DTC B28B8: Eyesight Steering Switch 1

WARNING: This page is about a different variant/trim than selected.

Detected when EyeSight steering switch is not installed or has malfunction, or when the harness is faulty or open-circuited or in stuck ON condition.

DTC detecting condition:

Wiring of the EyeSight steering switch is not connected.
EyeSight steering switch circuit is open.
EyeSight steering switch circuit stays ON.

Trouble symptom:

All functions of EyeSight system do not operate.

Wiring diagram:

EyeSight system Ref. to WIRING SYSTEM (CROSSTREK MODEL (HEV))>EYESIGHT SYSTEM>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

CAUTION: Before performing diagnosis, refer to "CAUTION" in "General Description". Ref. to EYESIGHT (DIAGNOSTICS) (HEV)>GENERAL DESCRIPTION>CAUTION .

CHECK DATA MONITOR .
1. Turn the ignition switch to ON.
2. Using the Subaru Select Monitor, check the following items in the [Data Monitor] of [EyeSight]. Ref. to EYESIGHT (DIAGNOSTICS) (HEV)>DATA MONITOR .
  - Cruise Control SW Voltage (Port14)
  - Cruise Control SW Voltage (Port16)
Is the voltage according to the pressed EyeSight steering switch displayed?

Yes : 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, temporary open or short circuit of harness may be the cause.

No : Go to 2.
CHECK HARNESS .
1. Turn the ignition switch to OFF.
2. Disconnect the stereo camera connector and EyeSight steering switch connector.
3. Using the tester, measure the resistance between stereo camera connector and EyeSight steering switch connector.
  Connector & terminal
  
  (ST3) No. 4 - (R137) No. 14:
  
  (ST3) No. 3 - (R137) No. 16:
  
  (ST3) No. 9 - (R137) No. 15:
Is the resistance less than 1 Ω?

Yes : Go to 3.

No : Repair or replace an open circuit in harness between the stereo camera connector and the EyeSight steering switch connector.
CHECK HARNESS .
Using the tester, measure the resistance between EyeSight steering switch connector and chassis ground.

Connector & terminal

(ST3) No. 4 - Chassis ground:

(ST3) No. 3 - Chassis ground:

(ST3) No. 9 - Chassis ground:

Is the resistance 1 MΩ or more?

Yes : Check the EyeSight steering switch. Ref. to EYESIGHT>SWITCHES AND HARNESS>INSPECTION .

No : Repair or replace the short circuit to ground in harness between the stereo camera connector and the EyeSight steering switch connector.