GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1999 🢒 Monte Carlo 🢒 Body and Accessories 🢒 Wiring Systems 🢒 Radio Poor Reception

Step

Action

Value(s)

Yes

No

Important: Complete the following steps before you measure the resistance of the antenna:

   • Remove the lead of the battery.
   • Zero the DMM. This action will help prevent a misdiagnosis.
Use the DMM in order to measure the resistance between the coax (outer conductor) harness connector and the negative battery cable.

1
  1. Disconnect the negative battery cable.
  2. Disconnect the antenna lead-in harness connector at the radio receiver.
  3. Use a DMM in order to 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 antenna base.

Does the meter indicate continuity intermittently?

--

Go to Step 8

Go to Step 3

3

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

--

Go to Step 4

Go to Step 5

4

Is the measured resistance less than the specified value?

0.2 ohms

Go to Step 6

Go to Step 7

5

For RG-62 or RG-62M, is the measured resistance less than the specified value?

3.5 ohms

Go to Step 6

Go to Step 7

6

While observing the DMM, wiggle the antenna coax.

Does the meter indicate continuity intermittently?

--

Go to Step 7

Go to Step 8

7

Replace coaxial cable. Refer to Radio Antenna Cable Extension Cable Replacement for service procedure.

Is the repair complete?

--

Go to Radio/Audio System Check

--

8

Replace the antenna. Refer to Fixed Antenna Mast Replacement or Radio Antenna Replacement for service procedure.

Is the repair complete?

--

Go to Radio/Audio System Check

--