Parking Position Switch indicates that Shift Lever is in P range or not.
SMK Unit decides that engine starting is enable after receiving Parking Position Switch signal.
SMK unit sets DTC B1971 if vehicle speed is over 3km/h while parking switch signal is ON.
Item
Detecting Condition
Possible Cause
DTC Strategy
Parking switch is On
Vehicle speed from CLU is above 3km/h IGN ON
Ignition switch is On
Poor Connection in harness
Faulty Parking Switch
Faulty Smartkey Unit
Enable Conditions
Button start system equipped
Ignition ON
Parking switch ON
Vehicle Speed above 3km/h
Threshold value
Parking switch is ON when signal voltage is below 2V
Parking switch is OFF when signal voltage is above 7V
Failsafe
Parking switch is On for 10 seconds with Ignition On & Vehicle speed above 3km/h
DTC Erasing Time
Ignition OFF
Parking switch is OFF
Vehicle speed is below 3km/h
DTC erasing immediately with above 3 conditions meet