Pressure Switch Manifold (PSM) Logic

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Range	Pressure Switch 1 - N/O		Pressure Switch 2 - N/O		Pressure Switch 3 - N/O		Pressure Switch 4 - N/C
Range	Switch Status	Scan Tool Status	Switch Status	Scan Tool Status	Switch Status	Scan Tool Status	Switch Status	Scan Tool Status
R	Open	HIGH*	Closed	LOW	Closed	LOW	Closed	LOW
N	Closed	LOW	Closed	LOW	Closed	LOW	Open	HIGH
1	Open	HIGH	Closed	LOW	Open	HIGH	Open	HIGH
2	Open	HIGH	Open	HIGH	Open	HIGH	Open	HIGH
3	Closed	LOW	Open	HIGH	Open	HIGH	Open	HIGH
4	Closed	LOW	Open	HIGH	Closed	LOW	Open	HIGH
5	Open	HIGH	Open	HIGH	Closed	LOW	Open	HIGH
6	Open	HIGH	Open	HIGH	Closed	LOW	Open	HIGH
N/C = Normally Closed N/O = Normally Open * Pressure switch 1 (PS1) reverts to the Closed/LOW state with throttle applied in REVERSE.