No Turn Signals... Bad BCM?
 

Hey everyone! Been driving my Monte for a year now since I fixed my other no start issue. However, Recently I've been experiencing something very weird... When driving the battery and E-Brake light come on simultaneously and all the gauges do a sweep ( takes about 2 secs) then disappear... after this happens my turn signals no longer work. The battery and brake light come on multiple times during a short drive but after they do it the first time the blinkers don't work. As of yesterday, the blinkers dont work even before these two lights come on (even in acc). The Hazards DO work though... strange... In addition, the car freaked out two weeks ago and wouldn't start. it killed all accessories when turning the key. After 30 mins it started right up (pass lock issue??) Seems strange considering all fuses look good, just switched out the turn signal switch and ignition lock cylinder. Any and All help is greatly appreciated!!!

That is pretty strange.... I'm wondering if a bad ground could be contributing to the problem. Is there any specific situation which it occurs (ie accelerating, braking, changing gears)?

Yeah could be... It happens when i put my foot on the brake most of the time. Additionally, when this happens the car chimes three times as if I'd just put my keys in the ignition. Is it possible that maybe the BCM is turning on and off when signal is sent to it (Via the brakes)? Also, do you know where the ground is for the BCM? Thanks.

Here is a list of ground cables on the car. I'll have to check the diagrams but I think it is 201, 202, or 203 you should look for.


G100
Battery cable, negative cable, RH side of engine compartment to the RH frame rail
G101
Left side of the radiator support
G111
Top right of the engine, below the ignition control module
G113
Lower LF of the engine, on the automatic transaxle stud, near the starter
G151
On the left frame rail, forward of the left front strut tower
G171
On the left frame rail, right of the left front strut tower, rear of G151
G201
Behind the I/P, on the LH side of the brake pedal bracket
G202
Behind the I/P, in the center
G203
Behind the I/P in the RH side of the brake pedal bracket
G301
At the base of the LH B-pillar
G302
At the base of the RH B-pillar
G309
On the RH side B-pillar

Okay Thanks! Checking tomorrow morning. Will keep you updated!

Did you happen to get that sorted?

after looking for an hour, I couldn't find any of the grounds that you'd mentioned. Are they inside the car or outside? Also, is it possible that this issue could be caused by the wiring harness that goes from the bcm to the pcm?

they should be "inside" and yeah that could be possible. honestly stuff like this can be hard to track unless you sit there with a multimeter checking every connection. I'm hoping someone else might have some input too on this situation.

How old is the battery?
Should have it tested to make sure she has at least a 14.1 or better charge. Even new batteries go bad. BCM unlikely but maybe, usually more stuff shows up with that.
Then check the battery ground either at the connection or the body then you night check the alternator as well and its grounds. Check out theses links
https://www.google.com/search?q=Turn...w=1600&bih=786

https://cimg2.ibsrv.net/gimg/monteca...47355e3535.gif
https://cimg5.ibsrv.net/gimg/monteca...6dcaa98c45.gif
Here are a few ground locations to check.
and you're right it seems as though the previous info from the other grounds is either wrong or mislabeled. Sorry about that :/