B2402

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

DESCRIPTION

The electric current flowing in the transistor inside the rear junction block is examined by the rear junction block ECU.

When excessive current is detected, DTC B2402 is output.

Turning OFF the power switch clears the DTC.





WIRING DIAGRAM









INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM (REAR JUNCTION BLOCK ECU)

(a) Using the Techstream, read the Data List.

Body No. 4





Result





D -- CHECK HARNESS AND CONNECTOR (LICENSE PLATE LIGHT - REAR JUNCTION BLOCK ECU AND BODY GROUND)

C -- READ VALUE USING TECHSTREAM (CENTER STOP LIGHT)

B -- READ VALUE USING TECHSTREAM (STOP LIGHT)
A -- Continue to next step.

2. READ VALUE USING TECHSTREAM (TAILLIGHT AND LICENSE PLATE LIGHT)

(a) Disconnect the connectors in the following order: Rear combination light (LH, RH), rear light (LH, RH), license plate light.

(b) Using the Techstream, read the Data List.

Body No. 4





Result





D -- REPLACE LICENSE PLATE LIGHT Removal

C -- REPLACE REAR LIGHT ASSEMBLY Removal

B -- REPLACE REAR COMBINATION LIGHT ASSEMBLY Removal
A -- Continue to next step.

3. READ VALUE USING TECHSTREAM (REAR JUNCTION BLOCK ECU)

(a) Disconnect the connectors in the following order: S63, S64 rear junction block ECU connector.

(b) Using the Techstream, read the Data List.

Body No. 4





Result





B -- REPAIR OR REPLACE HARNESS OR CONNECTOR

A -- REPLACE LUGGAGE ROOM JUNCTION BLOCK (REAR JUNCTION BLOCK ECU)

4. READ VALUE USING TECHSTREAM (STOP LIGHT)

(a) Disconnect the connectors in the following order: Rear combination light (LH, RH), rear light (LH, RH).

(b) Using the Techstream, read the Data List.

Body No. 4





Result





HINT
Disconnect the RH connector, then the LH connector. If the display changes to "Normal", it can be determined that the disconnected light is malfunctioning.

C -- REPLACE REAR LIGHT ASSEMBLY Removal

B -- REPLACE REAR COMBINATION LIGHT ASSEMBLY Removal
A -- Continue to next step.

5. READ VALUE USING TECHSTREAM (REAR JUNCTION BLOCK ECU)

(a) Disconnect the connectors in the following order: S63, S64 rear junction block ECU connector.

(b) Using the Techstream, read the Data List.

Body No. 4





Result





B -- REPAIR OR REPLACE HARNESS OR CONNECTOR

A -- REPLACE LUGGAGE ROOM JUNCTION BLOCK (REAR JUNCTION BLOCK ECU)

6. READ VALUE USING TECHSTREAM (CENTER STOP LIGHT)

(a) Disconnect the connectors in the following order: Center stop light.

(b) Using the Techstream, read the Data List.

Body No. 4





Result





B -- REPLACE CENTER STOP LIGHT ASSEMBLY Removal
A -- Continue to next step.

7. READ VALUE USING TECHSTREAM (REAR JUNCTION BLOCK ECU)

(a) Disconnect the connectors in the following order: S62 rear junction block ECU connector.

(b) Using the Techstream, read the Data List.

Body No. 4





Result





B -- REPAIR OR REPLACE HARNESS OR CONNECTOR

A -- REPLACE LUGGAGE ROOM JUNCTION BLOCK (REAR JUNCTION BLOCK ECU)

8. CHECK HARNESS AND CONNECTOR (LICENSE PLATE LIGHT - REAR JUNCTION BLOCK ECU AND BODY GROUND)





(a) Disconnect the S63 ECU connector.

(b) Disconnect the S37 light connector.

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

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

9. CHECK HARNESS AND CONNECTOR (REAR LIGHT - REAR JUNCTION BLOCK ECU AND BODY GROUND)





(a) Disconnect the S63 ECU connector.

(b) Disconnect the S33 and S41 light connectors.

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

Standard resistance:

for LH
for RH










NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

10. CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT - REAR JUNCTION BLOCK ECU AND BODY GROUND)





(a) Disconnect the S64 ECU connector.

(b) Disconnect the S51 and S52 light connectors.

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

Standard resistance:

for LH
for RH










NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

11. CHECK HARNESS AND CONNECTOR (CENTER STOP LIGHT - REAR JUNCTION BLOCK ECU AND BODY GROUND)





(a) Disconnect the S62 ECU connector.

(b) Disconnect the S20 light connector.

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

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE LUGGAGE ROOM JUNCTION BLOCK (REAR JUNCTION BLOCK ECU)