GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2001 🢒 Eldorado 🢒 Body and Accessories 🢒 Entertainment 🢒 Speakers Inoperative - One or More

Speakers Inoperative - One or More w/UQ4

Step

Action

Yes

No

Schematic Reference: Radio/Audio System Schematics

1

Did you perform the Radio/Audio System Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Radio/Audio System

2
  1. Turn ON the ignition, with the engine OFF.
  2. Turn ON the radio.

Are all of the speakers inoperative?

Go to Step 10

Go to Step 3

3

Do all speakers on one side of the vehicle malfunction, but the speakers on the other side operate properly?

Go to Step 7

Go to Step 4

4
  1. Use the J 39916-A in order to isolate the inoperative speaker if necessary.
  2. Set the fade and the balance to the inoperative speaker.
  3. Does the speaker operate properly?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 5

5
  1. Turn OFF the ignition.
  2. Disconnect the inoperative speaker.
  3. Turn ON the ignition, with the engine OFF.
  4. Turn ON the radio.
  5. Probe the battery positive voltage circuit of the speaker with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

Go to Step 6

Go to Step 18

6

Connect a test lamp between the battery positive voltage circuit of the speaker and the ground circuit of the speaker.

Does the test lamp illuminate?

Go to Step 16

Go to Step 19

7
  1. Turn OFF the ignition.
  2. Disconnect the inoperative rear speaker.
  3. Turn ON the ignition, with the engine OFF.
  4. Turn ON the radio.
  5. Probe the battery positive voltage circuit of the speaker with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

Go to Step 8

Go to Step 9

8

Test the low level audio signal (-) circuit of the inoperative channel between the radio and the radio interface module for a short. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 24

Go to Step 14

9
  1. Turn OFF the ignition.
  2. Disconnect the appropriate Bose relay.
  3. Turn ON the ignition, with the engine OFF.
  4. Turn ON the radio.
  5. Probe the battery positive voltage circuit of the Bose relay with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

Go to Step 17

Go to Step 18

10
  1. Turn OFF the ignition.
  2. Remove one of the Bose relays.
  3. Turn ON the ignition, with the engine OFF.
  4. Turn ON the radio.
  5. Probe the battery positive voltage circuit of the Bose relay with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

Go to Step 11

Go to Step 18

11

Probe the speaker relay control circuit of the Bose relay with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

Go to Step 12

Go to Step 13

12

Connect a test lamp between the speaker relay control circuit of the Bose relay and the ground circuit of the Bose relay.

Does the test lamp illuminate?

Go to Step 15

Go to Step 19

13

Test the speaker relay control circuit for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 24

Go to Step 15

14

Inspect for poor connections at the harness connector of the radio. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 24

Go to Step 20

15

Inspect for poor connections at the harness connector of the radio interface module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 24

Go to Step 21

16

Inspect for poor connections at the speaker. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 24

Go to Step 22

17

Inspect for poor connections at the appropriate Bose relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 24

Go to Step 23

18

Repair the battery positive voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 24

--

19

Repair the ground circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 24

--

20

Replace the radio. Refer to Radio Replacement .

Did you complete the repair?

Go to Step 24

--

21

Replace the radio interface module. Refer to Radio Speaker Amplifier Replacement .

Did you complete the repair?

Go to Step 24

--

22

Replace the speaker. Refer to:

Did you complete the replacement?

Go to Step 24

--

23

Replace the Bose relay.

Did you complete the repair?

Go to Step 24

--

24

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2

Speakers Inoperative - One or More w/UW6

Step

Action

Yes

No

Schematic Reference: Radio/Audio System Schematics

1

Did you review the Radio/Audio System Description and Operation and perform the necessary inspections?

Go to Step 2

Go to Symptoms - Entertainment

2
  1. Turn ON the ignition, with the engine OFF.
  2. Turn ON the radio.

Are all of the speakers inoperative?

Go to Step 6

Go to Step 3

3
  1. Use the J 39916-A in order to isolate the inoperative speaker if necessary.
  2. Set the fade and the balance to the inoperative speaker.

Does the speaker operate properly?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 4

4

Measure the A/C voltage from the speaker output (+) at the inoperative speaker to the speaker output (-) at the inoperative speaker.

Is A/C voltage measured?

Go to Step 8

Go to Step 5

5

Test the speaker output circuits to the inoperative speaker for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 11

Go to Step 7

6

Test all speaker output circuits from the radio for a short. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 11

Go to Step 7

7

Inspect for poor connections at the harness connector of the radio. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 11

Go to Step 9

8

Inspect for poor connections at the speaker. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 11

Go to Step 10

9

Replace the radio. Refer to Radio Replacement .

Did you complete the replacement?

Go to Step 11

--

10

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

Did you complete the replacement?

Go to Step 11

--

11

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2