GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the radio/audio system check?

--

Go to Step 2

Go to Radio/Audio System Check

2

  1. Disconnect the suspect speaker.
  2. Connect a 1.5 volt battery across the cavities of the suspect speaker.

Is there a pop noise from the speaker?

--

Go to Step 4

Go to Step 3

3

Replace the speaker.

Refer to Rear Pillar Speaker Replacement Radio Rear Side Door Speaker Replacement .

Is the repair complete?

--

Go to Radio/Audio System Check

--

4

Check if the vehicle is equipped with rear radio control.

Is the vehicle equipped with rear radio control?

--

Go to Step 20

Go to Step 5

5

Check if the vehicle is equipped with a sub-woofer amplifier.

Is the vehicle equipped with a sub-woofer amplifier?

--

Go to Step 9

Go to Step 6

6

  1. Turn the ignition switch to the ACC or the RUN position.
  2. Turn the radio ON.
  3. Tune the radio to a strong signal.
  4. Using the balance control on the radio, balance the radio signal between the left and the right rear speakers.

Is the left and right rear speakers inoperative or distorted?

--

Go to Step 19

Go to Step 7

7

Check for an open or a short in the following circuits between the radio and the rear speakers:

    • CKT 116 (YEL)
    • CKT 199 (BRN)

For the left side speakers.

    • CKT 46 (DK BLU)
    • CKT 115 (LT BLU)

For the right side speakers.

Did you find a short or open?

--

Go to Step 8

Go to Step 19

8

Repair the open or short in the following circuits between the radio, the rear speakers and the sub-woofer amplifier (if equipped):

    • CKT 116 (YEL)
    • CKT 199 (BRN)

For the left side speakers.

    • CKT 46 (DK BLU)
    • CKT 115 (LT BLU)

For the right side speakers.

Is the repair complete?

--

Go to Radio/Audio System Check

--

9

  1. Disconnect the sub-woofer amplifier.
  2. Turn the ignition switch to the ACC or the RUN position.
  3. Turn the radio ON.
  4. Tune the radio to a strong signal.

Are both the rear speakers inoperative or distorted?

--

Go to Step 19

Go to Step 10

10

Using the balance control on the radio, balance the radio signal between the left and right rear speakers.

Is the left or right rear speaker inoperative or distorted?

--

Go to Step 7

Go to Step 11

11

Connect a test lamp J 35616-200 from the sub-woofer amplifier connector CKT 840 (ORN) to ground.

Does the test lamp light?

--

Go to Step 12

Go to Step 13

12

Connect a test lamp J 35616-200 from the sub-woofer connector CKT 840 (ORN) to CKT 1350 (BLK).

Does the test lamp light?

--

Go to Step 15

Go to Step 14

13

Repair the open in CKT 840 (ORN) between sub-woofer amplifier connector and S322.

Is the repair complete?

--

Go to Radio/Audio System Check

--

14

Repair the open in CKT 1350 (BLK) between sub-woofer amplifier connector and S319.

Is the repair complete?

--

Go to Radio/Audio System Check

--

15

Using a DMM J 39200 check for voltage from CKT 116 (YEL) B3 to CKT 199 (BRN) A3 for the left side speakers, and CKT 46 (DK BLU) A4 to CKT 115 (LT BLU) B4 for the right side speakers.

Is voltage present?

--

Go to Step 16

Go to Step 8

16

Check for an open or a short in the following circuits between the sub-woofer speaker and the sub-woofer amplifier:

    • CKT 1794 (LT GRN/BLK)
    • CKT 346 (DK BLU/BLK)

For the left side speakers.

    • CKT 315 (LT BLU/BLK)
    • CKT 1795 (DK GRN)

For the right side speakers.

Did you find a short or open?

--

Go to Step 17

Go to Step 18

17

Repair the open or short in the following circuits between the sub-woofer speaker and the sub-woofer amplifier:

    • CKT 1794 (LT GRN/BLK)
    • CKT 346 (DK BLU/BLK)

For the left side speakers.

    • CKT 315 (LT BLU/BLK)
    • CKT 1795 (DK GRN)

For the right side speakers.

Is the repair complete?

--

Go to Radio/Audio System Check

--

18

Service the sub-woofer amplifier. Refer to Radio Speaker Amplifier Replacement .

Is the repair complete?

--

Go to Radio/Audio System Check

--

19

Service the radio. Refer to Radio Replacement

Is the repair complete?

--

Go to Radio/Audio System Check

--

20

  1. Turn the ign switch to ACCY or RUN position.
  2. Using a test lamp J 35616-200 , backprobe CKT 43 (YEL) terminal A8 at the rear radio control module to ground.

Does the test lamp light?

--

Go to Step 22

Go to Step 21

21

Repair the open in CKT 43 (YEL) between the rear radio control module and S246.

Is the repair complete?

--

Go to Radio/Audio System Check

--

22

Connect a test lamp J 35616-200 from rear radio control module CKT 43 (YEL) to CKT 550 (BLK).

