DTC B253B: Back Window Panel Lock Switch Abnormal Operation: 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 / Retractable Hardtop / Data List.
5. Read the Data List according to the display on the Techstream.
   RETRACTABLE HARDTOP (SLIDING ROOF CONTROL ECU ASSEMBLY)
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Back Window Panel Lock SW	Roof rear lock switch signal/ON or OFF	ON: Roof rear lock switch on (back window lock locked) OFF: Roof rear lock switch off (back window panel not fully closed)	-

   OK

   The Techstream display changes according to condition as shown in the table.

NG → See step   2 

OK → REPLACE SLIDING ROOF CONTROL ECU ASSEMBLY 

1. Check that the wire harness of the roof rear lock switch has not been pinched by the body.
2. Disconnect the f2 connector.
   Fig 1: Identifying F2 Connector

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

   HINT: 

   Check that the sliding roof drive gear sub-assembly does not stick or bind when it is rotated.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3 (R3LL) - 4 (R3LE)	Sliding roof drive gear sub-assembly (roof rear lock motor) rotates counterclockwise	10 kΩ or higher
   3 (R3LL) - 4 (R3LE)	Sliding roof drive gear sub-assembly (roof rear lock motor) rotates clockwise	Below 1 Ω
   3 (R3LL) - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Component without harness connected (Back Window Lock Assembly)
   *2	Back Window Lock Assembly
   *3	Clockwise
   *4	Counterclockwise

NG → REPLACE BACK WINDOW LOCK ASSEMBLY (ROOF REAR LOCK SWITCH) 

OK: Go to next step 

1. Disconnect the f2 and Q35 connectors.
   Fig 2: Identifying F2 & Q35 Connectors

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   f2-3 (R3LL) - Q35-17 (R3LL)	Always	Below 1 Ω
   f2-3 (R3LL) - Body ground	Always	10 kΩ or higher
   f2-4 (R3LE) - Body ground	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Back Window Lock Assembly)
   *2	Front view of wire harness connector (to Sliding Roof Control ECU Assembly)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the f1 and f2 connectors.
   Fig 3: Identifying F1 & F2 Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Apply battery voltage to the motor and measure the resistance according to the value(s) in the table below.
   NOTE:

   Disconnect the battery immediately after the back window lock operation stops.

   HINT: 

   Apply battery voltage to the motor and measure the resistance when the motor stops rotating.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3 (R3LL) - 4 (R3LE)	Battery positive (+) → 1 (3LM+) Battery negative (-) → 2 (3LM-)	Below 1 Ω
   3 (R3LL) - 4 (R3LE)	Battery positive (+) → 2 (3LM-) Battery negative (-) → 1 (3LM+)	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Component without harness connected (Back Window Lock Assembly)
   *2	Component without harness connected (Sliding Roof Drive Gear Sub-assembly)

NG → REPLACE BACK WINDOW LOCK ASSEMBLY 

OK → REPLACE SLIDING ROOF CONTROL ECU ASSEMBLY