / CLEAR .

   OK

   DTC B254F is not output.

NG → See step   7 

OK → END (SLIDING ROOF DRIVE GEAR ASSEMBLY WAS DEFECTIVE) 

1. Replace the sliding roof drive gear assembly.

NEXT: Go to next step 

1. Clear the DTC. Refer to DTC CHECK / CLEAR .

NEXT: Go to next step 

1. Operate the retractable hardtop system.
2. Recheck for DTCs. Refer to DTC CHECK / CLEAR .

   OK

   DTC B254F is not output.

NG → REPLACE SLIDING ROOF CONTROL ECU ASSEMBLY 

OK → END (SLIDING ROOF DRIVE GEAR ASSEMBLY WAS DEFECTIVE)