B2284

DESCRIPTION

This DTC is output when: 1) the brake signal circuit between the power source control ECU and the stop light switch is malfunctioning; and 2) the BEAN information is inconsistent.

HINT:

When the power source control ECU is replaced with a new one and the negative (-) battery terminal is connected, the power source mode becomes the IG-ON mode. When the battery is removed and reinstalled, the power source mode that was selected when the battery was removed is restored.

DTC No.	DTC Detection Condition	Trouble Area
B2284	Communication or communication line is abnormal between the power source control ECU and the stop light switch	Stop light switch Multiplex communication system CAN communication system ECM Power source control ECU Wire harness or connector

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:

Before performing the inspection, depress the brake pedal and check that the stop lights come on. If the stop lights do not come on when the brake pedal is depressed, refer to the page shown in the brackets (Click here).

1. CHECK DTC OUTPUT (MULTIPLEX NETWORK COMMUNICATION SYSTEM)

1. Delete the DTC (Click here).

2. Check for the multiplex network communication system DTCs B1210, B1214 and B1215.

   HINT:

   If the DTCs for the multiplex network communication system malfunction are output, inspect those DTCs first (Click here).

   OK:

   No DTC is output.
   

NG	GO TO MULTIPLEX COMMUNICATION SYSTEM

OK

2. CHECK DTC OUTPUT (CAN COMMUNICATION SYSTEM)

1. Delete the DTC (Click here).

2. Check for the CAN communication system DTC U0146.

   HINT:

   If the DTCs for the CAN communication system malfunction are output, inspect those DTCs first (LHD: Click here, RHD: Click here).

   OK:

   No DTC is output.
   

NG	GO TO CAN COMMUNICATION SYSTEM

OK

3. INSPECT FUSE (STOP SW)

1. Remove the STOP SW fuse from the cowl side J/B RH.

2. Measure the resistance of the fuse.

   Standard resistance:

   Below 1 Ω
   

NG	REPLACE FUSE

OK

4. CHECK CONNECTORS

1. Check that the connectors are securely connected and the terminals are not deformed or loose.

   OK:

   The connectors are securely connected and the terminals are not deformed or loose.
   

NG	REPAIR OR REPLACE CONNECTORS

OK

5. CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - BODY GROUND)

1. Disconnect the ECU connector.

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

   Standard resistance:

   Tester Connection (Symbols)	Condition	Specified Condition
   J55-6 (GND2) - Body ground	Always	Below 1 Ω

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

6. CHECK WIRE HARNESS (BATTERY - POWER SOURCE CONTROL ECU)

1. Measure the volage according to the value(s) in the table below.

Standard voltage:

Tester Connection (Symbols)	Condition	Specified Condition
J55-1 (STP) - Body ground	Brake pedal released	Below 1 V
J55-1 (STP) - Body ground	Brake pedal depressed	10 to 14 V

OK	Go to step 8

NG

7. INSPECT STOP LIGHT SWITCH

1. Remove the switch.

2. Measure the resistance of the switch.

   Standard resistance:

   Tester Connection	Condition	Specified Condition
   1 - 2	Switch pin free	Below 1 Ω
   3 - 4	Switch pin free	10 kΩ or higher
   1 - 2	Switch pin pushed in	10 kΩ or higher
   3 - 4	Switch pin pushed in	Below 1 Ω

NG	REPLACE STOP LIGHT SWITCH

OK
REPAIR OR REPLACE HARNESS OR CONNECTOR

8. READ VALUE OF INTELLIGENT TESTER (STOP LIGHT SWITCH)

1. Reconnect the connectors.

2. Check the DATA LIST for proper functioning of the stop light switch.

   Power source control ECU: 

   Item	Measurement Item/Display (Range)	Normal Condition	Diagnostic Note
   Stop Lamp SW1	Stop light switch 1/ ON or OFF	ON: Brake pedal depressed OFF: Brake pedal released	-

   OK:

   ON (brake pedal depressed) and OFF (brake pedal released) appear on the screen.
   

NG	REPLACE POWER SOURCE CONTROL ECU

OK
REPLACE ECM