Has the Radio Audio System Diagnostic System Check been performed?

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Go to Step 2

Go to Diagnostic System Check - Radio/Audio System

Are both subwoofers inoperative?

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Go to Step 3

Go to Step 10

Inspect the Bose® fuse #28 for an open.

Is the fuse open?

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Go to Step 4

Go to Step 5

Repair the short to ground in the subwoofer feed circuit 360.

Is the repair complete?

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Go to Step 24

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1. Remove the Bose® mini relay #43.
2. Connect a fused jumper wire across the relay switched circuits (CKT 2040 to CKT 360) in the instrument panel electrical center.
3. Turn the ignition switch and the radio ON.

Do the subwoofers operate?

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Go to Step 6

Go to Step 10

1. With the Bose® mini relay #43 removed, ignition switch and radio ON.
2. Using a test light test for voltage at the relay control circuit 145 terminal in the instrument panel electrical center.

Does the test light illuminate?

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Go to Step 7

Go to Step 8

Test and repair the relay coil ground circuit 150 for an open or high resistance.

Did you find and correct the condition?

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Go to Step 24

Go to Step 9

Repair the relay control circuit 145 for an open or high resistance.

Did you complete the repair?

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Go to Step 24

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Replace the Bose® mini relay #43.

Is the replacement complete?

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Go to Step 24

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1. Reinstall the Bose® mini relay #43.
2. Turn the ignition switch and radio ON.
3. Using a test light test for voltage at the inoperative subwoofer feed circuits 360 (subwoofer connector terminals A and H to ground).

Does the test light illuminate?

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Go to Step 11

Go to Step 12

Test and repair the subwoofer ground circuits 351 for an open or high resistance.

Did you find and correct the condition?

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Go to Step 24

Go to Step 13

Repair the open or high resistance in circuit 360.

Is the repair complete?

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Go to Step 24

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1. With the inoperative subwoofer connector disconnected, connect a DMM between the subwoofer signal and return circuits (connector terminals C to F).
2. Set the DMM to the low AC voltage scale.
3. Turn the ignition and radio ON.
4. Set the radio volume, fade, balance, and bass to midrange settings.

Does the DMM indicate a varying AC voltage of approximately 0.1 to 2 volts?

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Go to Step 14

Go to Step 15

Replace the inoperative subwoofer. Refer to Radio Front Speaker Replacement .

Is the replacement complete?

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Go to Step 24

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1. Leave the connector of the inoperative subwoofer disconnected.
2. Disconnect the Bose® Signal Processor connector.
3. Test and repair the subwoofer signal circuits (1725 LH or 1726 RH) and return circuits (511 LH or 514 RH) for the following conditions:

•	Open or high resistance

•	Continuity between the signal and return circuits (shorted together)

•	Continuity from the signal or return circuit to the shield circuit 514

Did you find and correct the condition?

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Go to Step 24

Go to Step 16

1. Leave the Bose® Signal Processor connector disconnected.
2. Connect a DMM between each of the radio output signal circuits (front and rear) to the side of the inoperative subwoofer and the common ground circuit 1960.
3. Set the DMM to the low AC voltage scale.
4. Turn the ignition and radio ON.
5. Set the radio volume, fade, balance, and bass to midrange settings.

Does the DMM indicate a varying AC voltage of approximately 0.1 to 2 volts on the front and rear signal circuits to the side of the inoperative subwoofer?

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Go to Step 18

Go to Step 17

1. Leave the Bose® Signal Processor connector disconnected.
2. Disconnect the radio connector C3.
3. Test and repair the radio output signal circuits and common ground circuit for the following conditions:

•	open or high resistance.

•	continuity between the circuits (shorted together).

•	continuity from the signals or common circuit to the shield circuit 2012.

Did you find and correct the condition?

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Go to Step 24

Go to Step 22

Inspect the RDO/ANT fuse #24 for an open.

Is the fuse open?

--

Go to Step 19

Go to Step 20

Repair the short to ground in circuit 40.

Is the repair complete?

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Go to Step 24

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Test and repair the Bose® Signal Processor feed circuit 145 for an open or high resistance.

Did you find and correct the condition?

--

Go to Step 24

Go to Step 21

Test and repair the Bose® Signal Processor ground circuit 1051 for an open or high resistance.

Did you find and correct the condition?

--

Go to Step 24

Go to Step 23

Replace the radio. Refer to Radio Replacement .

Is the repair complete?

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Go to Step 24

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Replace the Bose® Signal Processor. Refer to Bose Module Replacement .

Is the repair complete?

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Go to Step 24

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1. Clear any DTCs which may have set.
2. Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Diagnostic System Check - Radio/Audio System

Has the Radio Audio System Diagnostic System Check been performed?

