Diagnostic Aids

If the A/T shift lock control circuit is shorted to battery positive voltage, the automatic transmission shift lock control solenoid will be unlocked. The vehicle will shift out of PARK without depressing the brake pedal.
Perform the tests while wiggling the wires and connectors. This may often cause an intermittent malfunction to appear. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.