1

Did you review the symptom list?

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Go to Step 2

Go to Symptoms

1. Turn the ignition switch on.
2. Turn the radio on.
3. Set the radio volume at mid range.
4. Connect a DMM (set to measure AC voltage) by backprobing between the low frequency audio amplifier connector C2 terminal B9 and the following terminal based on the inoperative speaker:

•	Left Front Speaker: B5

•	Right Front Speaker: B6

•	Left Rear Speaker: B7

•	Right Rear Speaker: B8

Is the voltage measured within the specified range?

0.1-3.0 V AC

Go to Step 4

Go to Step 3

Check for an open, a short to B+ or a short to ground in this circuit, based on the inoperative speaker:

Is there poor connection, short to B+ or short to ground in the circuit?

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Go to Step 8

Go to Step 9

1. Play the radio with the volume at mid range.
2. Connect a DMM (set to measure AC voltage) by backprobing between these terminals at the low frequency audio amplifier, based on the inoperative speaker:

•	Left Front Speaker: C2/A11 and C2/A12

•	Right Front Speaker: C2/A7 and C2/A8

•	Left Rear Speaker: C1/B and C1/G

•	Right Rear Speaker: C2/A9 and C2/A10

•	Left Rear Speaker (Sub-Woofer): C1/C and C1/F

•	Right Rear Speaker (Sub-Woofer): C1/D and C1/E.

Is the voltage measured within the specified range?

0.1-10.0 V AC

Go to Step 5

Go to Step 10

1. Turn the radio off.
2. Turn the ignition switch off.
3. Disconnect the low frequency audio amplifier connectors C1 and C2.
4. Using a DMM, verify the resistance at low frequency audio amplifier harness connector terminals, based on the inoperative speaker:

•	Left Front Speaker: C2/A11 and C2/A12: 2.6ohms

•	Right Front Speaker: C2/A7 and C2/A8: 2.6ohms

•	Left Rear Speaker: C1/B and C1/G: 4ohms

•	Right Rear Speaker: C2/A9 and C2/A10: 4ohms

•	Left Rear Speaker (Sub-Woofer): C1/C and C1/F: 2.5ohms

•	Right Rear Speaker (Sub-Woofer): C1/D and C1/E: 2.5ohms

Is the resistance measured same as the specified values shown above?

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Go to Step 6

Go to Step 7

Test for a short to B+ or short to ground in these circuits, based on the inoperative speaker:

Did you find a short to B+ or short to ground in any of the inoperative speaker circuits?

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Go to Step 12

Go to Step 11

1. Disconnect the inoperative speaker.
2. Using a DMM, measure the resistance between the speakers terminals:

Is the resistance measured the same as the specified values shown above?

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Go to Step 13

Go to Step 11

Repair the faulty circuit between the radio and the low frequency audio amplifier.

Is the repair complete?

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Go to Step 14

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Replace the radio. Refer to Radio Replacement ,

Is the repair complete?

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Go to Step 14

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Replace the low frequency audio amplifier. Refer to Radio Speaker Amplifier Replacement .

Is the repair complete?

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Go to Step 14

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Replace the inoperative speaker. Refer to Radio Front Speaker Replacement or Radio Front Side Door Speaker Replacement or Radio Rear Speaker Replacement .

Is the repair complete?

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Go to Step 14

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Repair a faulty circuit between the low frequency audio amplifier and the inoperative speaker.

Is the repair complete?

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Go to Step 14

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Repair a poor connection or an open between the low frequency audio amplifier and the inoperative speaker.

Is the repair complete?

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Go to Step 14

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Operate the system in order to verify the repair.

Did you correct the condition?

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Go to Symptoms

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1

Did you review the symptom list?

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Go to Step 2

Go to Symptoms

1. Turn off the ignition switch.
2. Disconnect the low frequency audio amplifier connector C1.
3. Using a test lamp and a J 35616 , connect between the low frequency audio amplifier harness connector C1 terminal H and ground.

Did the test lamp light?

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Go to Step 3

Go to Step 7

Using a test lamp and a J 35616 , connect between the low frequency audio amplifier harness connector C1 terminal A and terminal H.

Did the test lamp light?

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Go to Step 4

Go to Step 8

1. Disconnect the low frequency audio amplifier connector C2.
2. Turn on the ignition switch.
3. Using a DMM and a J 35616 , measure the voltage between the low frequency audio amplifier harness connector C2 terminal A1 and ground.

Is the voltage measured within the specified range?

B+ (10-14 V)

Go to Step 5

Go to Step 6

1. Reconnect the low frequency audio amplifier.
2. Using a DMM set to measure A/C voltage, connect by backprobing between the low frequency audio amplifier harness connector C2 terminal B5 and terminal B9.
3. Turn the radio volume to mid-range.
4. Observe the voltage measured using the DMM.

Is the measured voltage within the specified range?

0.1-3.0 V AC

Go to Step 11

Go to Step 12

1. Turn the ignition switch off.
2. Using a DMM and a J 35616 , measure the resistance between the radio harness connector terminal E3 and the low frequency audio amplifier harness connector C1 terminal A1.

Is the resistance measured less the specified value?

2ohms

Go to Step 9

Go to Step 10

Repair a poor connection or an open in circuit 640.

Is the repair complete?

--

Go to Step 13

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Repair a poor connection or an open in circuit 351.

Is the repair complete?

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Go to Step 13

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Replace the radio. Refer to Radio Replacement .

Is the repair complete?

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Go to Step 13

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Repair a poor connection or an open in circuit 314.

Is the repair complete?

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Go to Step 13

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Replace the low frequency audio amplifier. Refer to Radio Speaker Amplifier Replacement .

Is the repair complete?

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Go to Step 13

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1. Test for a poor connection or an open between the radio and the low frequency audio amplifier circuits 314, 511, 512, 546, 599, and 1946; repair as needed.
2. If these circuit are OK, then replace the radio. Refer to Radio Replacement .

Is the repair complete?

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Go to Step 13

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Operate the system in order to verify the repair.

Did you correct the condition?

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Go to Symptoms

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