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2010 Cadillac CTS - Battery Reset

  • robert.lesaca
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26 Nov 2019 17:33 #35361 by robert.lesaca
2010 Cadillac CTS - Battery Reset was created by robert.lesaca
Though my scanner has a battery reset, unfortunatelys it does not support one for Cadillac or any GM model. Is there another way of resetting battery after a replacement was done? The cars starting fine exept the headlamps and signal lights dont work after battery replacemen; there are no other issues nor DTC...thank you.

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29 Nov 2019 18:01 #35425 by robert.lesaca
Replied by robert.lesaca on topic 2010 Cadillac CTS - Battery Reset
Ok...I decided to check the BCM module; connected the CAN Hi and Lo to my laptop and this is the waveform with BCM X3 connector pluggedin :

File Attachment:

File Name: CANHiandLo...din1.pdf
File Size:470 KB

File Attachment:

File Name: CANHiandLo...din1.pdf
File Size:470 KB


And this the wavform with the connector X3 unplugged :

File Attachment:

File Name: CANHiandLo...ged2.pdf
File Size:470 KB


Like wise the terminating resistor read 62 ohms with X3 connector unplug and 122.7 plugged in.

I am not versed in CAN Bus. But does the waveform indicate short to ground in the CAN Lo? I checked power to all connectors and all read battery voltage. It was only the ground wire in connextor X3 that read 29.6 mv KOEO and 31.4 mv KOER. In the absence of a wiring diagram, I cannot trace wires thats connected to connector X3.

I hope someone out there can share his thoughts or expertise. I want to make sure if its a component or module that is defective. Thanks
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29 Nov 2019 18:42 #35426 by Cheryl
Replied by Cheryl on topic 2010 Cadillac CTS - Battery Reset
In reality they both look wrong. You are supposed to see 2.5 yo 3.5 volts on can h and 2.5 to 1.5 can l. You sure you have a good scope ground?? If they looked like that then I’d suspect a no communication with the bus.

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29 Nov 2019 18:47 #35427 by robert.lesaca
Replied by robert.lesaca on topic 2010 Cadillac CTS - Battery Reset
totally agree...yes ground is good, connected in BOB chassis ground.

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29 Nov 2019 18:55 #35428 by Cheryl
Replied by Cheryl on topic 2010 Cadillac CTS - Battery Reset
What’s it look like at another module or even at the data link connector?

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29 Nov 2019 21:08 #35433 by robert.lesaca
Replied by robert.lesaca on topic 2010 Cadillac CTS - Battery Reset
I have tried other modules yet...I just finishede checking the integrated power/fuse and relay box and noticed that the two bolts holding the main connectors was loose, hmmm just wondering if can be a cause

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