Subaru Crosstrek Service Manual: Dtc p0719 brake switch "b" circuit low

DTC detecting condition:

Immediately at fault recognition

Trouble symptom:

Gear is not shifted down when climbing a hill or driving down a hill.

CAUTION:

Use the check board when measuring the TCM terminal voltage and resistance.

• Without EyeSight

Stop light system Stop Light System > WIRING DIAGRAM">

1.CHECK FUSE (NO. 8).

1) Turn the ignition switch to OFF.

2) Remove the fuse (No. 8).

3) Check the fuse.

Is the check result OK?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0719 BRAKE SWITCH "B" CIRCUIT LOW">Go to Step 2.

Replace the fuse (No. 8). If the new fuse (No. 8) has blown out easily, repair the short circuit of harness between fuse (No. 8) and stop light switch.

2.CHECK HARNESS.

1) Turn the ignition switch to OFF.

2) Disconnect the TCM connector.

3) Disconnect the stop light switch connector.

4) Measure the resistance between TCM connector and stop light switch connector.

Connector & terminal

(B54) No. 29 — (B65) No. 4:

Is the resistance less than 1 ??

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0719 BRAKE SWITCH "B" CIRCUIT LOW">Go to Step 3.

Repair the open circuit of harness.

3.CHECK HARNESS.

Measure the resistance between the stop light switch connector and fuse (No. 8).

Connector & terminal

(B65) No. 3 — fuse (No. 8):

Is the resistance less than 1 ??

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0719 BRAKE SWITCH "B" CIRCUIT LOW">Go to Step 4.

Repair the open circuit of harness.

4.CHECK INPUT SIGNAL FOR TCM.

1) Install the fuse (No. 8).

2) Connect the stop light switch connector.

3) Depress the brake pedal.

4) Measure the voltage between TCM connector and chassis ground.

Connector & terminal

(B54) No. 29 (+) — Chassis ground (−):

Is the voltage 10 V or more?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0719 BRAKE SWITCH "B" CIRCUIT LOW">Go to Step 5.

Replace the stop light switch. Stop Light Switch">

5.CHECK INPUT SIGNAL FOR TCM.

1) Connect the TCM connector.

2) With brake pedal depressed, read the data of «Stop Light Switch» using Subaru Select Monitor.

Is “ON” displayed?

Current condition is normal. Check for poor contact in connectors or harnesses, and repair the defective part.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0719 BRAKE SWITCH "B" CIRCUIT LOW">Go to Step 6.

6.CHECK FOR POOR CONTACT.

Is there poor contact in the stop light switch input signal circuit?

Repair the poor contact.

Replace the TCM. Transmission Control Module (TCM)">

• Detect no input from the brake signal.

• Judge as NG if a predetermined number of deceleration occurs while the cruise control is set to OFF and the brake is OFF.

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