DTC B1273: Sliding Roof ECU Communication Stop: Procedure

1. Remove the S/ROOF fuse from the main body ECU LH (cowl side junction block LH).
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   S/ROOF fuse	Always	Below 1 Ω

NG → REPLACE FUSE (S/ROOF) 

OK: Go to next step 

1. Disconnect the R6 connector.
   Fig 1: Identifying R6 Connector Terminal

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   R6-5 (B) - Body ground	Always	11 to 14 V

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   R6-7 (E) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (SLIDING ROOF CONTROL ECU - BATTERY AND BODY GROUND) 

OK: Go to next step 

1. Disconnect the R6 and R5 connectors.
   Fig 2: Identifying R6 And R5 Connector Terminal

   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
   R6-10 (MPX1) - R5-38 (MPX2)	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the R5, J55 and 2F connectors.
   Fig 3: Identifying R5, J55 And 2F Connector Terminal

   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
   R5-36 (MPX) - J55-24 (MPX2) or 2F-5 (MPX1)	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   5