EyeSight (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC B28B6 PRE-COLLISION OFF SWITCH
Detected when pre-collision brake OFF switch circuit is not installed, open-circuited or is stuck to ON.
DTC detecting condition:
• Wiring of pre-collision brake OFF switch is not connected.
• Pre-collision brake OFF switch circuit is open.
• Pre-collision brake OFF switch circuit stays ON for 45 seconds or more.
Trouble symptom:
All functions of EyeSight system do not operate.
Wiring diagram:
EyeSight System EyeSight System > WIRING DIAGRAM">
STEP | CHECK | YES | NO |
1.CHECK CURRENT DATA.
Confirm the current data «Pre-Collision Brake OFF SW Status (BIU)» of EyeSight using Subaru Select Monitor. Read Current Data">
Does the display change according to ON/OFF operation of the pre-collision brake OFF switch?
Even if DTC is displayed, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.
NOTE:
In this case, temporary poor contact of connector, or temporary open or short circuit of harness may be the cause.
Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B28B6 PRE-COLLISION OFF SWITCH">Go to Step 2.
2.CHECK HARNESS.
1) Disconnect the stereo camera connector and the pre-collision brake OFF switch connector.
2) Using the tester, measure the resistance between the stereo camera connector and pre-collision brake OFF switch connector as well as chassis ground.
Connector & terminal
(R406) No. 3 — (R137) No. 12:
(R406) No. 5 — Chassis ground:
Is the resistance less than 1 ??
Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B28B6 PRE-COLLISION OFF SWITCH">Go to Step 3.
Repair or replace an open circuit in harness between the stereo camera connector and pre-collision brake OFF switch connector.
3.CHECK HARNESS.
Using the tester, measure the resistance between the pre-collision brake OFF switch connector and chassis ground.
Connector & terminal
(R406) No. 3 — Chassis ground:
Is the resistance 1 M? or more?
Check the pre-collision brake OFF switch. Switches and Harness > INSPECTION">
Repair or replace the short circuit to ground in harness between the stereo camera connector and pre-collision brake OFF switch connector.
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