# Service bulletin 15521 A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned. - Type: Service bulletin - NHTSA id: 10137768 - Published by NHTSA: 2018\-05\-21 - Manufacturer's number: 15521 - Manufacturer's date: 2016\-04\-26 - NHTSA component: ELECTRICAL SYSTEM:IGNITION:ANTI\-THEFT:CONTROL MODULE; ELECTRICAL SYSTEM:12V/24V/48V BATTERY; ELECTRICAL SYSTEM:IGNITION ## NHTSA's summary 15521 ? Customer Advisory Letter. On these vehicles, if the side doors will not open from inside the vehicle due to low or no battery voltage, such as a discharged or disconnected battery, or if the vehicle is entered without the key fob or the fob is not working, customers are being advised that the driver and passenger side doors can still be opened from inside the vehicle by using the manual release levers located on the floor between the seats and the door openings. Also, if the vehicle's side doors will not open from outside the vehicle due to low or no battery voltage, such as a discharged or disconnected battery, or if the key fob is not working, customers are being advised that the driver side door can still be opened by using their key to manually open the vehicle's trunk and pulling the manual door release tab located in the trunk. ## The document - [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2016/MC-10137768-9999.pdf) - [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2016/MC-10137768-0001.pdf) The document is the manufacturer's. This site does not hold it. ## Components Electrical system, 12\-volt battery, Ignition ## Vehicles listed - 2011 to 2014 CADILLAC CTS - 2014 to 2016 CADILLAC ELR - 2004 to 2009 CADILLAC XLR - 2005 to 2016 CHEVROLET CORVETTE ## Recalls for the same vehicles and component - [14V394000](/recalls/nhtsa/14V394000.md), 2014-07-02: ELECTRICAL SYSTEM:IGNITION ## Other bulletins for the same vehicles and component - [PIP5130D](/bulletins/10253373.md), 2024-04-22, Service bulletin: ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM:IGNITION. Engine Cranks But Will Not Start May Set P00C6. - [PIP5130B](/bulletins/10253371.md), 2024-04-22, Service bulletin: ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM:IGNITION. Engine Cranks But Will Not Start May Set P00C6. - [PIE0296](/bulletins/10253123.md), 2024-04-15, Service bulletin: ELECTRICAL SYSTEM:IGNITION:ANTI\-THEFT:IMMOBILIZER/PROXIMITY:KEY/SENDER. Engineering Information - [20\-NA\-132](/bulletins/10252774.md), 2024-04-05, Service bulletin: ELECTRICAL SYSTEM; ELECTRICAL SYSTEM:12V/24V/48V BATTERY; ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL; EQUIPMENT. This warranty administration bulletin provides policy information on the requirements for 12V battery testing and warranty replacements. - [PIT5074H](/bulletins/10247061.md), 2023-12-11, Service bulletin: ELECTRICAL SYSTEM:12V/24V/48V BATTERY; ELECTRICAL SYSTEM. J\-35616\-64B Terminal Test Probe / Replacement Terminal / Terminated Lead. - [PIT5074G](/bulletins/10247060.md), 2023-12-11, Service bulletin: ELECTRICAL SYSTEM; ELECTRICAL SYSTEM:12V/24V/48V BATTERY. Terminal Test Probe And Replacement Terminal. - [1408117001a](/bulletins/10246506.md), 2023-12-11, Service bulletin: ELECTRICAL SYSTEM:BODY CONTROL MODULE/BCM; ELECTRICAL SYSTEM:12V/24V/48V BATTERY:CABLES; UNKNOWN OR OTHER. Unable to Clear BCM DTCs After Completing Repair - [140842001](/bulletins/10246503.md), 2023-12-11, Service bulletin: ELECTRICAL SYSTEM:12V/24V/48V BATTERY:CABLES; UNKNOWN OR OTHER; EXTERIOR LIGHTING:HEADLIGHTS:BULBS. Additional Diagnostic Tips for Headlamp Inoperative or Intermittent Conditions - [14497A](/bulletins/10245893.md), 2023-12-04, Service bulletin: ELECTRICAL SYSTEM; ELECTRICAL SYSTEM:IGNITION. Unintended Ignition Key Rotation - [14172B](/bulletins/10245885.md), 2023-12-04, Service bulletin: ELECTRICAL SYSTEM:IGNITION; ELECTRICAL SYSTEM. Unintended Ignition Key Rotation JSON: [/v1/bulletins/10137768](/v1/bulletins/10137768) [Report an error on this page](https://github.com/wenmar-pro/wenmar-open/issues/new?template=data_correction.yml&title=Data%20correction%3A%20Service%20bulletin%2015521&page=https%3A%2F%2Fopen.wenmarpro.com%2Fbulletins%2F10137768&vehicle=Service%20bulletin%2015521)