DTC    B2402    Transistor Relay Overload Malfunction

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DESCRIPTION

The electric current flowing in the transistor inside the Junction Block is examined by the Multiplex Network Rear ECU (Luggage room Junction Block ECU).
When excessive current is detected, DTC B2402 is output.
When overheating occurs prior to an excessive current, the ECU cuts off the current in the transistor to prevent it from being damaged and outputs DTC B2403.
Normally, turning off the engine switch clears DTC.
However, if an excessive current is detected frequently (9 times or more), DTC may not be cleared.
When this happens, disconnect the cable from the negative (-) battery terminal to clear DTC.

DTC No.
DTC Detection Condition
Trouble Area
B2402
Transistor relay overload malfunction
  1. Multiplex network rear ECU
  2. Wire harness or connector

HINT:
When "B2403" is output, "B2402" is also output.


INSPECTION PROCEDURE

1.READ VALUE OF INTELLIGENT TESTER

  1. Connect the intelligent tester to the DLC3.

  1. Turn the engine switch on (IG) and press the intelligent tester main switch on.

  1. Select the items below in the Data List, and read the displays on the intelligent tester.


Multiplex network rear ECU 
Item
Measurement Item / Display (Range)
Normal Condition
Diagnostic Note
Tail Light Tr
Taillight transistor / OK or BREAK
ON or OFF
-
Stop Light Tr
Stop light transistor transistor / OK or BREAK
ON or OFF
-
High Mount Stop Light Tr
High mount stop Light transistor / OK or BREAK
ON or BREAK
-
License light Tr
License light transistor / OK or BREAK
ON or BREAK
-

OK:
Condition sign can be displayed.



NG
Go to step 2
OK

NORMAL OPERATION, NOT A MALFUNCTION 

2.CHECK WIRE HARNESS (MULTIPLEX NETWORK REAR ECU)

  1. Check each circuit in the table below.


Suspected Area
See Page
Taillight
 Click here
Stop light
 Click here
Back-up light
 Click here

OK:
Each light illuminates.



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

REPLACE MULTIPLEX NETWORK REAR ECU