GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

  1. Disconnect negative battery cable.
  2. Disconnect antenna lead-in harness connector at the radio receiver.
  3. Using a DMM, measure the resistance between the antenna lead-in harness connector and ground.

Is the resistance measured same as the specified value?

Greater than 0.15 ohms

Go to Step 7

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 intermittent continuity?

--

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 0.2ohms?

--

Go to Step 6

Go to Step 7

5

For RG-62 or RG-62M, does the measured resistance less than 3.5ohms?

--

Go to Step 6

Go to Step 7

6

While observing the DMM, wiggle the antenna mast.

Does the meter indicate intermittent continuity?

--

Go to Step 8

Go to Step 7

7

Check the coaxial cable interconnects for a poor connection or corrosion. Repair or replace the antenna coaxial circuit as necessary. Refer to Radio Antenna Cable Extension Cable Replacement or Radio Antenna Cable Extension Cable Replacement for service procedure.

Is the repair complete?

--

Go to Diagnostic System Check - Radio/Audio System

--

8

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

Is the repair complete?

--

Go to Diagnostic System Check - Radio/Audio System

--