LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1330 (Entertainment System) >> Diagnostic Information and Procedures >> Radio Poor Reception

Radio Poor Reception

WARNING: This page is about a different car, the 2004 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.
Radio Poor Reception

Step Action Value(s) Yes No
1 Did you perform the Radio/Audio System Diagnostic System Check? - Go to Step 2  Go to Diagnostic System Check - Radio/Audio System 
2
  1. Turn ON the ignition, with the engine OFF.
  2. Turn ON the radio.
  3. Tune the radio to a known strong AM station then to a known strong FM station.
Is the radio reception clear?		 - Go to Audio System Troubleshooting Hints  Go to Step 3 
3
  1. Inspect the antenna coaxial cable for proper connections at the antenna amplifier module.
  2. Inspect both harness connectors at the antenna amplifier module for proper connections. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 18  Go to Step 4 
4 Does poor or no reception occur only on AM? - Go to Step 5  Go to Step 6 
5
  1. Turn OFF the ignition.
  2. Disconnect the antenna amplifier module harness connector C1.
  3. Turn ON the ignition, with the engine OFF.
  4. Turn ON the radio.
  5. Measure the voltage from connector C1 terminal 2 to a good ground.
Does the voltage measure near the specified value?		 12 V Go to Step 6  Go to Step 9 
6
  1. Turn OFF the ignition.
  2. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnect/Connect Procedure .
  3. Remove the radio. Refer to Radio Replacement  for service procedure.
    4. IMPORTANT: Always zero out the DMM before taking a resistance measurement to ensure an accurate reading.
  4. Measure the resistance between the negative battery cable and the radio antenna coaxial ground at the radio.
Does the resistance measure greater than the specified value?		 0.20 Ω Go to Step 10  Go to Step 7 
7
IMPORTANT: Always zero out the DMM before taking a resistance measurement to ensure an accurate reading.
  1. Remove the antenna coaxial cable from the radio and antenna amplifier module.
  2. Measure the resistance of the antenna cable center conductor between the radio and the antenna amplifier module.
Does the resistance measure greater than the specified values?		 RG-58/RG-59 Coax: 0.20 Ω
RG-62/RG-62M Coax: 3.5 Ω		 Go to Step 11  Go to Step 8 
8
  1. Test for continuity between the antenna coaxial cable center conductor and metal case.
  2. Test at the opposite end of the antenna cable also.
Did you measure continuity?		 - Go to Step 15  Go to Step 12 
9 Test the antenna relay coil voltage circuit for an open, short to ground or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 18  Go to Step 13 
10 Test the antenna amplifier module case ground for an open or high resistance. Refer to Circuit Testing in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 18  Go to Step 14 
11 Inspect the antenna coaxial cable interconnects for a poor connection or corrosion. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 18  Go to Step 15 
12 Inspect for poor connections at the antenna amplifier module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 18  Go to Step 16 
13 Inspect for poor connections at the radio. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 18  Go to Step 17 
14 Test for an open or high resistance from the negative battery cable to body ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 18  Go to Step 11 
15 Replace the antenna coaxial cable.
Did you complete the replacement?		 - Go to Step 18  -
16 Replace the antenna amplifier module.
Did you complete the replacement?		 - Go to Step 18  -
17 Replace the radio. Refer to Radio Replacement .
Did you complete the replacement?		 - Go to Step 18  -
18 Operate the system in order to verify the repair.
Did you correct the condition?		 - System OK Go to Step 2 
scientia non olet · About LEMON Manuals