DTC B2321: Driver Side Door ECU Communication Stop: Procedure

1. Clear the DTC. Refer to DTC CHECK / CLEAR .
2. Recheck for DTCs.

   Result

   Result	Proceed to
   Only DTC B2321 is output.	A
   DTC B1206 and B2321 are output simultaneously.	B

   HINT: 

   When DTC B1206 and B2321 are output simultaneously, perform troubleshooting for DTC B1206 first.

B → See step   9 

A: Go to next step 

1. Disconnect the O6 multiplex network master switch connector.
   Fig 1: Identifying Multiplex Network Master Switch And Power Window Regulator Motor Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the O2 power window regulator motor (for driver side) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   O6-16 (LIN2) - O2-9 (LIN)	Always	Below 1 Ω
   O6-16 (LIN2) - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Multiplex Network Master Switch Assembly)
   *2	Front view of wire harness connector (to Power Window Regulator Motor Assembly (for Driver Side))

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Remove the multiplex network master switch assembly. Refer to REMOVAL .
   Fig 2: Inspecting Multiplex Network Master Switch Assembly

   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
   16 (LIN2) - 17 (LIN1)	Always	Below 1 Ω
   16 (LIN2) - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Component without harness connected (Multiplex Network Master Switch Assembly)

NG → See step   7 

OK: Go to next step 

1. Measure the voltage according to the value(s) in the table below.
   Fig 3: Identifying Power Window Regulator Motor Assembly Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   O2-2 (B) - Body ground	Power switch off	11 to 14 V

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   O2-1 (GND) - Body ground	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Power Window Regulator Motor Assembly (for Driver Side))

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Replace the power window regulator motor assembly (for driver side). Refer to REMOVAL .

NEXT: Go to next step 

1. Clear the DTC. Refer to DTC CHECK / CLEAR .
2. Check for DTCs.

   OK

   DTC B2321 is not output.

NG → See step   8 

OK → END (POWER WINDOW REGULATOR MOTOR ASSEMBLY WAS DEFECTIVE)