Ford Escape: Accessory Charging / Description and Operation - Wireless Accessory Charging Module (WACM) - System Operation and Component Description

System Operation

System Diagram

Network Message Chart

  Module Network Input Messages APIM

  Module Network Input Messages WACM

System Operation

The WACM is powered at all times, using the vehicle’s battery. The WACM receives signals from the BCM signals and a hardwire) to indicate when an interior key search is performed, which the WACM responds by disabling the charge briefly, and resuming the charge after the event ends. A hardwired circuit from the BCM is a controlled FET that shorts to battery before and during the key search.

The BCM provides the WACM with signals to determine when to enable charging. For example, Ignition_Status and Delay Accy are used to enable wireless charging as a controller of the charge request. Another function of the BCM is to tell the WACM when an interior key fob search is about to take place. The BCM utilizes a FET to short the signal feed that the WACM receives from the BCM disabling the charge. When this occurs, the WACM disables the charging function to make sure it does not interfere with key fob searches.

The WACM directly sends a charge status message over the HS-CAN3 to the APIM . The APIM receives a status signal from the WACM and displays the following status messages in the Information and Entertainment Display Unit: Charge Not In Progress, Charge In Progress, Metal Object Detected.

The WACM is expected to charge a totally dead cell phone when no key is detected by the BCM .

The WACM also receives signals from the radio, so it knows when to shift frequency to avoid interfering with the AM radio.

The WACM sends signals to sync to display charging status updates such as wireless charger active and foreign/metal object detected, to the user.

The WACM features foreign object detection that detects when foreign objects (metals and non-metals) are placed between the device and the charging surface. When this is detected, the Information and Entertainment Display Unit displays a message until the condition is corrected. For additional tips on how to effectively use the wireless charger, refer to owners literature.

Some devices feature a built-in wireless charging capability. Customers should check with their phone manufacturer to determine if it supports wireless charging. Not all phones are compatible with wireless charging.

Component Description

BCM (Body Control Module)

The BCM is a multifunction module that supplies voltage signals and network messages to the WACM for the wireless charging function. For additional information about the BCM , refer to workshop manual (WSM) Group 419-10.

WACM (Wireless Accessory Charging Module)

The WACM is a 5 watt wireless power transmitter used to inductively charge a single Qi (chee) compatible mobile device. The WACM requires PMI when it is replaced.