DTC B1523: DCU GVIF Disconnected (from D-SEAT SW to Multi Display) [12/2019 - 10/2022]: Procedure

1. Clear the DTCs.

   Body Electrical > D-SEAT SW > Clear DTCs 

2. Recheck for DTCs and check that no DTCs are output.

   Body Electrical > D-SEAT SW > Trouble Codes 

   OK

   No DTCs are output.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - ] 

Result: 

NG 

See step  2

1. Disconnect the b2 integration control sub-assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Integration Control Sub-assembly)
   *b	Front view of wire harness connector (to Radio Receiver Assembly)

2. Disconnect the d7 radio receiver assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   b2-1 (GV+) - d7-1 (GVI+)	Always	Below 1 Ω
   b2-2 (GV-) - d7-2 (GVI-)	Always	Below 1 Ω
   b2-3 (GVG) - d7-3 (GVG1)	Always	Below 1 Ω
   b2-1 (GV+) or d7-1 (GVI+) - Body ground	Always	10 kΩ or higher
   b2-2 (GV-) or d7-2 (GVI-) - Body ground	Always	10 kΩ or higher
   b2-3 (GVG) or d7-3 (GVG1) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

1. Replace the integration control sub-assembly with a new one.
2. Clear the DTCs.

   Body Electrical > D-SEAT SW > Clear DTCs 

3. Recheck for DTCs and check that no DTCs are output.

   Body Electrical > D-SEAT SW > Trouble Codes 

   OK

   No DTCs are output.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

END (MULTI-DISPLAY ASSEMBLY IS DEFECTIVE) 

Result: 

NG 

REPLACE MULTI-DISPLAY ASSEMBLY. Refer to  REMOVAL [12/2019 - 10/2022]