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Home >> Jeep >> 2014 >> Wrangler Sahara, Standard Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 181 ((Hands Free Module (HFM) - Electrical Diagnostics)) >> DTC Troubleshooting >> B143A-13-Microphone 1 - Circuit Open >> Theory Of Operation

Theory Of Operation

WARNING: This page is about a different car, the 2016 Dodge Journey and 2015 Dodge Journey. However, it is still accessible from the selected car via links, so may be relevant.

The Hands Free Module (HFM) controls and monitors both the (X712) microphone 1 input circuit (+) and the (X792) microphone 1 input circuit (-) for a concern. The HFM communicates over the CAN-AT Bus. The microphone is located in the rearview mirror.

For a detailed description of the Hands Free System. Refer to MODULE, HANDS FREE, DESCRIPTION .

For additional information regarding the operation of the Hands Free System. Refer to MODULE, HANDS FREE, OPERATION .

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