Signal LCS652, Installation And Operating Instruction Manual

-11- 

TROUBLESHOOTING 

Symptom

Possible Cause

Check

No power 

Power source not turned on 
Connector loose 
Amplifier 15A fuse blown 
    
 
Loose connection at power 
source 

Is ignition switch in AUX or ON position? 
Do you hear a “pop” when turned on?  
Is power hooked up backwards? Positive  
  ground vehicle? 
Is an external fuse or circuit breaker used? 
Are the negative leads connected to a good 
  ground? 

No siren 
tone  

High voltage protection 
Bad speaker or speaker wiring 

Input voltage must be less than 16 volts. 
Check for a short or an open in the output. 

Distorted 
siren sound 

Speaker assembly loose 
Intermittent Aux. Input  
  connection 
High vehicle voltage 

Is the speaker bell or tip loose? 
Is the Aux. Input used and wired properly? 
 
Input voltage must be less than 16 volts. 

Intermittent 
siren tone 

High voltage protection 
 
Circuit breaker in supply  
 
Bad Connection 
 
Shorted speaker or speaker wire

Is the vehicle voltage regulator working  
  properly? 
Is a circuit breaker used with at least a 50A
  rating? 
Is the connector tight on the back of the 
  unit?  
Does the speaker have water damage, or is 
  a wire pinched? 

Horn 
function or 
Manual 
function 
stuck on 

Horn switch stuck 
 
MAN switch stuck 
 
Aux. Input improperly 
  connected 
Aux. Horn Input Polarity  
  reversed 

Does the horn switch return fully when  
  released? 
Does the MAN push-button switch return 
  fully when released? 
Is the AUX Input used and wired properly?
 
Is the AUX horn wire wired for correct    
  polarity?   

Wrong 
siren tone 

Two-Tone option jumper  
  installed 
Aux. Horn Input Polarity  
  reversed   

Is the TT jumper option properly  
  configured? 
Is the AUX horn wire wired for correct    
  polarity? 

Phaser not 
working 

Phaser disabled 

Is the TD jumper option configured  
  properly?