What Is This, What Does It Do
Okay, hopefully this question of mine can be answered. The vehicle is my business van. I have been having trouble with the door lock on driver side not unlocking with remote. I had some free time yesterday to look into it some. My only question is what the heck is a indexing motor. What turns it? Both sides of motor are grounded, that would keep the motor from turning! I have searched service information and found no mention of this motor. In fact I found very poor information about the whole system.
I'm pretty sure I need a new door latch. When locked I can move the lock lever above the door release pull on inside of door slightly to the unlock position and can get door lock to operate when pressing unlock on key. Pretty sure that its gonna need a latch. I'm just really puzzled on what the index motor does!
I've included 2 segments of the wire diagram. Index motor is circled in red!
I am not sure what indexing motor is but definitely make sure the push button on the door inside is not binding. I have seen how a new latch locks but does not unlock because of too much friction/ slight misalignment of the button with the hole in the door trim. Usually a squirt of silicone fixes the problem.
Wires to Actuator-getting a signal? boot Around actuator broken? disconnect actuator and re test wires in door or at switch or broken boot
Is an indexing motor another name for a stepper motor? Lots of resources on youtube if it is-
No it should not be. That motor is a 2 wire. Both input and output are grounded. That motor should never be able to be turned unless it has lots of force applied
With both sides grounded, or hot it will turn like there was no electrical load. My RC servos have two wires to the motors and turn freely without power. When powered they resist movement either direction unless commanded. Without testing that motor in real time you don't know what it does. It is simply a part of a larger component. Is it really a motor? Or some type of stepper or counter to…
It would be helpful if you could post the whole wiring diagram for the motor.
Jeff in the diagram from On Demand there's a dotted line from the switch leg with the diode to the middle right of the motor, it's possible that the BCM uses brush counting or a hall effect to determine motor position. I can't get a picture to post properly.
From what little bit I know about them they work like a blend door actuator I have repaired two of them one of them I replaced also they are not cheap depending where it is purchased from $200 - $300. The second one I took it apart just to see what made it tick it has gears petitioner contacts and electric motor I got online ( eBay ) and bought a motor for $6 and one of my gears was cracked need…
I have been having trouble with the door lock on driver side not unlocking with remote. Does it work properly with the unlock button on the door ?
Have you seen what it may be attached to? Is it possible it's the motor that activates the latch or reports latch position?
Jeffrey- This is a redrawn version and a description of the “stepper lock” ability. I think maybe that is what it is for. “The stepped unlock feature is controlled by the GEMand allows a stepped unlock process when enabled, or a single stage unlock process when disabled. If the stepped unlock is enabled, both front and sliding doors unlock on the unlock command (the sliding doors will not…
I think I may have decoded the mystery. It appears the ‘index motor’ is tied to the movement of the exterior lock cylinder and the interior lock lever. It signals the GEM to perform a lock or unlock function depending on movement from it's previous position. Basically it's a two position switch. My guess is that represented as a motor since it's likely on a common shaft with the lock motor so it…
Well I’m still not 100% sure on what it does. When I get around to replacing it I’ll tear into the old one!
Jeffrey, You never answered my question about if it works with the door buttons ? The reason I asked is I had the same problem with my Tahoe and is turned out to be the receiver for the remotes. Locks worked fine with the button but not with the remote.