DTC B235B-18: Power Distribution Box Circuit Current Below Threshold [11/2023 - ]: Procedure

1. Clear the DTCs.

   Body Electrical > Power Distribution Box > Clear DTCs 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  2

1. Turn the rear window defogger switch ON.
2. Check for DTCs.

   Body Electrical > Power Distribution Box > Trouble Codes 

   Result

   Result	Proceed to
   B235B-18 is output	A
   B235B-18 is not output	B

Result: 

B 

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

Result: 

A 

See step  3

1. Disconnect the cable from the negative (-) auxiliary battery terminal.
2. Disconnect the 8G power distribution box assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Power Distribution Box Assembly)

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   8G-43 - Body ground	Always	Below 10 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE POWER DISTRIBUTION BOX ASSEMBLY. Refer to  REMOVAL [11/2023 - ] 

Result: 

NG 

See step  4

1. Disconnect the W2 back door glass (rear window defogger wire) connector.
2. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Power Distribution Box Assembly)
   *b	Front view of wire harness connector (to Back Door Glass (Rear Window Defogger Wire))

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   8G-43 - W2-1 (B)	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  5

1. Disconnect the W3 back door glass (rear window defogger wire) connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   W3-1 (E) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE BACK DOOR GLASS (REAR WINDOW DEFOGGER WIRE). Refer to  REMOVAL [12/2019 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR