What you will need
- Park the Cadillac on level ground and set the parking brakes.
- Open the driver's door and locate the OBD-2 port.
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- Plug your scanner into the OBD2 port
- Turn on the ignition by turning the key to position II. If your Cadillac has START/STOP feature, press the button without pressing the brake pedal.
- Allow your scanner to turn on. Follow the promptings on your scanner to read fault codes.
Diagnose Cadillac ABS (Anti-Lock Braking System)
Watch this video to learn how to use an ABS scanner to retrieve Cadillac Anti-lock Brake System codes.
Diagnose Cadillac Airbag Warning Light
Watch this video to learn how to use a multi-system scanner to troubleshoot a Cadillac Airbag Light that is on.
Basic OBD2 scanners can only be used to retrieve fault codes from the Engine Control Unit (ECU). Those are faults that trigger the Check Engine warning light on the dashboard.
To diagnose ABS and Airbag/SRS warning lights, a multi-system OBD-II scanner is needed. Here are some popular scanners you can use:
The procedure for reading Cadillac fault codes is similar, regardless of which scanner you are using.
When the Check Engine Light (CEL) or any other warning light such as ABS, Airbag, TPMS turn on or you get a warning message on Driver Information Center (DIC), a Diagnostic Trouble Code (DTC) gets stored in the corresponding control module.