GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2000 🢒 Savana 🢒 Body and Accessories 🢒 Entertainment 🢒 Speakers Inoperative or Distorted - Rear

Step

Action

Value(s)

Yes

No

1

Did you review the radio/audio system description and operation and perform the necessary inspections?

--

Go to Step 2

Go to Symptoms

2

Verify the fault is present.

Does the system operate normally?

--

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

Go to Step 3

3

Do the left rear speaker(s) operate with good sound quality?

--

Go to Step 15

Go to Step 4

4
  1. Disconnect the C2 connector at the radio.
  2. Connect a J 39200 digital multimeter set on the voltage scale between the C2 connector, cavity 20 for CKT 199 (BRN), and ground.
  3. Place the ignition switch in the RUN position.

Is voltage present?

--

Go to Step 26

Go to Step 5

5

Connect a J 39200 digital multimeter set on the voltage scale between the radio C2 connector, cavity 19 for CKT 116 (YEL), and ground.

Is voltage present?

--

Go to Step 27

Go to Step 6

6
  1. Place the ignition switch in the OFF position.
  2. Connect a J 39200 digital multimeter set on the ohms scale between the radio C2 connector, cavity 20 for CKT 199 (BRN), and ground.

Is continuity present?

--

Go to Step 28

Go to Step 7

7

Connect a J 39200 digital multimeter set on the ohms scale between the radio C2 connector, cavity 19 for CKT 116 (YEL), and ground.

Is continuity present?

--

Go to Step 29

Go to Step 8

8

Connect a J 39200 digital multimeter set on the ohms scale between the radio C2 connector, cavity 20 for CKT 199 (BRN) and cavity 19 for CKT 116 (YEL).

Is the resistance within the specified range?

4-15 ohms

Go to Step 30

Go to Step 9

9
  1. Disconnect the left rear overhead radio speaker connector, and (if equipped) the left rear door radio speaker connector.
  2. Inspect the connector(s) for damage, corrosion or loose fit.

Is each connector in good condition?

--

Go to Step 10

Go to Step 31

10

Connect a J 39200 digital multimeter set on the ohms scale between the left rear overhead radio speaker connector, cavity A and the radio C2 connector, cavity 19 for CKT 116 (YEL).

Repeat step on left rear door speaker connector if equipped.

Is continuity present?

--

Go to Step 11

Go to Step 32

11

Connect a J 39200 digital multimeter set on the ohms scale between the left rear overhead radio speaker connector, cavity B and the radio C2 connector, cavity 20 for CKT 199 (BRN).

Repeat step on left rear door speaker connector if equipped.

Is continuity present?

--

Go to Step 12

Go to Step 33

12

Connect a J 39200 digital multimeter set on the ohms scale between the left rear overhead radio speaker pins A and B.

Repeat step on left rear door speaker if equipped.

Is the resistance within the specified range?

4-15 ohms

Go to Step 13

Go to Step 34

13
  1. Reconnect all connectors.
  2. Place ignition switch in the RUN position.
  3. Tune the radio to a strong, clear station.

Do the speaker(s) have good sound quality?

--

Go to Step 41

Go to Step 14

14

Substitute a known good speaker for the speaker with poor sound quality.

Does sound quality improve?

--

Go to Step 34

Go to Step 30

15
  1. Disconnect the C2 connector at the radio.
  2. Connect a J 39200 digital multimeter set on the voltage scale between the C2 connector, cavity 18 for CKT 46 (DK BLU), and ground.
  3. Place the ignition switch in the RUN position.

Is voltage present?

--

Go to Step 35

Go to Step 16

16

Connect a J 39200 digital multimeter set on the voltage scale between the radio C2 connector, cavity 17 for CKT 115 (LT BLU), and ground.

Is voltage present?

--

Go to Step 36

Go to Step 17

17
  1. Place the ignition switch in the OFF position.
  2. Connect a J 39200 digital multimeter set on the ohms scale between the radio C2 connector, cavity 18 for CKT 46 (DK BLU), and ground.

Is continuity present?

--

Go to Step 37

Go to Step 18

18

Connect a J 39200 digital multimeter set on the ohms scale between the radio C2 connector, cavity 17 for CKT 115 (LT BLU), and ground.

Is continuity present?

--

Go to Step 38

Go to Step 19

19

Connect a J 39200 digital multimeter set on the ohms scale between the radio C2 connector, cavity 18 and cavity 17.

Is the resistance within the specified range?

4-15 ohms

Go to Step 30

Go to Step 20

20
  1. Disconnect the right rear overhead radio speaker connector, and (if equipped) the right rear door radio speaker connector.
  2. Inspect the connector(s) for damage, corrosion or loose fit.

Is each connector in good condition?

--

Go to Step 21

Go to Step 31

21

Connect a J 39200 digital multimeter set on the ohms scale between the right rear overhead radio speaker connector, cavity A and the radio C2 connector, cavity 17 for CKT 115 (LT BLU).

Repeat this step on right rear door speaker connector if equipped.

Is continuity present?

--

Go to Step 22

Go to Step 39

22

Connect a J 39200 digital multimeter set on the ohms scale between the right rear overhead radio speaker connector, cavity B and the radio C2 connector, cavity 18 for CKT 46 (DK BLU).

Repeat this step on right rear door speaker connector if equipped.

Is continuity present?

--

Go to Step 23

Go to Step 40

23

Connect a J 39200 digital multimeter set on the ohms scale between the right rear overhead radio speaker pins A and B.

Repeat this step on right rear door speaker connector if equipped.

Is the resistance within the specified range?

4-15 ohms

Go to Step 24

Go to Step 34

24
  1. Reconnect all connectors.
  2. Place ignition switch in the RUN position.
  3. Tune the radio to a strong, clear station.

Do the speaker(s) have good sound quality?

--

Go to Step 41

Go to Step 25

25

Substitute a known good speaker for the speaker with poor sound quality.

Does sound quality improve?

--

Go to Step 34

Go to Step 30

26

Repair the short to voltage in CKT 199 (BRN). Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 41

--

27

Repair the short to voltage in CKT 116 (YEL). Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 41

--

28

Repair the short to ground in CKT 199 (BRN). Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 41

--

29

Repair the short to ground in CKT 116 (YEL). Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 41

--

30
  1. Remove and replace radio. Refer to Radio Replacement .
  2. Send faulty radio in for repair.

Is repair complete?

--

Go to Step 41

--

31

Repair damaged connector(s). Refer to Connector Repairs in Wiring Systems.

Is repair complete?

--

Go to Step 41

--

32

Repair the open in CKT 116 (YEL). Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 41

--

33

Repair the open in CKT 199 (BRN). Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 41

--

34

Replace the rear overhead speaker or rear door speaker. Refer to Radio Rear Speaker Replacement or Radio Rear Side Door Speaker Replacement .

Is the repair complete?

--

Go to Step 41

--

35

Repair the short to voltage in CKT 46 (DK BLU). Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 41

--

36

Repair the short to voltage in CKT 115 (LT BLU). Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 41

--

37

Repair the short to ground in CKT 46 (DK BLU). Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 41

--

38

Repair the short to ground in CKT 115 (LT BLU). Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 41

--

39

Repair the open in CKT 115 (LT BLU). Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 41

--

40

Repair the open in CKT 46 (DK BLU). Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 41

--

41

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 3