Does the test lamp light?

--

Go to Step 24

Go to Step 23

23

Repair the open in CKT 550 (BLK) between the rear radio control module and S315.

Is the repair complete?

--

Go to Radio/Audio System Check

--

24

  1. Disconnect the radio C2 connector.
  2. Using a DMM J 39200 test for voltage at CKT 1011 (LT GRN) cavity 13 connector C2.
  3. Test for voltage with the rear radio control module power button depressed and held.

Is voltage within specified value?

3.2 - 3.8 V

Go to Step 26

Go to Step 25

25

  1. Disconnect the rear radio control module.
  2. Using a DMM J 39200 test CKT 1011 (LT GRN) for continunity.

Is there continunity?

--

Go to Step 29

Go to Step 27

26

  1. Connect a fused jumper from CKT 1011 (LT GRN) to the radio cavity 13 .
  2. Connect a DMM J 39200 from cavity 12 at the radio to ground.

Is voltage present?

--

Go to Step 28

Go to Step 19

27

Repair the open in CKT 1011 (LT GRN) between the rear radio control module and the radio.

Is the repair complete?

--

Go to Radio/Audio System Check

--

28

  1. Disconnect the rear radio control module.
  2. Using a DMM J 39200 test CKT 314 (PNK) for continunity.

Is there continunity?

--

Go to Step 31

Go to Step 30

29

Service the rear radio control module. Refer to Rear Seat Audio Control Replacement .

Is repair complere?

--

Go to Radio/Audio System Check

--

30

Repair the open in CKT 314 (PNK) between the rear radio control module and the radio.

Is the repair complete?

--

Go to Radio/Audio System Check

--

31

  1. Reconnect the radio and the rear radio control module.
  2. Disconnect the sub-woofer amplifier.
  3. Turn the ignition switch to the ACC or the RUN position.

  4. Turn the radio ON.
  5. Tune the radio to a strong signal.

Are both the rear speakers inoperative?

--

Go to Step 19

Go to Step 32

32

Using the balance control on the radio, balance the radio signal between the left and right rear speakers.

Is the left or right rear speaker inoperative or distorted?

--

Go to Step 33

Go to Step 35

33

Check for an open or a short in the following circuits between the radio and the rear speakers:

    • CKT 1999 (BRN/WHT)
    • CKT 599 (BLK)
    • CKT 199 (BRN)
    • CKT 116 (YEL)

For the left side speakers.

    • CKT 1946 (BLK)
    • CKT 546 (BRN/WHT)
    • CKT 46 (DK BLU)
    • CKT 115 (LT BLU)

For the right side speakers.

Did you find a short or open?

--

Go to Step 34

Go to Step 40

34

Repair the open or short in the following circuits between the radio, the rear speakers and the sub-woofer amplifier (if equipped):

    • CKT 1999 (BRN/WHT)
    • CKT 599 (BLK)
    • CKT 199 (BRN)
    • CKT 116 (YEL)

For the left side speakers.

    • CKT 1946 (BLK)
    • CKT 546 (BRN/WHT)
    • CKT 46 (DK BLU)
    • CKT 115 (LT BLU)

For the right side speakers.

Is the repair complete?

--

Go to Radio/Audio System Check

--

35

  1. Disconnect the sub-woofer amplifier.
  2. Connect a test lamp J 35616-200 from the sub-woofer amplifier connector CKT 840 (ORN) to ground.

Does the test lamp light?

--

Go to Step 36

Go to Step 37

36

Connect a test lamp J 35616-200 from the sub-woofer connector CKT 840 (ORN) to CKT 1350 (BLK).

Does the test lamp light?

--

Go to Step 39

Go to Step 38

37

Repair the open in CKT 840 (ORN) between sub-woofer amplifier connector and S322.

Is the repair complete?

--

Go to Radio/Audio System Check

--

38

Repair the open in CKT 1350 (BLK) between sub-woofer amplifier connector and S319.

Is the repair complete?

--

Go to Radio/Audio System Check

--

39

Using a DMM J 39200 check for voltage on the following circuits:

    • CKT 1999 (BRN/BLK) B3 toCKT 599 (BLK) A3 for the left side speakers.
    • CKT 1946 (BLK) B4
        CKT 546 (DK BLU) A4 for the right side speakers.

Is voltage present?

--

Go to Step 16

Go to Step 41

40

Using a DMM J 39200 test for continunity between the following cavaties:

    • Cavity A4 to B4
    • Cavity A3 to B3
    • Cavity A1 to B1
    • Cavity A2 to B2

Is there continunity?

--

Go to Step 19

Go to Step 29

41

Repair the open or short in the following circuits between the radio, the rear speakers and the sub-woofer amplifier (if equipped):

    • CKT 1999 (BRN/WHT)
    • CKT 599 (BLK)

For the left side speakers.

    • CKT 1946 (BLK)
    • CKT 546 (BRN/WHT)

For the right side speakers.

Is the repair complete?

--

Go to Radio/Audio System Check

--