DTC B2557: Motor Lock in Roof Drive Motor(LH): Procedure

1. Remove the sliding roof drive gear assembly LH (roof motor LH).
   Fig 1: Identifying Sliding Roof Drive Gear Assembly LH (Roof Motor LH)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Apply battery voltage and check operation of the roof motor.

   OK

   Measurement Condition	Specified Condition
   Battery positive (+) → 4 (RML+) Battery negative (-) → 8 (RML-)	Motor gear rotates clockwise
   Battery positive (+) → 8 (RML-) Battery negative (-) → 4 (RML+)	Motor gear rotates counterclockwise

3. Connect an electrical tester DC 400 A probe to the wire harness of the motor.
   NOTE:

   Match the arrow mark of the probe with the direction of the current flow.

4. Measure the current according to the value(s) in the table below.
   NOTE:

   Make sure to perform the inspection after the motor cools down sufficiently. Otherwise the result may not meet the specified condition due to protection circuit operation in the motor.

   Standard Current

   Measurement Condition	Specified Condition
   Battery positive (+) → 8 (RML-) Battery negative (-) → 4 (RML+)	Below 5 A

   TEXT IN ILLUSTRATION
   
   

   *1	Component without harness connected (Sliding Roof Drive Gear Assembly LH)
   *2	Motor Gear
   *3	Clockwise
   *4	Counterclockwise

NG → REPLACE SLIDING ROOF DRIVE GEAR ASSEMBLY LH (ROOF MOTOR LH) 

OK → REPLACE SLIDING ROOF CONTROL ECU ASSEMBLY