Hey everyone,
I recently purchased a 2015 Mazda CX-5 Touring with 78k miles for my daughter. Just about four weeks after the purchase, the driver's side door lock started acting strangely. The key fob wouldn't lock the driver's side door, even after replacing the battery and trying the spare key fob. Interestingly, using the key blade from the fob allowed me to lock and unlock the doors. However, both the key fob and the master switch on the driver's side failed to lock the driver's side door, although they worked fine for the other doors and hatch. Additionally, the car horn no longer sounded after locking the door twice with the key fob.
Despite trying various troubleshooting steps, including replacing the door actuator with a new part from Mazda, borrowing a friend's driver's side door master switch, and swapping out the fuse twice, the issue persisted. Online research led me to suspect the rear BCM (body control module) might be faulty, but testing disproved this theory.
In a last-ditch effort, I downloaded and installed Forscan scanning software and purchased a Forscan scanner OBDC reader from Amazon. Surprisingly, it worked, and I was able to retrieve error codes: B1172 and B126A. After researching these codes, I discovered that B1172 indicates a circuit short to ground in the rear BCM, while B126A relates to a symptom with the driver's door interior lock.
I apologize for the lengthy explanation, but I wanted to provide a detailed account of my troubleshooting efforts in the hopes of assisting others facing similar issues. If anyone has insight into what these codes mean before I resort to taking the CX-5 to a shop, I would greatly appreciate it.
Thank you in advance!
Jat
I recently purchased a 2015 Mazda CX-5 Touring with 78k miles for my daughter. Just about four weeks after the purchase, the driver's side door lock started acting strangely. The key fob wouldn't lock the driver's side door, even after replacing the battery and trying the spare key fob. Interestingly, using the key blade from the fob allowed me to lock and unlock the doors. However, both the key fob and the master switch on the driver's side failed to lock the driver's side door, although they worked fine for the other doors and hatch. Additionally, the car horn no longer sounded after locking the door twice with the key fob.
Despite trying various troubleshooting steps, including replacing the door actuator with a new part from Mazda, borrowing a friend's driver's side door master switch, and swapping out the fuse twice, the issue persisted. Online research led me to suspect the rear BCM (body control module) might be faulty, but testing disproved this theory.
In a last-ditch effort, I downloaded and installed Forscan scanning software and purchased a Forscan scanner OBDC reader from Amazon. Surprisingly, it worked, and I was able to retrieve error codes: B1172 and B126A. After researching these codes, I discovered that B1172 indicates a circuit short to ground in the rear BCM, while B126A relates to a symptom with the driver's door interior lock.
I apologize for the lengthy explanation, but I wanted to provide a detailed account of my troubleshooting efforts in the hopes of assisting others facing similar issues. If anyone has insight into what these codes mean before I resort to taking the CX-5 to a shop, I would greatly appreciate it.
Thank you in advance!
Jat