GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Isuzu 🢒 1999 🢒 Isuzu MD Steel Tilt (F Model) 🢒 Body and Accessories 🢒 Entertainment 🢒 Speakers Inoperative - One or More

Speakers Inoperative - One or More Left Front Speaker

Left Front Speaker

Step

Action

Value(s)

Yes

No

1
  1. Disconnect the connector at the left front radio speaker.
  2. Connect a Digital Multimeter (DMM) between left front radio speaker terminal A and terminal B.
  3. Measure the resistance.

Does the resistance measure within the specified range?

4-15 ohms

Go to Step 2

Go to Speaker Replacement .

2
  1. Ensure that the speaker and connector terminals are not damaged or corroded.
  2. Reconnect the connector at the left front radio speaker.
  3. Place the ignition switch in the ACCY position.
  4. Turn the radio on.

Does the speaker operate properly with clear sound?

--

Go to Step 3

Go to Step 4

3

Repair the left front radio speaker connector as necessary.

Is the speaker malfunction resolved?

--

System OK

Go to Step 4

4
  1. Disconnect the connector at the left front radio speaker.
  2. Disconnect the connector at the radio.
  3. Verify that no voltage is present on CKT 357 (BLU).
  4. Connect a DMM between radio connector terminal 12 for CKT 357 (BLU) and ground.

Does the DMM indicate continuity?

--

Go to Step 5

Go to Step 6

5
  1. Locate and repair the short to ground on CKT 357 (BLU) between the radio and the left front radio speaker.
  2. Test the speaker performance.

Has the short circuit damaged the radio speaker's output?

--

Go to Radio Replacement

Go to Step 6

6
  1. Ensure that no voltage is present on CKT 358 (BLU/WHT).
  2. Connect a DMM between radio connector terminal 5 for CKT 358 (BLU/WHT) and ground.

Does the DMM indicate continuity?

--

Go to Step 7

Go to Step 8

7
  1. Locate and repair the short to ground on CKT 358 (BLU/WHT) between the radio and the left front radio speaker.
  2. Test the speaker performance.

Has the short circuit damaged the radio speaker's output?

--

Go to Radio Replacement

Go to Step 8

8
  1. Reconnect the connector at the left front radio speaker.
  2. Connect an ohmmeter between radio connector terminal 5 for CKT 358 (BLU/WHT) and terminal 12 for CKT 357 (BLU).
  3. Measure the resistance.

Does the resistance measure within the specified range?

4-15 ohms

Go to Radio Replacement

Go to Step 9

9

Locate and repair the following conditions in CKT 357 (BLU) or CKT 358 (BLU/WHT) between the radio and the left front radio speaker:

  1. The open circuit
  2. The pinched lead wire
  3. The high contact resistance

Is the speaker malfunction resolved?

--

System OK

--

Speakers Inoperative - One or More Right Front Speaker

Right Front Speaker

Step

Action

Value(s)

Yes

No

1
  1. Disconnect the connector at the right front radio speaker.
  2. Connect a Digital Multimeter (DMM) between right front radio speaker terminal A and terminal B.
  3. Measure the resistance.

Does the resistance measure within the specified range?

4-15 ohms

Go to Step 2

Go to Speaker Replacement

2
  1. Ensure that the speaker and connector terminals are not damaged or corroded.
  2. Reconnect the connector at the right front radio speaker.
  3. Place the ignition switch in the ACCY position.
  4. Turn the radio on.

Does the speaker operate properly with clear sound?

--

Go to Step 3

Go to Step 4

3

Repair the right front radio speaker connector as necessary.

Is the speaker malfunction resolved?

--

System OK

Go to Step 4

4
  1. Disconnect the connector at the right front radio speaker.
  2. Disconnect the connector at the radio.
  3. Verify that no voltage is present on CKT 155 (GRN) and CKT 355 (GRN).
  4. Connect a DMM between radio connector terminal 13 for CKT 355 (GRN) and ground.

Does the DMM indicate continuity?

--

Go to Step 5

Go to Step 6

5
  1. Locate and repair the short to ground on CKT 155 (GRN) and CKT 355 (GRN) between the radio and the right front radio speaker.
  2. Test the speaker performance.

Has the short circuit damaged the radio speaker's output?

--

Go to Radio Replacement

Go to Step 6

6
  1. Ensure that no voltage is present on CKT 156 (GRN/WHT) and CKT 356 (GRN/WHT).
  2. Connect a DMM between radio connector terminal 6 for CKT 156 (GRN/WHT) and CKT 356 (GRN/WHT) and ground.

Does the DMM indicate continuity?

--

Go to Step 7

Go to Step 8

7
  1. Locate and repair the short to ground on CKT 156 (GRN/WHT) and CKT 356 (GRN/WHT) between the radio and the right front radio speaker.
  2. Test the speaker performance.

Has the short circuit damaged the radio speaker's output?

--

Go to Radio Replacement

Go to Step 8

8
  1. Reconnect the connector at the right front radio speaker.
  2. Connect a DMM between radio connector terminal 13 for CKT 355 (GRN/WHT) and terminal 6 for CKT 356 (GRN).
  3. Measure the resistance.

Does the resistance measure within the specified range?

4-15 ohms

Go to Radio Replacement

Go to Step 9

9

Locate and repair the following conditions in CKT 355 (GRN) or CKT 356 (GRN/WHT) between the radio and the right front radio speaker:

  1. The open circuit
  2. The pinched lead wire
  3. The high contact resistance

Is the speaker malfunction resolved?

--

System OK

--