DTC P0724: Brake Switch "B" Circuit High: Notes

DTC detecting condition: 

Immediately at fault recognition

Trouble symptom: 

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

Wiring diagram: 

Stop light system Refer to WIRING SYSTEM>STOP LIGHT SYSTEM .

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK STOP LIGHT SWITCH. 
   1. Turn the ignition switch to OFF.
   2. Disconnect the stop light switch connector.
   3. Measure the resistance between stop light switch.

      Terminals 

      No. 1 - No. 2:

   Is the resistance 1 MΩ or more?

   Yes:  Go to  2.

   No:  Replace the stop light switch. Refer to BRAKE>STOP LIGHT SWITCH .

2. CHECK HARNESS. 
   1. Disconnect the TCM connector.
   2. Turn the ignition switch to ON.
   3. Measure the voltage between TCM connector and chassis ground.

      Connector & terminal 

      (B54) No. 29 (+) - Chassis ground (-):

   Is the voltage 10 V or more?

   Yes:  Repair the short circuit of harness.

   No:  Go to  3.

3. CHECK INPUT SIGNAL FOR TCM. 
   1. Connect all connectors.
   2. Turn the ignition switch to ON.
   3. Read the data of «Stop Light Switch» using Subaru Select Monitor.

   Is "OFF" displayed?

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

   No:  Go to  4.

4. CHECK FOR POOR CONTACT. 

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

   Yes:  Repair the poor contact.

   No:  Replace the TCM. Refer to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>TRANSMISSION CONTROL MODULE (TCM) .