Was the Radio/Audio System Check performed?

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Go to Step 2

Go to Radio/Audio System Check

1. Connect a scan tool to the data link connector (DLC).
2. On the scan tool, select IRC data 1.
3. Move the vehicle out of the building. Tune the radio to several known strong local stations, both AM and FM.
4. Observe the signal strength on the scan tool while tuning radio.
5. Turn the ignition switch to OFF.
6. Unplug the RF IN connector from the back of the radio.
7. Plug in a substitute mast antenna.
8. Ground the antenna cable to the vehicle chassis.
9. Place the antenna in an upright position outside the vehicle. Do not hold the antenna in hand.
10. Turn the ignition switch to ON.
11. Tune the radio to the same stations as before, while monitoring the scan tool signal strength.

Does reception improve to at least 45 dB?

45 dB or higher

Go to Step 3

Go to Step 33

1. Turn the ignition switch to OFF.
2. Unplug the radio connector.
3. Unplug radio antenna module connector.
4. Using the appropriate adapters from the J 35616A kit, connect DMM to the radio antenna module harness connector terminal 2 and radio harness connector terminal F3.
5. Set the DMM to ohms scale.

Is the measured resistance in the range shown?

Less than 3.5ohms

Go to Step 5

Go to Step 4

Repair open in CKT 1487 (WHT).

Is the circuit repair complete?

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Go to Step 34

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Reconnect a DMM between radio antenna module harness connector terminal 3 and the radio harness connector terminal E4.

Is the measured resistance in the range shown?

Less than 5ohms

Go to Step 7

Go to Step 6

Repair open in CKT 1486 (RED).

Is the circuit repair complete?

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Go to Step 34

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1. Set the DMM to DC volts scale.
2. Disconnect DMM from the antenna module harness, and connect to a good ground.
3. Turn the ignition switch to ON.

Is the measured voltage in the range indicated?

0-0.3 V

Go to Step 8

Go to Step 9

Repair short to battery voltage in CKT 1486 (RED).

Is the circuit repair complete?

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Go to Step 34

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1. Turn the ignition switch to OFF.
2. Set DMM to ohms scale.

Is the measured resistance OL?

OL

Go to Step 11

Go to Step 10

Repair short to ground in CKT 1486 (RED).

Is the circuit repair complete?

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Go to Step 34

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1. Set the DMM to DC volts scale.
2. Disconnect the DMM from the radio harness connector terminal E4, and connect to radio harness connector terminal F3.
3. Turn the ignition switch to ON.

Is the measured voltage in the range shown?

0-0.3 V

Go to Step 12

Go to Step 13

Repair short to battery voltage in CKT 1487 (WHT).

Is the circuit repair complete?

--

Go to Step 34

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1. Turn the ignition switch to OFF.
2. Set the DMM to ohms scale.

Is the measured resistance OL?

OL

Go to Step 15

Go to Step 14

Repair short to ground in CKT 1487 (WHT).

Is the circuit repair complete?

--

Go to Step 34

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1. Disconnect the DMM from ground.
2. Using the appropriate adapter from the J 35616A kit, connect a test lead to radio harness connector terminal E4.

Is the measured resistance OL?

OL

Go to Step 17

Go to Step 16

Repair CKT 1486 (RED) short to CKT 1487 (WHT).

Is the circuit repair complete?

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Go to Step 34

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1. Connect the DMM between the radio antenna module case and a good ground.
2. Set the DMM to ohms scale.

Is the measured resistance in the range shown?

Less than 5ohms

Go to Step 19

Go to Step 18

Repair/clean radio antenna module ground.

Is the repair complete?

--

Go to Step 34

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1. Unplug the SIGNAL OUT coaxial connector from the radio antenna module.
2. Unplug the RF IN coaxial connector from the radio.
3. Connect the DMM between the inner contacts at both coax connectors.

Is the measured resistance in the range shown?

Less than 5ohms

Go to Step 20

Go to Step 22

Unplug the DMM from inner contacts of the coax connectors, and connect to the outer ring at both ends.

Is the measured resistance in the range shown?

Less than 5ohms

Go to Step 21

Go to Step 22

Disconnect the DMM from the outer ring at one end, and reconnect to the inner connector.

Is the measured resistance OL?

OL

Go to Step 23

Go to Step 22

Replace the coaxial cable.

Is the replacement complete?

--

Go to Step 34

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1. Unplug the rear antenna from radio antenna module.
2. Connect DMM between antenna lead connector and a good ground.

Is the measured resistance OL?

OL

Go to Step 24

Go to Step 31

1. Unplug the front antenna from the radio antenna module.
2. Connect a DMM between antenna lead connector center contact and outer ring.

Is the measured resistance OL?

OL

Go to Step 25

Go to Step 32

1. Connect a DMM between the antenna lead connector outer ring and a good ground.
2. Set the DMM to ohms scale.

Is the measured resistance in the range shown?

Less than 5ohms

Go to Step 27

Go to Step 26

Repair ground connection.

Is the repair complete?

--

Go to Step 34

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1. Unplug the front antenna lead from the windshield.
2. Set the DMM to ohms scale.
3. Remove the DMM connection from ground, and connect to the front antenna coaxial windshield connector center conductor.

Is the measured resistance in the range shown?

Less than 3.5ohms

Go to Step 28

Go to Step 32

1. Connect one DMM lead to the antenna connector on the glass.
2. Carefully touch the other lead to the end(s) of the metallic antenna film on the glass (farthest from the connector). Be careful not to damage the film.

Is the measured resistance in the range shown?

Less than 1ohms

Go to Step 30

Go to Step 29

Replace the rear window glass. Refer to Rear Window Replacement in Stationary Windows.

Is the replacement complete?

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Go to Step 34

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1. Replace the radio antenna module. Refer to Radio Antenna Module Replacement .
2. If problem persists, replace radio. Refer to Radio Replacement .

Is the replacement complete?

--

Go to Step 34

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Replace the antenna lead-in.

Is the replacement complete?

--

Go to Step 34

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Replace the coaxial antenna lead-in.

Is the replacement complete?

--

Go to Step 34

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Replace the radio. Refer to Radio Replacement .

Is the replacement complete?

--

Go to Step 34

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1. Make sure any components removed during diagnosis are installed in place and that all connectors are connected.
2. Repeat the system check. Refer to Radio/Audio System Check .

Is the system check complete?

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System OK

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