DTC B2284 Brake Signal Correlation

DTC DETECTING CONDITION:

When the brake signal transmitted via solid line and the brake signal transmitted via CAN communication line do not match.

TROUBLE SYMPTOM:

CAUTION: For replacement procedure of Keyless Access Control Module, refer to the "REGISTRATION MANUAL FOR IMMOBILIZER" provided as a separate volume.

WIRING DIAGRAM:

Stop light system <Ref. to WIRING DIAGRAM , Stop Light System.>

Fig 1: Brake Signal Correlation - Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

Step	Check	Yes	No
1 CHECK LAN SYSTEM. Inspect LAN system. <Ref. to PROCEDURE , Basic Diagnostic Procedure.>	Is the check result OK?	Go to step 2 .	Perform the inspection according to the diagnosis for LAN system.
2 CHECK CURRENT DATA. Check the current data display of «Keyless Access with Push Button Start» using Subaru Select Monitor. <Ref. to READ CURRENT DATA .> «Stop light SW»	Is DTC displayed normally according to the brake pedal operation?	Go to step 3 .	Check the stop light system.
3 CHECK CURRENT DATA. Confirm the current data display of «Body Control» using Subaru Select Monitor. <Ref. to READ CURRENT DATA .> «Stop light SW»	Is DTC displayed normally according to the brake pedal operation?	Go to step 4 .	Check body integrated unit <Ref. to BASIC DIAGNOSTIC PROCEDURE , Basic Diagnostic Procedure.> and the stop light switch circuit.
4 CHECK FUSE. Check the fuse. <Ref. to Relay and Fuse .>	Is the check result OK?	Go to step 5 .	Replace the fuse. When the replaced fuse is blown immediately, check the power supply circuit for short-circuited.
5 CHECK HARNESS. Disconnect the Keyless Access Control Module connector. Using a tester, measure the voltage between the Keyless Access Control Module connector and chassis ground. Connector & terminal (B572) No. 2 (+) - Chassis ground (-):	Is the voltage 9.5 - 16 V?	Go to step 6 .	Check the power supply circuit.
6 CHECK HARNESS (OPEN CIRCUIT). Using a tester, measure the resistance between the Keyless Access Control Module connector and chassis ground. Connector & terminal (B572) No. 11 - Chassis ground:	Is the resistance less than 1 Ω?	Go to step 7 .	Repair or replace the open circuit of harness.
7 CHECK HARNESS (OPEN CIRCUIT). Disconnect the stop light switch connector. Using a tester, measure the resistance between the Keyless Access Control Module connector and stop light switch connector. Connector & terminal (B572) No. 18 - (B65) No. 2:	Is the resistance less than 1 Ω?	Go to step 8 .	Repair or replace the open circuit of harness.
8 CHECK HARNESS (GROUND SHORT CIRCUIT). Using a tester, measure the resistance between the Keyless Access Control Module connector and chassis ground. Connector & terminal (B572) No. 18 - Chassis ground:	Is the resistance 10 kΩ or more?	Go to step 9 .	Repair or replace the short circuit of the harness.
9 CHECK HARNESS. Using a tester, measure the voltage between the Keyless Access Control Module connector and chassis ground when the brake pedal is depressed. Connector & terminal (B572) No. 18 (+) - Chassis ground (-):	Does the voltage change as follows? 1 V or less (brake pedal not depressed) → 11 - 14 V (brake pedal depressed)	Replace the Keyless Access Control Module. <Ref. to REMOVAL , Keyless Access Control Module.>	Check the power supply circuit of stop light switch.