GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1999 🢒 GMC K Pickup - 4WD 🢒 Body and Accessories 🢒 Entertainment 🢒 Amplifier Inoperative

Amplifier Inoperative Luxury

Step

Action

Value(s)

Yes

No

1

Has the Radio/Audio System Check been performed?

--

Go to Step 2

Go to Radio/Audio System Check

2
  1. Place the ignition in the ACC or the RUN position.
  2. Connect a J 39200 DMM from cavity H CKT 640 of amplifier connector C2 to ground.

Does the voltage equal the specified value?

12 Volts

Go to Step 4

Go to Step 3

3

Repair the open in CKT 640 (ORN) from cavity C3 of the IP fuse block to cavity H connector C2 of the audio amplifier. Refer to Wiring Repairs .

Is the repair complete?

--

Go to Radio/Audio System Check

--

4

Connect a J 39200 DMM from connector C1 cavity B4 CKT 314 (PNK) to ground.

Does the voltage equal the specified value?

12 Volts

Go to Step 6

Go to Step 5

5

Repair open in CKT 314 (PNK) from cavity B4 connector C1 of the audio amplifier to cavity 12 connector C2 of radio. Refer to Wiring Repairs .

Is repair complete?

--

Go to Radio/Audio System Check

--

6

Connect a J 39200 DMM from connector C2 cavity A CKT 150 (BLK) of the audio amplifier to ground.

Is continuity present?

--

Go to Step 8

Go to Step 7

7

Repair open in CKT 150 (BLK) between cavity A connector C2 of audio amplifier to G202. Refer to Wiring Repairs .

Is repair complete?

--

Go to Radio/Audio System Check

--

8

Remove the power amplifier and send the power amplifier in for repair.

Is repair complete?

--

Go to Radio/Audio System Check

--

Amplifier Inoperative Base

Step

Action

Value(s)

Yes

No

1

Has the Radio/Audio System Check been performed?

--

Go to Step 2

Go to Radio/Audio System Check

2
  1. Turn the ignition to the OFF position.
  2. Disconnect the power amplifier connector.
  3. Turn the ignition to the ON position with the engine OFF.
  4. Turn the radio to the ON position.
  5. Measure the voltage from the amplifier connector cavity 13 to ground using a J 39200

Is there battery voltage.

--

Go to Step 12

Go to Step 3

3
  1. Turn the ignition OFF.
  2. Disconnect the amplifier relay connector.
  3. Connect a J 39200 between pin 5 and ground.

Is there battery voltage?

--

Go to Step 5

Go to Step 4

4

Locate and repair the open in CKT 640 (BRN) between the IP fuse block and the power amplifier relay connector. Refer to Wiring Repairs

Is the repair complete?

--

Go to Radio/Audio System Check

--

5

Connect a J 39200 from pin 3 of the Amplifier Relay Connector to pin 13 of the Amplifier Connector.

Is there continuity?

--

Go to Step 7

Go to Step 6

6

Locate and repair the open in CKT 360 (ORN) between the amplifier connector and the amplifier relay connector. Refer to Wiring Repairs

Is the repair complete?

--

Go to Radio/Audio System Check

--

7

Connect a J 39200 from pin 2 of the Amplifier Relay Connnector to ground.

Is there continuity?

--

Go to Step 8

Go to Step 10

8

Connect a J 39200 from pin 1 of the Amplifier Relay to pin 2 of the Amplifier Relay.

Is there continuity?

--

Go to Step 11

Go to Step 9

9

Replace the amplifier relay.

Is the repair complete?

--

Go to Radio/Audio System Check

--

10

Locate and repair the open in CKT 150 (BLK) between the amplifier relay and ground. Refer to Wiring Repairs

Is the repair complete?

--

Go to Radio/Audio System Check

--

11

Replace the amplifier. Refer to Radio Speaker Amplifier Replacement

Is the repair complete?

--

Go to Radio/Audio System Check

--

12

Connect a J 39200 from pin 14 of the Amplifier Connector to ground.

Is there continuity?

--

Go to Step 11

Go to Step 13

13

Locate and repair the open in CKT 150 (BLK) between the amplifier connector and G202. Refer to Wiring Repairs

Is the repair complete?

--

Go to Radio/Audio System Check

--