Subaru IMPREZA GD 2007 Series Manual page 2695

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Step
1 CHECK OPERATION OF BRAKE LIGHT.
Depress the brake pedal.
2 CHECK INPUT SIGNAL FROM TCM.
1) Disconnect the harness connector of TCM.
2) Measure the voltage of the harness
between TCM and stop light switch.
Connector & terminal
(B55) No. 20 (+) — Chassis ground (–):
3 CHECK STOP LIGHT SWITCH.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from stop light
switch.
3) Measure the resistance of harness between
stop light switch connectors.
Connector & terminal
No. 2 — No. 3:
4 CHECK HARNESS CONNECTOR BETWEEN
TCM AND STOP LIGHT SWITCH.
1) Turn the ignition switch to ON.
2) Measure the voltage of harness between
TCM and chassis ground.
Connector & terminal
(B55) No. 20 (+) — Chassis ground (–):
Check
Brake light illuminates.
Is the voltage 10 V or more?
Is the resistance 1 MΩ or
more?
Is the voltage less than 1 V?
4AT(D)(diag)-56
Yes No
Go to step 2. Check the brake
light circuit.
Go to step 3. Repair the poor
contact.
Go to step 4. Replace the stop
light switch.
Repair the poor Repair the short
contact. circuit of harness
between TCM and
stop light switch.