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?

Varies between 0.1V and 3V AC

Go to Step 3

Go to Step 2

Check for an open, short to B+ or 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?

--

Go to Step 7

Go to Step 8

1. Make sure the radio is playing 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?

Varies between 0.1V and 10V AC

Go to Step 4

Go to Step 9

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?

--

Go to Step 5

Go to Step 6

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

Is there a short to B+ or short to ground in any of the inoperative speaker circuits?

--

Go to Step 11

Go to Step 10

1. Disconnect the inoperative speaker.
2. Using a DMM, measure the resistance between the speakers terminals. Compare measured value with the following:

Is the resistance measured within the specified values?

--

Go to Step 12

Go to Step 10

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

Is the repair complete?

--

Go to Radio/Audio System Check

--

Replace the radio. Refer to Radio Replacement for service procedure.

Is the repair complete?

--

Go to Radio/Audio System Check

--

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

Is the repair complete?

--

Go to Radio/Audio System Check

--

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

Is the repair complete?

--

Go to Radio/Audio System Check

--

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

Is the repair complete?

--

Go to Radio/Audio System Check

--

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

Is the repair complete?

--

Go to Radio/Audio System Check

--

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

Is the test light on?

--

Go to Step 2

Go to Step 6

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

Is the test light on?

--

Go to Step 3

Go to Step 7

1. Disconnect the low frequency audio amplifier connector C2.
2. Turn the ignition switch on.
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+ (10-14V)

Go to Step 4

Go to Step 5

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 at mid-range.
4. Observe the voltage measured using the DMM.

Is the measured voltage within the specified range?

Varies between 0.1V and 3V AC

Go to Step 10

Go to Step 11

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 within the specified range?

Less than 2ohms

Go to Step 8

Go to Step 9

Repair poor connection or open in circuit 640.

Is the repair complete?

--

Go to Radio/Audio System Check

--

Repair poor connection or open in circuit 351.

Is the repair complete?

--

Go to Radio/Audio System Check

--

Replace the radio. Refer to Radio Replacement for service procedure.

Is the repair complete?

--

Go to Radio/Audio System Check

--

Repair poor connection or open in circuit 314.

Is the repair complete?

--

Go to Radio/Audio System Check

--

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

Is the repair complete?

--

Go to Radio/Audio System Check

--

1. Check for a poor connection or 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 for service procedure.

Is the repair complete?

--

Go to Radio/Audio System Check

--