JBL JBLMR18.3 Troubleshooting Manual Download Page 2

 

1.0. Wiring Follow the wiring diagram above.   

 

The red ACC wire is designed as the trigger to turn the radio on. It recommended that this wire is connected to an 
on/off switch for purposes of lowering the current draw on the battery while the radio is not in use.   

 

Both red ACC and yellow battery wires must be connected to 12V+ for the radio to turn on.   

 

Ground (black) must be connected to a good 12V- source. Best source is directly to the battery.   

 

Speaker wires must be installed to the individual speaker’s terminals as labeled, positive and negative, respectively. 
Do NOT combine any speaker wires as this will cause permanent damage to the radio’s output IC. Tape off any unused 
speaker wires individually to prevent accidental shorting which can also harm the output IC.   

 

Antenna must be installed. 

 

Blue wire, labeled “AUTO ANT” is a remote wire for powered antennas/amplifiers/subwoofers. 

 

Rear/front line outputs are low level outputs with right/left and front/rear fade controls. This is for an output like an 
amplifier or subwoofer. 

 

Remote control cable is a 13 pin DIN style cable designed for wired remotes (see compatible products on the next 
page. 

 

AUX inputs are female RCA connectors for use with input devices. The stereo will NOT control any of these devices, 
but they will be heard through the stereo.   

 

Sirius cable is designed for use with a Sirius Tuner (see next page).   

 

Summary of Contents for JBLMR18.3

Page 1: ...wer 3 3 Buttons controls not responding or behaving erratically 3 4 Poor reception or no reception 3 5 No audio speaker audio is unevenly distributed or some speakers not working 3 6 Low audio 3 7 Flu...

Page 2: ...er wires as this will cause permanent damage to the radio s output IC Tape off any unused speaker wires individually to prevent accidental shorting which can also harm the output IC Antenna must be in...

Page 3: ...tuations a bad fuse can be spotted visually this may not always be the case The best method would be to use a multi meter or a test light Ensure the battery power supply is putting out at least 12V wh...

Page 4: ...remotes remote adaptors and extensions If the stereo returns to normal operation plug one attachment in at a time until the discovering the defective part Check all remote connections for water intrus...

Page 5: ...iPod or MP3 player make sure the volume is turned up Check speaker connections Ensure each speaker wire is routed to the appropriate speaker terminal for which it is intended Inspect all speaker wire...

Page 6: ...for more information If nothing else works initiate warranty claim if you are under warranty 3 10 CD door won t close open Initiate a warranty claim if you are under warranty 4 0 External Amplifier Is...

Page 7: ...corrosion or rust Replace Sirius tuner 5 2 2 Displays Check Antenna Antenna to satellite line of site is disrupted Check antenna connection to tuner for disconnection or looseness Check the same conne...

Page 8: ...othpick gently work the cooking spray between the shaft and rubber membrane lubrication the entire perimeter of the shaft DO NOT INSERT TOOTHPICK MORE THAN 1 16 INCH AS THIS CAN PUNCTURE THE RUBBER SE...

Page 9: ...sting Twist the knob in one direction and let go The knob should quickly bounce back to center Repeat the step above but now in the opposite directly Check other controls on the stereo for proper oper...

Page 10: ...8 0 Location of Production and Serial Numbers These numbers are found on the silver label location on the bottom of the radio s chassis See below example...

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