Step
| Action
| Value(s)
| Yes
| No
|
1
| Does the reduced reception or lack of reception occur with more than
one radio station?
| --
| Go to
Step 3
| Go to
Step 2
|
2
| Complete
the following steps in order to test the vehicle electrical system for the
cause of interference at a particular frequency:
- Turn the ignition switch to the ON position.
- Tune the radio to the affected station.
- Remove one fuse at a time until the faulty circuit is identified.
- Make the necessary repair to the faulty circuit.
Has the repair been made?
| --
| Go to
Diagnostic System Check - Radio/Audio System
| --
|
3
|
- Disconnect the negative battery cable.
- Disconnect the antenna lead-in connector at the radio receiver.
- Use a J 39200
in order to measure the resistance between the antenna lead-in connector ground
to the battery ground cable.
Is the resistance greater than the specified value?
| 0.15ohms
| Go to
Step 4
| Go to
Step 5
|
4
|
- Disconnect the antenna lead-in connector at the windshield.
- Use a J 39200
in order to measure the resistance between the coaxial shield ground (G390)
and the radio connector shielded circuit.
Is the resistance greater than the specified value?
| 0.2ohms
| Go to
Step 8
| Go to
Step 10
|
5
| Use a J 39200
in order to measure the resistance at the center conductor
(signal feed) between the antenna connector and the radio connector.
Is the resistance greater than the specified value?
| 2ohms
| Go to
Step 7
| Go to
Step 6
|
6
| Use a J 39200
in order to measure the resistance at the center conductor (signal
feed) and the coaxial ground (shielding).
Is the resistance less than the specified value?
| OL (infinite)
| Go to
Step 9
| Go to
Step 11
|
7
|
- Inspect the coaxial cable and the inter-connects for a faulty
connection or corrosion.
- Repair the cable and the inter-connects as needed.
- If the cable and the inter-connects are OK, replace the antenna
coaxial cable.
Has the repair been made?
| --
| Go to
Diagnostic System Check - Radio/Audio System
| --
|
8
|
- Inspect the coaxial cable ground at C290 for a faulty or corroded
connection.
- Repair the ground as needed.
- If the ground is OK, replace the coaxial cable.
Has the repair been made?
| --
| Go to
Diagnostic System Check - Radio/Audio System
| --
|
9
| Replace the affected section of the coaxial cable.
Has the repair been made?
| --
| Go to
Diagnostic System Check - Radio/Audio System
| --
|
10
| Repair the faulty connection or corrosion at G390 (coaxial ground cable).
Has the repair been made?
| --
| Go to
Diagnostic System Check - Radio/Audio System
| --
|
11
|
- Inspect the coaxial connector at the windshield for a faulty connection
or corrosion.
- Replace the radio with a known good radio.
- If the reception is not improved, replace the windshield.
Has the repair been made?
| --
| Go to
Diagnostic System Check - Radio/Audio System
| --
|
