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Suburban LTZ Power Running Boards

7 messages,  Last post on Nov 24, 2009 at 7:17 AM

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#1 of 7 2007 Suburban LTZ Power Running Boards by joeykb Oct 10, 2009 (1:29 pm)
I recently had my battery replaced. After it was replaced, the power running boards do not work any more. I have tried switching them on and off. When the battery was replaced, the power running board switch was in the off position. Replies to this message: kiawah (Oct 10, 2009 3:22 pm) joeykb (Oct 10, 2009 4:59 pm) kiawah (Oct 10, 2009 5:29 pm) and 3 more...
#2 of 7 Re: 2007 Suburban LTZ Power Running Boards [joeykb] by kiawah Oct 10, 2009 (3:22 pm)
Replying to: joeykb (Oct 10, 2009 1:29 pm) Did you check the fuse? Replies to this message: joeykb (Oct 10, 2009 4:59 pm) kiawah (Oct 10, 2009 5:29 pm) joeykb (Oct 11, 2009 7:41 am) and 2 more...
#3 of 7 Re: 2007 Suburban LTZ Power Running Boards [kiawah] by joeykb Oct 10, 2009 (4:59 pm)
Replying to: kiawah (Oct 10, 2009 3:22 pm) Yes, Sorry I did forget to mention that I replaced the 30A fuse. Replies to this message: kiawah (Oct 10, 2009 5:29 pm) joeykb (Oct 11, 2009 7:41 am) kiawah (Oct 11, 2009 8:02 am) and 1 more...
#4 of 7 Re: 2007 Suburban LTZ Power Running Boards [joeykb] by kiawah Oct 10, 2009 (5:29 pm)
Replying to: joeykb (Oct 10, 2009 4:59 pm) Make sure the ASC (assist step control) disable switch is not pressed.   The ASC has an error condition fault detector, and if it detects an error, it will disable the ASC until it has had 50 error free ignition cycles. I'd go try that first, before going much further. I'm wondering if changing the battery created an error fault for you.   If that doesn't resolve the problem, check under the vehicle, under the running boards. One side will have just a motor. The drivers side would have a motor and the assist step control module.   It'll have two plugs, one plug is a 6 prong plug, the other a 10 prong plug.   On the 6 prong plug, two rows of 3 pins. The pin #5 (a middle pin in one of the rows and a RD/BK wire), is the battery voltage. See if you have 13 volts there. If you don't, then you have a power feed problem to the control module. If you do, then you can choose to either take it to the dealer to see if they have a tool to run diagostics on the controller, replace the controller on the possibility that it has blown somehow, or live without the power steps.   Good luck, let me know how it goes.   I didn't get steps with mine, more to go wrong Replies to this message: joeykb (Oct 11, 2009 7:41 am) kiawah (Oct 11, 2009 8:02 am) jboudreau (Nov 24, 2009 7:17 am)
#5 of 7 Re: 2007 Suburban LTZ Power Running Boards [kiawah] by joeykb Oct 11, 2009 (7:41 am)
Replying to: kiawah (Oct 10, 2009 5:29 pm) Ok, I cycled the ignition 50 times, by that I mean, I started and stopped the engine 50 times, removing the key between every cycle. I also checked the voltage on the #5 pin and it did in-fact have about 13 volts. I guess I will need to bring this to a dealer to get fixed. Thanks for your input. Replies to this message: kiawah (Oct 11, 2009 8:02 am) jboudreau (Nov 24, 2009 7:17 am)
#6 of 7 Re: 2007 Suburban LTZ Power Running Boards [joeykb] by kiawah Oct 11, 2009 (8:02 am)
Replying to: joeykb (Oct 11, 2009 7:41 am) Rats....that is unfortunate. Might want to do a price check on the price of a ASC controller, to know that prior to going to the dealership.....just so you aren't surprised if that is what they recommend. Replies to this message: jboudreau (Nov 24, 2009 7:17 am)
#7 of 7 Re: 2007 Suburban LTZ Power Running Boards [kiawah] by jboudreau Nov 24, 2009 (7:17 am)
Replying to: kiawah (Oct 11, 2009 8:02 am) Well, after a few weeks of searching, I found the answer to the problem. After the battery has been replaced, the ASC controller goes into storage mode. To get them out of that mode, simply open all 4 doors and press the ASC controller disable button on and off 4 times. The running boards open and function properly. Thanks for everyone's reply.

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