GM Service Manual Online
For 1990-2009 cars only

Checks

Action

Check to see that the ignition switch is set correctly.

Reset the ignition switch.

Check the lock cylinder for damage.

Replace the lock cylinder.

Check the fust F 17 from the I/P fuse block.

Replace the fuse F 17.

Check for an open or short circuit between terminal 2 of the key interlock solenoid and the I/P fuse block.

Replace the fuse F 17.

Select the gear shift lever to "P" position. Check the resistance between the terminal 2 and 1 of the "P" position switch.

Replace the "P" position switch.

Check for an open or short circuit between the ground G 202 and terminal 1 of the key interlock unit.

Replace the open or short from the circuit.

Turn the ignition ON. Select the gear shift lever to "P" position. Check the resistance between the terminal 1 and 2 of the key interlock solenoid.

Replace the key interlock solenoid.