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BCM issue, some of the back light are not working

Tiny
DHEYAA
  • MEMBER
  • 2021 JEEP GRAND CHEROKEE
  • 3.6L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 6,000 MILES
I have a problem with BCM some of the backlights do not work and after checking it was found that it was a malfunction in BCM. My question is, how do I find the backlight lines in the BCM map specifically stop lamp and the turn signal. Help
Thursday, March 10th, 2022 AT 2:42 PM

7 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Hi,

The vehicle should be under warranty and this part replaced free of charge.

Regardless, I have attached the wiring schematics requested. One pic is of the signal circuit and the other is for the stop lamps.

Here is a link you may find helpful when testing:

https://www.2carpros.com/articles/how-to-check-wiring

Let me know if this is what you needed.

Take care,

Joe

See pics below.
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Thursday, March 10th, 2022 AT 6:53 PM
Tiny
DHEYAA
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  • 4 POSTS
Are these diagrams for BCM on the vehicle listed above?
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Friday, March 11th, 2022 AT 5:54 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Hi,

Yes, they are the specific circuits you requested and how they work with the BCM.

See pics below.

Joe
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Friday, March 11th, 2022 AT 12:52 PM
Tiny
DHEYAA
  • MEMBER
  • 4 POSTS
Thank you very much. You helped me. Can you provide me with a complete schematic of the taillights inside the BCM of my vehicle listed above?
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Friday, March 11th, 2022 AT 1:57 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Hi,

Are you referring to the printed circuit board in the BCM? That isn't something I would have. I do have the wiring schematics for the exterior lighting, but I need to know if you have an HID or non-HID lighting system.

Let me know if that will help you.

Take care,

Joe
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Friday, March 11th, 2022 AT 3:41 PM
Tiny
DHEYAA
  • MEMBER
  • 4 POSTS
I need just for exterior lighting. Or for taillight.
Yes, hid light system. This number BCM 68438 337AD.
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Friday, March 11th, 2022 AT 9:12 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Hi,

No problem. I attached the schematic below for the HID system. Note that the schematic is two pages long in my manual. I had to check each in half to make it readable for you. However, I did overlap them so you can follow from one to the next.

Let me know if this helps or if you have questions.

Take care,

Joe

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Saturday, March 12th, 2022 AT 12:07 PM

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