DTC B2402: Transistor Relay Overload Malfunction: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Select the items below in the DATA LIST, and read the displays on the Techstream.
   BODY NO. 4 (MULTIPLEX NETWORK REAR ECU):
   
   

   Item	Measurement Item / Display (Range)	Normal Condition	Diagnostic Note
   Tail Light Tr	Taillight Transistor / ON or OFF	ON: Light control switch TAIL or HEAD position OFF: Light control switch other than HEAD position	-
   Stop Light Tr	Stop light Transistor / ON or BREAK	ON: Brake pedal depressed OFF: Brake pedal released	-
   High Mount Stop Light Tr	High mount stop light Transistor / ON or BREAK	ON: Brake pedal depressed BREAK: Brake pedal released	-
   License Light Tr	License LGT Transistor / ON or BREAK	ON: Light control switch TAIL position BREAK: Light control switch other than HEAD position	-

   OK

   Condition sign can be displayed.

NG → See step   2 

OK → NORMAL OPERATION, NOT A MALFUNCTION 

1. Check each circuit in the table below.

   Suspected Area	See procedure
   Taillight	Refer to Taillight Circuit
   Stop light	Refer to Stop Light Circuit
   Back-up light	Refer to Back-up Light Circuit

   OK

   Each light illuminates.

OK → REPLACE MULTIPLEX NETWORK REAR ECU (LUGGAGE ROOM JUNCTION BLOCK ECU)