DDM/ PDM
WARNING: This page is about a different car, the 2017 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
The DDM and PDM supply voltage and ground to illuminate their respective exterior mirror BLIS ®/ CTA LED based on messages received from the SODL and SODR. The modules are capable of storing BLIS ®/ CTA LED and lost communication Diagnostic Trouble Codes (DTCs) for the BLIS ® or CTA system when a concern exists. The DDM and PDM communicate through the MS-CAN.
The DDM and PDM require PMI when replaced. Refer to: Module Configuration - System Operation and Component Description .