JBL System

OPERATION

Redundant Radio Control and Radio Knob Illumination
With the Main Light Switch in the "OFF" position, the Redundant Radio Control and Radio knob illumination bulbs are also off. With the Main Light Switch in "PARK" or "HEAD", battery voltage is applied to the I/P Dimming Rheostat. The I/P Dimming Rheostat controls the brightness of the Redundant Radio Control and Radio knob illumination bulbs by determining the voltage present on circuit 19 (LB/R). See Instrument Panel Illumination for more information.

Radio Time/Frequency Display Illumination
With the Main Light Switch in the "OFF" position, battery voltage is present at the Radio on circuit 434 (LB/BK). The Radio Time/Frequency Display illuminates at full brightness for maximum daytime visibility. With the Main Light Switch in "PARK" in "HEAD", battery voltage is applied to the I/P Dimming Rheostat. The I/P Dimming Rheostat controls the brightness of the Time/Frequency Display by determining the voltage present on circuit 434 (LB/BK). See Instrument Panel Illumination for more information.

Radio Memory and Operating Power
Voltage is present at the Radio at all times through Fuse 8 and circuit 54 (LG/Y). This constant power to the Radio maintains clock and station preset memory functions.

With the Ignition Switch in "ACC" or "RUN", voltage is also present at the Radio through Fuse 11 and circuit 137 (Y/BK). When the Radio is turned on, current flows through circuit 137 (Y/BK) and the Radio circuits to ground. The Radio turns on.

JBL Sound
Vehicles equipped with the JBL Sounds System have a trunk-mounted remote Radio Amplifier to power the Speakers and a trunk mounted Subwoofer Amplifier and Speaker Assembly. Power is available to the JBL Audio System Amplifier and Subwoofer Amplifier at all times through the FUSE PANEL Maxi-fuse and circuit 37 (Y). When the Radio is turned on, the remote Amplifiers are activated. The JBL Audio System Amplifier powers four speakers according to signals from the Radio. The JBL Audio System Amplifier also controls the Subwoofer Amplifier, which powers the special low frequency Subwoofer Assembly.

CD Player
Vehicles equipped with the High Level Audio or JBL Sound Systems may also be equipped with a CD Player. The CD Player provides audio signal outputs to the Radio, which passes the signals to the High Level Audio or JBL Sound System Amplifier.

Power Antenna
The Power Antenna is controlled by the Power Antenna Module. Voltage is present at the Power Antenna Module at all times on circuit 54 (LG/Y). With the Ignition Switch in "ACC" or "RUN", voltage is also present at the Power Antenna Module on circuit 137 (Y/BK). The Power Antenna Module controls operation of the reversible Power Antenna Motor, according to inputs provided by the Radio on circuit 747 (O/LB), the Ignition Switch on circuit 137 (Y/BK), and the Starting System on circuit 33 (W/PK).

When the Power Antenna Module applies voltage to circuit 745 (R/PK), the Power Antenna Motor runs to extend the antenna mast. When the Module applies voltage to circuit 746 (DG/Y) current flows through the Power Antenna Motor in the opposite direction and the mast retracts.