B2402

LIGHTING: LIGHTING SYSTEM: B2402: Transistor Relay Overload Malfunction
B2402 - Transistor Relay Overload Malfunction

DESCRIPTION

The electric current flowing in the transistor inside the junction block is examined by the rear multiplex network 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 power 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.





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch ON (IG) and turn the Techstream on.

(c) Select the items below in the DATA LIST, and read the displays on the Techstream.

Body No. 4 (Rear multiplex network ECU)





OK:

Condition value will be displayed.

OK -- NORMAL OPERATION, NOT A MALFUNCTION
NG -- Continue to next step.

2. CHECK WIRE HARNESS (REAR MULTIPLEX NETWORK ECU)

(a) Check each circuit in the table below.





OK:

Each light illuminates.

OK -- REPLACE REAR MULTIPLEX NETWORK ECU