Author Topic: Mazda 3 2012 DSC light and locked rear brakes  (Read 3567 times)

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Offline amar1994

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Mazda 3 2012 DSC light and locked rear brakes
« on: September 24, 2017, 04:31:34 PM »
Please help,

After blower motor replacement my DSC light is on , brake pedal stiff and my rear brakes are almost seized , she can barely move . We plugged her into diagnostics tool and reset light , which immediately soften the brake pedal , but came on about minute later and the car is undrivable . No ABS and handbrake lights either , handbrake is completely lose  :(
« Last Edit: September 24, 2017, 04:33:27 PM by amar1994 »

Offline StevenRB45

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Re: Mazda 3 2012 DSC light and locked rear brakes
« Reply #1 on: September 24, 2017, 07:02:48 PM »
My immediate reaction to go back behind the dash and check for cut/nipped or disconnected wires before messing with anything else. It's too much of a coincidence for me to think it's unrelated.

Offline amar1994

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Re: Mazda 3 2012 DSC light and locked rear brakes
« Reply #2 on: September 24, 2017, 10:29:07 PM »
My immediate reaction to go back behind the dash and check for cut/nipped or disconnected wires before messing with anything else. It's too much of a coincidence for me to think it's unrelated.
thanks  :)

Offline StevenRB45

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Re: Mazda 3 2012 DSC light and locked rear brakes
« Reply #3 on: September 24, 2017, 11:32:53 PM »
The body control module lives directly behind where you plug your diagnostic computer. This controls the instrument panel and interior functions at the very least but can also be part of the abs system (not sure on the 3 to be honest.) But accidentally grounding something or not having part of a canbus system connected is usually a good way to make weird stuff happen.

It might have had a random brake component failure but that's pretty unlikely if it happened the moment after you had the dash to bits.

Offline amar1994

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Re: Mazda 3 2012 DSC light and locked rear brakes
« Reply #4 on: September 25, 2017, 12:07:00 AM »
The body control module lives directly behind where you plug your diagnostic computer. This controls the instrument panel and interior functions at the very least but can also be part of the abs system (not sure on the 3 to be honest.) But accidentally grounding something or not having part of a canbus system connected is usually a good way to make weird stuff happen.

It might have had a random brake component failure but that's pretty unlikely if it happened the moment after you had the dash to bits.
Yes , the car was perfectly fine before dash disassemble  :(

Thank you very much Steven , i will not let them touch my brake system until they check connections.

Offline moozmooz

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Re: Mazda 3 2012 DSC light and locked rear brakes
« Reply #5 on: September 25, 2017, 12:31:06 AM »
I had an assortment of electrical funnies after the pollen filter was changed on my 2005 3 many years ago. Same thing - big hands up the back of the dash not being careful enough what they were doing nor checking after they'd finished.
Do the brakes ease with the ignition off and did you hear the ABS pump hammering?

Offline amar1994

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Re: Mazda 3 2012 DSC light and locked rear brakes
« Reply #6 on: September 25, 2017, 11:08:10 PM »
Just to update for everyone in a future.

The BCM(body control module) lost it's memory and was sending impulse to the ABS which was locking the rear brakes, they had to relearn the module . So for now at least , no more dragging rear brakes .

Thanks everyone for help , sorry for my bad English  :D
« Last Edit: September 25, 2017, 11:11:31 PM by amar1994 »

Offline mart_haj1986

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Re: Mazda 3 2012 DSC light and locked rear brakes
« Reply #7 on: September 26, 2017, 09:26:47 AM »
How did you go about having the module reset, did you need to take it to the stealers?
Martin H - Nuneaton, Warwickshire UK

Offline amar1994

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Re: Mazda 3 2012 DSC light and locked rear brakes
« Reply #8 on: September 26, 2017, 10:59:10 AM »
How did you go about having the module reset, did you need to take it to the stealers?
The car was in a official Mazda dealer for the blower motor replacement . When they were putting everything back together , they had to test every single thing , so they reconnected battery like a 100 times , this caused BCM to lost it's memory  ;) .


Offline StevenRB45

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Re: Mazda 3 2012 DSC light and locked rear brakes
« Reply #9 on: September 26, 2017, 04:56:05 PM »
It might be worth going through all the functions, so wipers, lights, electric windows, central locking, mirrors, heated windows and mirrors, interior lights, ambient lighting e.t.c. e.t.c. as it will go via the BCM and making sure it is all working correctly and as intended. If it's back to factory settings no reason they wouldn't be but worth a check.

Offline amar1994

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Re: Mazda 3 2012 DSC light and locked rear brakes
« Reply #10 on: October 24, 2017, 10:10:56 PM »
It might be worth going through all the functions, so wipers, lights, electric windows, central locking, mirrors, heated windows and mirrors, interior lights, ambient lighting e.t.c. e.t.c. as it will go via the BCM and making sure it is all working correctly and as intended. If it's back to factory settings no reason they wouldn't be but worth a check.
:)
Thanks , everything works for now at least  :P

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Re: Mazda 3 2012 DSC light and locked rear brakes
« Reply #10 on: October 24, 2017, 10:10:56 PM »