DEFINITION: This table is used for diagnosing a radio system that has poor sound quality with the radio ON. Normal sound is heard whenever the tape player or the CD player is used.

Were you sent here from the Radio/Audio System Check?

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Go to Step 2

Go to Radio/Audio System Check

1. Verify the customer's complaint with the station(s) that are normally received in your area.
2. Compare the complaint vehicle with a similar vehicle in the same locations that the concern is observed.

Do both vehicles perform the same?

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Go to Step 3

Go to Step 4

1. Explain to customer the normal operation of the radio observed in both vehicles.
2. If the customer is still unsatisfied, refer to Auto Manufacturer's Customer Relations Department for further assistance.

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1. Disconnect the coaxial cable from the rear of the radio.
2. Temporarily mount a test antenna to the vehicle.
3. Ground the antenna base and check the ground with a DMM before plugging the coax into the radio.
4. Connect the coaxial cable from the temporary test antenna to the back of the radio.
5. Do not hold the antenna in your hand.
6. Turn the ignition switch the ON position.
7. Turn the radio ON and set the tuner to a strong radio station.

Does the radio reception improve?

--

Go to Step 7

Go to Step 5

1. Compare the reception with the ignition switch in different positions.
2. First, turn the ignition switch to the ON position with the engine not running.
3. Second, start the engine and let it run for a while.

Does the reception improve with the engine not running?

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Go to Speaker Noise - Accessory

Go to Step 6

Replace the radio. Refer to Radio Replacement .

Is the repair complete?

--

Go to Radio/Audio System Check

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1. Disconnect the coaxial cable at the radio antenna module (coaxial cable between the radio and radio antenna module).
2. Connect a DMM between the tips at each end of the coaxial cable.
3. Check for continuity of the antenna coaxial cable (center conductor wire) from the radio to the radio antenna module.

Is the center conductor wire (coaxial cable) continuous between these two points?

--

Go to Step 8

Go to Step 12

1. Connect a DMM between the braided wire shield at each end of the coaxial cable (coaxial cable between the radio and radio antenna module).
2. Check for continuity of the antenna coaxial cable (braided wire) from the radio to the radio antenna module.

Is the braided wire (coaxial cable) continuous between these two points?

--

Go to Step 9

Go to Step 12

1. Connect a DMM between the braided wire shield and the center conductor wire tip at one end of the coaxial cable (coaxial cable between the radio and radio antenna module).
2. Check for continuity between the braided wire and the center conductor wire of the antenna coaxial cable between the radio and the radio antenna module.

Is the braided wire shorted to the center conductor wire?

--

Go to Step 12

Go to Step 10

1. Connect a DMM between ground and the braided wire shield at the end of the coaxial cable (coaxial cable between the radio and radio antenna module).
2. Check for continuity between the braided wire and ground.

Is the braided wire shorted to ground?

--

Go to Step 12

Go to Step 11

1. Connect a DMM between ground and the center conductor wire tip at the end of the coaxial cable (coaxial cable between the radio and radio antenna module).
2. Check for continuity between the center conductor wire tip and ground.

Is the center conductor wire shorted to ground?

--

Go to Step 12

Go to Step 13

Replace the coaxial cable between the radio and radio antenna module. Refer to Coaxial Cable Replacement .

Is the repair complete?

--

Go to Radio/Audio System Check

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1. Reconnect the radio connectors C1, C2, and C3.
2. Connect a test light between the antenna module connector terminal 2 and ground.
3. Turn the ignition to the ON position.
4. Turn the radio to the ON position.

Does the test light illuminate?

--

Go to Step 17

Go to Step 14

1. Disconnect the radio connector C1.
2. Connect a DMM between the radio connector C1 terminal 8 and the radio antenna module connector terminal 2.
3. Measure the resistance of CKT 145.

is the resistance within specified values?

0-2 ohms

Go to Step 15

Go to Step 16

Repair the open in CKT 145 between the radio and the radio antenna module. Refer to Radio Antenna Module Replacement .

Is the repair complete?

--

Go to Radio/Audio System Check

--

Replace the radio. Refer to Radio Replacement .

Is the repair complete?

--

Go to Radio/Audio System Check

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1. Connect a DMM between the antenna module connector terminal 3 and ground.
2. Turn the ignition to the ON position.
3. Turn the radio to the ON position.
4. Measure the voltage at the antenna module connector terminal 3.

Is the voltage within the specified values?

10.0-14.0V

Go to Step 22

Go to Step 18

1. Disconnect the radio connector C1.
2. Connect a DMM between the antenna module connector terminal 3 and the radio connector C1 terminal 6.
3. Check for continuity of CKT 314 between the radio and the radio antenna module.

Is CKT 314 continuous between these two connectors?

--

Go to Step 19

Go to Step 20

1. Connect a DMM between the antenna module connector terminal 3 and ground.
2. Check for continuity of CKT 314 to ground.

Is CKT 314 shorted to ground?

--

Go to Step 21

Go to Step 16

Repair the open in CKT 314 between the radio and the radio antenna module.

