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Home >> Cadillac >> 2017 >> ATS Base, 4D Sedan, RWD, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 174 (Cellular System, Entertainment System, And Navigation System - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC B125F: Front Center Speaker Motor >> Circuit/System Description
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Circuit/System Description

WARNING: This page is about a different car, the 2016 Cadillac CT6. However, it is still accessible from the selected car via links, so may be relevant.
Circuit Description
B+ Circuit is supplied with B+ via F30DAFuse.
Signal circuit terminal 3 Circuit is temporarily supplied with Battery Voltage to command state of device
Signal circuit terminal 4 Circuit is pulsed with Battery Voltage to control device direction
Signal circuit terminal 9 Signal Circuit to monitor status of device
Signal circuit terminal 7 Signal circuit to notify device is in full up position
Signal circuit terminal 8 Signal circuit to notify device is in full down position
Ground Chassis ground.
Component Description
T3 Audio Amplifier The module controls the diagnostic and functional properties of the Center Speaker.
P19B Speaker - Center Instrument Panel Component position will be raised and lowered when commanded by the amplifier.

When the amplifier is commanded on, a signal is sent to the speaker motor to wake up. Battery voltage is then pulsed for 5 seconds from the amplifier to the speaker motor. Once the speakers reach the desired position, battery voltage Is passed through one of the dedicated position lines.