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Go to Step 2

Go to Diagnostic System Check - Radio/Audio System

1. Disconnect the inoperative speaker connector.
2. Connect a DMM between the speaker signal and return circuits.
3. Set the DMM to the low AC voltage scale.
4. Turn the ignition and radio ON.
5. Set the radio volume, fade, and balance to midrange settings.

Does the DMM indicate a varying AC voltage of approximately 0.1 to 2 volts?

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Go to Step 3

Go to Step 4

Replace the inoperative speaker. Refer to the following procedures:

Is the replacement complete?

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Go to Step 13

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1. With the inoperative speaker connector disconnected.
2. Disconnect the radio connector (C1 front speaker inop) or (C2 rear speaker inop).
3. Test and repair the speaker signal circuits and return circuits for the following conditions:

•	Open or high resistance

•	Continuity between the signal and return circuits (shorted together)

•	Short to ground or voltage

Did you find and correct the condition?

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Go to Step 13

Go to Step 5

1. Reconnect the radio connector C1 or C2.
2. Disconnect the Bose® Signal Processor connector.
3. Connect a DMM between the inoperative speaker signal circuit and the common circuit 1960 at the Bose Signal Processor connector (radio input to the signal processor).
4. Set the DMM to the low AC voltage scale.
5. Turn the ignition and radio ON.
6. Set the radio volume, fade, and balance to midrange settings.

Does the DMM indicate a varying AC voltage of approximately 0.1 to 2 volts?

--

Go to Step 7

Go to Step 6

1. Leave the Bose® Signal Processor connector disconnected.
2. Disconnect the radio connector C4.
3. Test and repair the radio output signal circuits and common ground circuit for the following conditions:

•	Open or high resistance

•	Continuity between the circuits (shorted together)

•	Continuity from the signals or common circuit to the shield circuit 2012

Did you find and correct the condition?

--

Go to Step 13

Go to Step 11

1. Reconnect the Bose® Signal Processor connector.
2. Disconnect the radio connector C3.
3. Connect the positive lead of a DMM to the inoperative speaker signal circuit at the radio connector C3.
4. Carefully backprobe the radio connector C4 terminal 7 with the negative lead.
5. Set the DMM to the low AC voltage scale.
6. Turn the ignition and radio ON.
7. Set the radio volume, fade, and balance to midrange settings.

Does the DMM indicate a varying AC voltage of approximately 0.1 to 2 volts?

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Go to Step 11

Go to Step 8

1. Leave the radio connector C3 disconnected.
2. Disconnect the radio connector C4.
3. Disconnect the Bose® Signal Processor connector.
4. Test and repair the Bose Signal Processor output signal circuits and common ground circuit 1860 for the following conditions:

•	Open or high resistance

•	Continuity between the circuits (shorted together)

•	Continuity from the signals or common circuit to the shield circuit 2011

Did you find and correct the condition?

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Go to Step 13

Go to Step 9

Test and repair the Bose® Signal Processor feed circuit 145 for an open or high resistance.

Did you find and correct the condition?

--

Go to Step 13

Go to Step 10

Test and repair the Bose® Signal Processor ground circuit 1051 for an open or high resistance.

Did you find and correct the condition?

--

Go to Step 13

Go to Step 12

Replace the radio. Refer to Radio Replacement .

Is the repair complete?

--

Go to Step 13

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Replace the Bose® Signal Processor. Refer to Bose Module Replacement .

Is the repair complete?

--

Go to Step 13

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1. Clear any DTCs which may have set.
2. Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Diagnostic System Check - Radio/Audio System

Has the Radio Audio System Diagnostic System Check been performed?

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Go to Step 2

Go to Diagnostic System Check - Radio/Audio System

1. Disconnect the inoperative speaker connector.
2. Connect a DMM between the speaker signal and return circuits.
3. Set the DMM to the low AC voltage scale.
4. Turn the ignition and radio ON.
5. Set the radio volume, fade, and balance to midrange settings.

Does the DMM indicate a varying AC voltage of approximately 0.1 to 2 volts?

--

Go to Step 3

Go to Step 4

Replace the inoperative speaker. Refer to the following procedures:

Is the replacement complete?

--

Go to Step 6

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1. Leave the connector of the inoperative speaker disconnected.
2. Disconnect the radio connector (C1 front speaker inop) or (C2 rear speaker inop).
3. Test and repair the speaker signal circuits and return circuits for the following conditions:

•	Open or high resistance

•	Continuity between the signal and return circuits (shorted together)

•	Short to ground or voltage

Did you find and correct the condition?

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Go to Step 6

Go to Step 5

Replace the radio. Refer to Radio Replacement .

Is the repair complete?

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Go to Step 6

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1. Clear any DTCs which may have set.
2. Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Diagnostic System Check - Radio/Audio System