Is the repair complete?

--

Go to Radio/Audio System Check

--

Repair a short to ground in CKT 314 between the radio and the radio antenna module.

Is the repair complete?

--

Go to Radio/Audio System Check

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1. Disconnect the coaxial cable at the radio antenna module (coaxial cable between the front window and radio antenna module).
2. Disconnect the front window antenna connector (center conductor wire).
3. Connect a DMM between the tip of the coaxial cable at the radio antenna module and the front window terminal connector.
4. Check for continuity of the antenna coaxial cable (center conductor wire) from the radio antenna module to the front window connector.

Is the center conductor wire (coaxial cable) continuous between these two points?

--

Go to Step 23

Go to Step 27

1. Disconnect the braided ground strap from the front window.
2. Connect a DMM between the braided wire shield at the end of the coaxial cable and the braided ground strap at the front window (coaxial cable between the front window and the radio antenna module).
3. Check for continuity of the antenna coaxial cable (braided wire) from the front window to the radio antenna module.

Is the braided wire (coaxial cable) continuous between these two points?

--

Go to Step 24

Go to Step 27

1. Connect a DMM between the braided wire shield and the center conductor wire tip at the end of the coaxial cable (coaxial cable between the front window and the radio antenna module).
2. Check for continuity between the braided wire shield and the center conductor wire (antenna coaxial cable between the front window and the radio antenna module.

Is the braided wire shorted to the center conductor wire?

--

Go to Step 27

Go to Step 25

1. Connect a DMM between ground and the braided wire shield at the end of the coaxial cable (coaxial cable between the front window and radio antenna module).
2. Check for continuity between the braided wire and ground.

Is the braided wire shorted to ground?

--

Go to Step 27

Go to Step 26

1. Connect a DMM between ground and the center conductor wire tip at the end of the coaxial cable (coaxial cable between the front window and radio antenna module).
2. Check for continuity between the center conductor wire tip and ground.

Is the center conductor wire shorted to ground?

--

Go to Step 27

Go to Step 28

Replace the coaxial cable between the front window and radio antenna module. Refer to Antenna Cable Replacement .

Is the repair complete?

--

Go to Radio/Audio System Check

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1. Connect the negative lead of the DMM to the front window antenna terminal.
2. Connect the positive lead of the DMM to each of the ends of the antenna grid line on the front windshield.
3. Measure the resistance between the front window antenna terminal and both of the outer ends of the antenna grid lines.

Is the resistance within the specified values during each measurement?

0.5-1.0ohms

Go to Step 29

Go to Grid Line Repair

1. Disconnect the rear window antenna buffer connector.
2. Disconnect the rear window antenna terminal connector.
3. Connect the DMM to each of the ends of the rear antenna jumper wire.
4. Measure the rear antenna jumper wire for continuity between these two connectors.

Is the rear antenna jumper wire continuous between these two connectors?

--

Go to Step 31

Go to Step 30

Replace the jumper wire between the rear window antenna buffer and the rear window antenna terminal. Refer to Antenna Cable Replacement .

Is the repair complete?

--

Go to Radio/Audio System Check

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1. Disconnect the coaxial cable at the radio antenna module (coaxial cable between the rear window antenna buffer and the radio antenna module).
2. Disconnect the antenna coaxial cable from the rear window antenna buffer.
3. Connect a DMM between the tips at each end of the coaxial cable at the radio antenna module and the rear window antenna buffer.
4. Check for continuity of the antenna coaxial cable (center conductor wire) from the radio antenna module to the rear window antenna buffer.

Is the center conductor wire (coaxial cable) continuous between these two points?

--

Go to Step 32

Go to Step 36

1. Connect a DMM between the braided wire shield at each end of the coaxial cable (coaxial cable between the rear window antenna buffer and the radio antenna module).
2. Check for continuity of the antenna coaxial cable (braided wire) from the rear window antenna buffer to the radio antenna module.

Is the braided wire (coaxial cable) continuous between these two points?

--

Go to Step 33

Go to Step 36

1. Connect a DMM between the braided wire shield and the center conductor wire tip at the end of the coaxial cable (coaxial cable between the rear window antenna buffer and the radio antenna module).
2. Check for continuity between the braided wire shield and the center conductor wire (antenna coaxial cable between the rear window antenna buffer and the radio antenna module.

Is the braided wire shorted to the center conductor wire?

--

Go to Step 36

Go to Step 34

1. Connect a DMM between ground and the braided wire shield at the end of the coaxial cable (coaxial cable between the rear window antenna buffer and the radio antenna module).
2. Check for continuity between the braided wire and ground.

Is the braided wire shorted to ground?

--

Go to Step 36

Go to Step 35

1. Connect a DMM between ground and the center conductor wire tip at the end of the coaxial cable (coaxial cable between the rear window antenna buffer and the radio antenna module).
2. Check for continuity between the center conductor wire tip and ground.

Is the center conductor wire shorted to ground?

--

Go to Step 36

Go to Step 37

Replace the coaxial cable between the rear window antenna buffer and the radio antenna module. Refer to Radio Antenna Cable Extension Cable Replacement .

