GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 1999 🢒 Grand Prix 🢒 Body and Accessories 🢒 Entertainment 🢒 Radio Poor Reception

Step

Action

Value(s)

Yes

No

Important: Before measuring the resistance of the antenna perform the following steps:

  1. Remove the negative lead of the battery.
  2. Zero the digital multimeter (DMM).
In order to measure the resistance, cautiously wiggle the lead-in tip and cable.

The readings below should always be obtained. If the readings do not match, some portion of the lead-in is intermittent and should be replaced.

Zero the DMM before taking measurements in order to avoid misdiagnosis. Use the DMM in order to measure the resistance between the coaxial (the outer conductor) harness connector and the negative battery cable.

1

    Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

  1. Disconnect the negative battery cable.
  2. Disconnect the antenna lead-in harness connector at the radio receiver.
  3. Connect a digital multimeter (DMM).
  4. Measure the resistance between the antenna lead-in harness connector and ground.

Is the reading greater than the specified value?

0.15 ohms

Go to Step 8

Go to Step 2

2
  1. Leave the DMM connected.
  2. Wiggle the antenna lead-in harness connector at the radio antenna module.

Does the meter indicate intermittent continuity?

--

Go to Step 8

Go to Step 3

3

Check the coaxial cable type.

Is the cable type RG-58 or RG-59?

--

Go to Step 4

Go to Step 5

4

Measure the resistance.

Is the reading less than specified?

0.2 ohms

Go to Step 6

Go to Step 10

5
  1. Check the coaxial cable type.
  2. Verify that the cable type is RG-62 or RG-62M.

Is the resistance close to the measured value?

3.5 ohms

Go to Step 6

Go to Step 10

6

Wiggle the antenna coaxial cable at the interconnects while observing the DMM.

Does the meter indicate intermittent continuity?

--

Go to Step 10

Go to Step 7

7
  1. Disconnect the radio antenna module harness connector.
  2. Using a test light, connect the radio antenna module harness connector between terminal A and terminal B.

Does the test light illuminate?

--

Go to Step 11

Go to Step 9

8
  1. Check the radio antenna module for a poor connection or corrosion.
  2. Check the coaxial cable interconnects for a poor connection or corrosion.

Are the connections clean, tight and free of corrosion?

--

Go to Step 11

Go to Step 10

9

Using a test light, connect between the radio antenna module harness connector terminal A and ground.

Does the test light illuminate?

--

Go to Step 12

Go to Step 13

10
  1. Inspect the coaxial interconnects for a poor connection and corrosion.
  2. Repair the antenna coaxial cable as needed.
  3. Replace the antenna coaxial cable if necessary. Refer to Radio Antenna Cable Extension Cable Replacement for the service procedure.

Is the repair complete?

--

Go to Diagnostic System Check - Radio/Audio System

--

11

Replace the radio antenna module. Refer to Antenna Amplifier Replacement for the service procedure.

Is the repair complete?

--

Go to Diagnostic System Check - Radio/Audio System

--

12

Repair a poor connection or open in circuit 351.

Is the repair complete?

--

Go to Diagnostic System Check - Radio/Audio System

--

13

Repair a poor connection or open in circuit 145.

Is the repair complete?

--

Go to Diagnostic System Check - Radio/Audio System

--