A5 -- Check Signal to Actuator

^ Key OFF.

^ Disconnect the shift lock actuator connector.

^ Depress the brake pedal.

^ Measure the voltage of the GN wire at the shift lock actuator connector.

^ Is the voltage greater than 10 volts?

YES -- Go to A7. A7 -- Check Actuator Ground

NO -- Go to A6. A6 -- Check Stoplamp Operation