Is the repair complete?

--

Go to Radio/Audio System Check

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Check the integrity of the rear window antenna grid lines and the rear window antenna terminal.

Are the rear window antenna grid lines and terminal OK?

--

Go to Step 38

Go to Grid Line Repair

1. Reconnect all radio connectors.
2. Reconnect all front window antenna connectors.
3. Reconnect all connections at the radio antenna module except for the rear window antenna input.
4. Temporarily mount a test antenna to the vehicle.
5. Ground the antenna base and check the ground with a DMM.
6. Connect the coaxial cable from the test antenna to rear window antenna input at the radio antenna module.
7. Do not hold the antenna in your hand.
8. Turn the ignition switch the ON position.
9. Turn the radio ON and set the tuner to a strong radio station.

Does the radio reception improve?

--

Go to Step 39

Go to Step 40

Replace the rear window antenna buffer. Refer to Antenna Buffer Replacement .

Is the replacement complete?

--

Go to Radio/Audio System Check

--

Replace the radio antenna module. Refer to Radio Antenna Module Replacement .

Is the replacement complete?

--

Go to Radio/Audio System Check

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DEFINITION: This table is used for diagnosing a radio system that has poor sound quality with the radio ON and a normal operating antenna. Normal sound is heard whenever the tape player or the CD player is used.

Were you sent here from the Radio/Audio System Check?

--

Go to Step 2

Go to Radio/Audio System Check

1. Verify the customer's complaint with the station(s) that are normally received in your area.
2. Compare the complaint vehicle with a similar vehicle in the same locations that the concern is observed.

Do both vehicles perform the same?

--

Go to Step 3

Go to Step 4

1. Explain to customer the normal operation of the radio observed in both vehicles.
2. If the customer is still unsatisfied, refer to Auto Manufacturer's Customer Relations Department for further assistance.

--

--

--

1. Disconnect the coaxial cable from the rear of the radio.
2. Temporarily mount a test antenna to the vehicle.
3. Ground the antenna base and check the ground with a DMM before plugging the coax into the radio.
4. Connect the coaxial cable from the temporary test antenna to the back of the radio.
5. Do not hold the antenna in your hand.
6. Turn the ignition switch the ON position.
7. Turn the radio ON and set the tuner to a strong radio station.

Does the radio reception improve?

--

Go to Step 7

Go to Step 5

1. Compare the reception with the ignition switch in different positions.
2. First, turn the ignition switch to the ON position with the engine not running.
3. Second, start the engine and let it run for a while.

Does the reception improve with the engine not running?

--

Go to Speaker Noise - Accessory

Go to Step 6

Replace the radio. Refer to Radio Replacement .

Is the repair complete?

--

Go to Radio/Audio System Check

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1. Disconnect the coaxial cable at the radio power antenna.
2. Connect a DMM between the tips at each end of the coaxial cable.
3. Check for continuity of the antenna coaxial cable (center conductor wire) from the radio to the radio power antenna.

Is the center conductor wire (coaxial cable) continuous between these two points?

--

Go to Step 8

Go to Step 12

1. Connect a DMM between the braided wire shield at each end of the coaxial cable.
2. Check for continuity of the antenna coaxial cable (braided wire) from the radio to the radio power antenna.

Is the braided wire (coaxial cable) continuous between these two points?

--

Go to Step 9

Go to Step 12

1. Connect a DMM between the braided wire shield and the center conductor wire tip at one end of the coaxial cable.
2. Check for continuity between the braided wire and the center conductor wire of the antenna coaxial cable between the radio and the radio power antenna.

Is the braided wire shorted to the center conductor wire?

--

Go to Step 12

Go to Step 10

1. Connect a DMM between ground and the braided wire shield at the end of the coaxial cable.
2. Check for continuity between the braided wire and ground.

Is the braided wire shorted to ground?

--

Go to Step 12

Go to Step 11

1. Connect a DMM between ground and the center conductor wire tip at the end of the coaxial cable.
2. Check for continuity between the center conductor wire tip and ground.

Is the center conductor wire shorted to ground?

--

Go to Step 12

Go to Step 13

Replace the coaxial cable between the radio and radio power antenna. Refer to Radio Antenna Cable Extension Cable Replacement .

Is the repair complete?

--

Go to Radio/Audio System Check

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1. Carefully inspect the radio power antenna assembly.
2. Inspect both grounds straps for looseness or corrosion.
3. Inspect all mounting points for the radio power antenna assembly.
4. Inspect all related wiring and connectors at the radio power antenna.

Are the ground straps, mounting hardware, and related wiring in good condition?

--

Go to Step 14

Go to Step 15

Repair the ground straps, mounting hardware, or related wiring concern. Refer to Antenna Cable Strap Replacement .

Is the repair complete?

--

Go to Radio/Audio System Check

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Replace the radio power antenna assembly. Refer to Power Antenna Assembly Replacement .

Is the repair complete?

--

Go to Radio/Audio System Check

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