Schematic Reference: Radio/Audio System Schematics

Did you perform the Radio/Audio System Description and Operation and perform the necessary inspections?

--

Go to Step 2

Go to Radio/Audio System Description and Radio/Audio System Operation

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 tune to a known strong FM station.

Is the radio reception clear ?

--

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step  3

Inspect for the following:

Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Did you find and correct the condition?

--

Go to Step  12

Go to Step  4

1. Turn OFF the ignition.
2. Disconnect the negative battery cable.
3. Remove the radio. Refer to Radio Replacement for service procedure.
4. Zero the digital multi-meter (DMM).
5. Measure the resistance between the negative battery cable and the radio coxial ground at the radio.

Is the resistance within the specified value?

0 - 0.6 ohms

Go to Step 5

Go to Step  6

1. Grasp the antenna mast.
2. Monitor the DMM and wiggle the antenna mast.

Does the DMM display intermittent continuity?

--

Go to Step  6

Go to Step  7

Inspect the antenna base for a proper connection to the body ground.

Did you find and correct the condition?

--

Go to Step  12

Go to Step  8

1. Remove the radio antenna coxial lead-in connector from the radio.
2. Measure the resistance between the radio antenna coaxial lead-in (center conductor) connector and the antenna mast with a DMM. Refer to Circuit Testing in Wiring Systems.

Is the measured resistance less than the specified values?

RG-58/RG-59 Coax: 0.2 ohms

RG-62/RG-62M Coax: 3.5 ohms

Go to Step  9

Go to Step  10

Inspect the ground connection from the battery negative cable to the body. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Did you find and correct the condition?

--

Go to Step  12

Go to Step  10

Test for continuity between the antenna coxial cable center conductor and metal case on both ends of the cable.

Did you measure continuity?

--

Go to Step  11

Go to Step  10

Inspect the radio 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  12

Go to Step  11

Repair or replace the radio antenna coaxial cable circuit.

Did you complete the repair or replacement?

--

Go to Step  12

--

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Audio System Troubleshooting Hints