Code P1567, Cruise Switches Circuit: Notes

WARNING: This page is about a different car, the 1994 Oldsmobile Ninety-Eight and 1994 Buick Park Avenue. However, it is still accessible from the selected car via links, so may be relevant.

Power is supplied to cruise control switches and cruise brake switch as well as other circuits by the ignition switch. Circuit is protected by a 15-amp fuse. Code P1567 will set when the following conditions are present.

ON/OFF switch is open between cruise engage switch and PCM.
SET/COAST switch is indicated closed for more than 7 1/2 minutes (switch problem).
RESUME/ACCEL switch is indicated closed for more than 7 1/2 minutes (switch problem).
Cruise brake signal is open to PCM (no change in status of cruise brake switch) when vehicle makes 5 stops from 35 MPH (for more than 10 seconds) down to zero MPH.
Any of above circuits are shorted to voltage.
One of above conditions are met.

When Code P1567 is set, PCM will not allow cruise control operation. P1567 does not illuminate the Malfunction Indicator Light (MIL).

NOTE: A short to ground in cruise ON/OFF circuit, SET/COAST, cruise/brake or RESUME/ACCELL will cause a failure of cruise engagement switch. It will not blow the 15-amp fuse.