Will you please help me?

Tiny
SWEETESTCAVALIAR
  • MEMBER
  • 2001 SATURN SC2
  • 62 MILES
Working on a 2001 saturn sc2. There is a computer underneath the dash, , presuming it's the BCM? The car runs. My problem is that a clicking noise comes from this box, whenever it feels like, no key required. The battery is in good condition, like I said, the car starts. Any ideas as far as troubleshooting or resolving this problem? If it helps, on this box, from what I see, there are three connectors. If I disconnect the middle one, the clicking will go away, but the car will not run with it disconnected. What is all controlled by that connector?
Tuesday, August 21st, 2012 AT 7:40 AM

13 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Is this the one you are refering to? If yes, it is the BCM. Start by checking for trouble codes.
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Tuesday, August 21st, 2012 AT 7:51 AM
Tiny
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That would be the one. Just to verify, checking the codes for this computer, would I still use same scanner, and hook up below steering wheel, like always?
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Tuesday, August 21st, 2012 AT 7:55 AM
Tiny
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Sry, never had to test this one before.
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Tuesday, August 21st, 2012 AT 8:02 AM
Tiny
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And actually, I'm pretty sure my scanner won't read those codes. Is there another way? What do those specific wires feed to?
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Tuesday, August 21st, 2012 AT 8:15 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Normal code readers would not show BCM codes. These are B codes.
What you need is a proper scan tool with the capabilities and there is no other way to go about.

The wires control a host of things that are somewhat interlinked in functions.

Schematic shows what each connector is for. It should be J2 connector you are refering to.
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Tuesday, August 21st, 2012 AT 8:27 AM
Tiny
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That helps out a little, at least narrow some things down. What would actually make that clicking noise? It almost sounds like a turn signal, but faster, which the signals are not on. Id there any more wiring charts you can send over? I'm interested where it says computer data lines.
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Tuesday, August 21st, 2012 AT 9:01 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Clicking noises are usually from relays and it could be a bad connections (sometimes bad soldered joints of circuit boards), a failing relay which is incorporated into the BCM or even a poor ground. Computer datalines refers to the lines that goes to the computer and such lines usually cannot be tested by conventional means.
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Tuesday, August 21st, 2012 AT 10:11 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
What I mean about not being able to test is the voltages or output. Of course you can test the continuity.
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Tuesday, August 21st, 2012 AT 10:12 AM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Just to add to this one what color is the connector you unplugged and the noise stopped?Was it blue?If so that the J2 connector and I will get you a pin out of it. Sounds like a bad bcm though.
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Tuesday, August 21st, 2012 AT 4:23 PM
Tiny
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It is the blue connector. Just to add, the wires in the both doors have been cut, along with the wires for the fuel & trunk doors. Would this make an impact on the situation?
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Tuesday, August 21st, 2012 AT 10:29 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
The doors for sure they feed power door locks. Why are the wires cut?I. Would repair them and go from there.
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Tuesday, August 21st, 2012 AT 10:36 PM
Tiny
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I'll do that and then I'll let you know, might be couple days before I can get that done.
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Tuesday, August 21st, 2012 AT 10:48 PM
Tiny
SATURNTECH9
  • MECHANIC
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Fix all the wires and keep me posted.
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Tuesday, August 21st, 2012 AT 11:00 PM

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