DTC B2374-19: Right Door Mirror Heater Circuit Current Above Threshold [11/2023 - ]: Procedure

1. Clear the DTCs.

   Body Electrical > Mirror R > Clear DTCs 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  2

1. Operate the door mirror heater.

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  3

1. Check for DTCs.

   Body Electrical > Mirror R > Trouble Codes 

   Result

   Result	Proceed to
   B2374-19 is output	A
   B2374-19 is not output	B

Result: 

B 

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

Result: 

A 

See step  4

Refer to INSPECTION [12/2019 - ]

Result

Result: 

NG 

REPLACE OUTER MIRROR RH. Refer to  REMOVAL [12/2019 - ] 

Result: 

OK 

See step  5

Pre-procedure1

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the z16 outer mirror control ECU assembly RH connector.
2. Disconnect the G outer mirror RH connector.

   Procedure1

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   z16-4 (+) - G-1 (HTR+)	Always	Below 1 Ω
   z16-12 (-) - G-2 (H/T-)	Always	Below 1 Ω
   z16-4 (+) or G-1 (HTR+) - Body ground	Always	10 kΩ or higher
   z16-12 (-) or G-2 (H/T-) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

   Post-procedure1

4. None

Result: 

OK 

REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY RH. Refer to  REMOVAL [12/2019 - ] 

Result: 

NG 

REPLACE OUTER REAR VIEW MIRROR ASSEMBLY RH. Refer to  INSPECTION [12/2019 - ]