Did you review the power antenna circuit description and operation and perform the necessary inspections?

--

Go to Step 2

Go to Symptoms

1. Place the ignition switch in RUN.
2. Compare the radio's reception of a weak station to that of a known good radio.
3. Ensure that both vehicles are positioned equivalently in order to equalize the possible differences in the noise or the reception levels.
4. After the comparisons are made, turn OFF the radios.

Is the radio's reception equivalent to the known good radio with no significant difference in noise levels?

--

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

1. Disconnect the radio antenna lead-in wire at the radio.
2. Connect a pre-zeroed ohmmeter J 39200 digital multimeter between the coax (outer) conductor of the radio antenna lead-in wire and ground.

Is the antenna resistance to ground equal to or greater than the specified value?

0.15 ohms

Go to Step 4

Go to Step 5

Replace the antenna coax cable. Refer to Radio Antenna Cable Extension Cable Replacement .

Is the radio sound quality good?

--

Go to Step 13

Go to Step 6

1. Wiggle the antenna mast and the lead-in wire.
2. Monitor the J 39200 digital multimeter for intermittent opens, refer to Testing for Electrical Intermittents in Wiring Systems.

Does the power antenna resistance to ground remain less than the specified value?

0.15 ohms

Go to Step 6

Go to Step 7

Connect a pre-zeroed ohmmeter J 39200 digital multimeter between the signal (inner) conductor of the radio antenna lead-in wire and the antenna mast.

Is the antenna lead-in wire signal resistance less than the specified value?

2 ohms (RG-58) or 3.5 ohms (RG-62 or RG-62M)

Go to Step 8

Go to Step 9

Replace the antenna coax cable. Refer to Radio Antenna Cable Extension Cable Replacement .

Is the radio sound quality good?

--

Go to Step 13

Go to Step 6

1. Wiggle the antenna mast and the lead-in wire.
2. Monitor the ohmmeter J 39200 digital multimeter for intermittent opens.

Does the antenna lead-in wire signal resistance remain less than the specified value?

2 ohms (RG-58) or 3.5 ohms (RG-62 or RG-62M)

Go to Step 10

Go to Step 11

Replace the antenna coax cable. Refer to Radio Antenna Cable Extension Cable Replacement .

Is the radio sound quality good?

--

Go to Step 13

Go to Step 10

1. Reconnect the antenna lead-in wire to the radio.
2. Place the ignition switch in RUN.
3. Play the radio.

Is the reception problem resolved?

--

Go to Step 13

Go to Step 12

Replace the antenna coax cable. Refer to Radio Antenna Cable Extension Cable Replacement .

Is the radio sound quality good?

--

Go to Step 13

Go to Step 10

1. Remove the radio. Refer to Radio Replacement .
2. Send the radio in for repair.

Is the repair complete?

--

Go to Step 13

--

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 3