Description & Operation: Notes

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2000 GMC Yukon, 2000 GMC Pickup, 2000 GMC Cab & Chassis, 2000 GMC C3500 HD, and 2000 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.

WARNING: Vehicles are equipped with air bag supplemental restraint system. Before attempting ANY repairs involving steering column, instrument panel or related components, see SERVICE PRECAUTIONS and DISABLING & ACTIVATING AIR BAG SYSTEM in appropriate AIR BAG RESTRAINT SYSTEMS article.

NOTE: This article applies to "old style" "C" & "K" Series vehicles equipped with 5.7L, 6.5L and 7.4L engines. For "new style" "C" & "K" Series vehicles, see POWER DOOR LOCKS -- SIERRA, SILVERADO, SUBURBAN, TAHOE, YUKON & YUKON XL article.

NOTE: On some vehicles, the power door lock system is integrated with the Remote Keyless Entry (RKE) system. For information on RKE, see appropriate REMOTE KEYLESS ENTRY SYSTEMS article.

When door lock switch is operated, all doors will lock or unlock. Each lock can also be operated manually. Locks are operated by reversible motors. Door lock switches operate to turn motors on by supplying battery voltage to one terminal and ground to the other terminal.

When either door lock switch is moved to LOCK position, switch completes a circuit to the motors. Motor in each door runs to operate door locks. When door lock switch is released, circuit is opened and motors turn off. When door lock switch is moved to UNLOCK position, polarity of voltage to motors is reversed.

Door lock switches are usually closed for just a moment. If door lock switches are held closed for an extended time, a circuit breaker in each motor will open to protect motor against damage. Circuit breakers close automatically when they cool down.