Inspection Procedure 8

INSPECTION PROCEDURE 8: No sound from tweeter or quarter speaker.

Speaker System Circuit (Tweeler And Quarter Speaker) Part 1:

Speaker System Circuit (Tweeler And Quarter Speaker) Part 2:

CIRCUIT OPERATION
The sound signals are sent from the radio and CD player with CD changer. After the signals are amplified and filtered, the sound signals are sent to the speaker.

TECHNICAL DESCRIPTION (COMMENT)
The cause is probably a faulty speaker circuit system.

TROUBLESHOOTING HINTS
- Malfunction of the tweeter.
- Malfunction of the quarter door speaker.
- Damaged wiring harness or connector.
- Malfunction of the radio and CD player with CD changer.

DIAGNOSIS

Required Special Tools:
- MB991223: Harness set
- MB992006: Extra Fine Probe

STEP 1. Check which speaker has no sound, on vehicles with audio amplifier.

Determine which speaker does not sound.

Q: Which speaker does not sound?

Tweeter (LH) : Go to Step 2.
Tweeter (RH) : Go to Step 5.
Quarter speaker (LH) : Go to Step 8.
Quarter speaker (RH) : Go to Step 11.

STEP 2. Check the tweeter (LH).

1. Remove the tweeter (LH).




2. Check that the tweeter (LH) generates noise when a five-volt voltage is applied on the tweeter (LH) terminal.

Q: Is the tweeter (LH) generating noise?

YES: Go to Step 3.

NO: Replace the tweeter (LH). The tweeter (LH) should sound.







STEP 3. Check tweeter (LH) connector C-131 and radio and CD player with CD changer connector C-117 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Are harness connectors C-131 and C-117 in good condition?

YES: Go to Step 4.

NO: Repair or replace the component(s). Refer to Harness Connector Inspection. The tweeter (LH) should sound.







STEP 4. Check the wiring harness between tweeter (LH) connector C-131 (terminals 1 and 2) and radio and CD player with CD changer connector C-117 (terminals 13 and 5).

Q: Is the wiring harness between tweeter (LH) connector C-131 (terminals 1 and 2) and audio amplifier connector C-117 (terminals 13 and 5) in good condition?

YES: Replace the radio and CD player with CD changer. The tweeter (LH) should sound.

NO: Repair the wiring harness. The tweeter (LH) should sound.

STEP 5. Check the tweeter (RH).

1. Remove the tweeter (RH).




2. Check that the tweeter (RH) generates noise when a five-volt voltage is applied on the tweeter (RH) terminal.

Q: Is the tweeter (RH) generating noise?

YES: Go to Step 6.

NO: Replace the tweeter (RH). The tweeter (RH) should sound.




STEP 6. Check tweeter (RH) connector C-111 and radio and CD player with CD changer connector C-117 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Are harness connectors C-111 and C-117 in good condition?

YES: Go to Step 7.

NO: Repair or replace the component(s). Refer to Harness Connector Inspection. The tweeter (RH) should sound.




STEP 7. Check the wiring harness between tweeter (RH) connector C-111 (terminals 1 and 2) and radio and CD player with CD changer connector C-117 (terminals 14 and 6).

Q: Is the wiring harness between tweeter (RH) connector C-111 (terminals 1 and 2) and radio and CD player with CD changer connector C-117 (terminals 14 and 6) in good condition?

YES: Replace the radio and CD player with CD changer. The tweeter (RH) should sound.

NO: Repair the wiring harness. The tweeter (RH) should sound.

STEP 8. Check the quarter speaker (LH).

1. Remove the quarter speaker (LH).




2. Check that the quarter speaker (LH) generates noise when a five-volt voltage is applied on the quarter speaker (LH) terminal.

Q: Is the quarter speaker (LH) generating noise?

YES: Go to Step 9.

NO: Replace the quarter speaker (LH). The quarter speaker (LH) should sound.










STEP 9. Check quarter speaker (LH) connector D-14 and radio and CD player with CD changer connector C-117 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Are harness connectors D-14 and C-117 in good condition?

YES: Go to Step 10.

NO: Repair or replace the damaged component(s). Refer to Harness Connector Inspection. The quarter speaker (LH) should sound.










STEP 10. Check the wiring harness between quarter speaker (LH) connector D-14 (terminals 1 and 2) and radio and CD player with CD changer connector C-117 (terminals 2 and 8).






NOTE: Also check intermediate connector C-23 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-23 is damaged, repair or replace the connectors as described in Harness Connector Inspection.

Q: Is the wiring harness between the quarter speaker (LH) connector D-14 (terminals 1 and 2) and audio amplifier connector C-117 (terminals 2 and 8) in good condition?

YES: Replace the radio and CD player with CD changer. The quarter speaker (LH) should sound.

NO: Repair the wiring harness. The quarter speaker (LH) should sound.

STEP 11. Check the quarter speaker (RH).

1. Remove the quarter speaker (RH).




2. Check that the quarter speaker (RH) generates noise when a five-volt voltage is applied on the quarter speaker (RH) terminal.

Q: Is the quarter speaker (RH) generating noise?

YES: Go to Step 12.

NO: Replace the quarter speaker (RH). The quarter speaker (RH) should sound.










STEP 12. Check quarter speaker (RH) connector D-05 and radio and CD player with CD changer connector C-117 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Are harness connectors D-05 and C-117 in good condition?

YES: Go to Step 13.

NO: Repair or replace the component(s). Refer to Harness Connector Inspection. The quarter speaker (RH) should sound.










STEP 13. Check the wiring harness between quarter speaker (RH) connector D-05 (terminals 1 and 2) and radio and CD player with CD changer connector C-117 (terminals 1 and 7).

NOTE: Also check intermediate connector C-11 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-11 is damaged, repair or replace the connectors as described in Harness Connector Inspection.

Q: Is the wiring harness between quarter speaker (RH) connector D-05 (terminals 1 and 2) and radio and CD player with CD changer connector C-117 (terminals 1 and 7) in good condition?

YES: Replace the radio and CD player with CD changer. The quarter speaker (RH) should sound.

NO: Repair the wiring harness. The quarter speaker (RH) should sound.