Inspection Procedure 6

INSPECTION PROCEDURE 6: No sound from one speaker. [Vehicles without audio amplifier]

Speaker System Circuit (Part 1):

Speaker System Circuit (Part 2):

CIRCUIT OPERATION
The speakers sound according to audio signal output from the radio and CD player.

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

TROUBLESHOOTING HINTS
- Malfunction of the speaker.
- Damaged wiring harness or connector.
- Malfunction of the radio and CD player.

DIAGNOSIS

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

STEP 1. Check which speaker has no sound on the 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.
Door speaker (LH) : Go to Step 8.
Door speaker (RH) : Go to Step 11.
Quarter speaker (LH) : Go to Step 14.
Quarter speaker (RH) : Go to Step 17.

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-130 and radio and CD player connector C-117 for loose, corroded or damaged terminals, or terminals pushed back in the connector.










Q: Are harness connectors C-130 and C-117 in good condition?

YES : Go to Step 4.

NO : Repair or replace the component(s). The tweeter (LH) should sound.

STEP 4. Check the wiring harness between tweeter (LH) connector C-130 (terminals 1 and 2) and radio and CD player connector C-117 (terminals 5 and 13).










Q: Is the wiring harness between tweeter (LH) connector C-130 (terminals 1 and 2) and radio and CD player connector C-117 (terminals 5 and 13) in good condition?

YES : The procedure is complete.

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-110 and radio and CD player connector C-117 for loose, corroded or damaged terminals, or terminals pushed back in the connector.







Q: Are harness connectors C-110 and C-117 in good condition?

YES : Go to Step 7.

NO : Repair or replace the component(s). The tweeter (RH) should sound.

STEP 7. Check the wiring harness between tweeter (RH) connector C-110 (terminals 1 and 2) and radio and CD player connector C-117 (terminals 6 and 14).







Q: Is the wiring harness between tweeter (RH) connector C-110 (terminals 1 and 2) and radio and CD player connector C-117 (terminals 6 and 14) in good condition?

YES : The procedure is complete.

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

STEP 8. Check the door speaker (LH).

1. Remove the door speaker (LH).







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

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

YES : Go to Step 9.

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

STEP 9. Check door speaker (LH) connector E-13 and radio and CD player connector C-117 for loose, corroded or damaged terminals, or terminals pushed back in the connector.










Q: Are harness connectors E-13 and C-117 in good condition?

YES : Go to Step 10.

NO : Repair or replace the component(s). The door speaker (LH) should sound.

STEP 10. Check the wiring harness between door speaker (LH) connector E-13 (terminals 1 and 2) and radio and CD player connector C-117 (terminals 5 and 13).













NOTE: Also check intermediate connector C-25 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-25 is damaged, repair or replace the connector.

Q: Is the wiring harness between front door speaker (LH) connector E-13 (terminals 1 and 2) and radio and CD player connector C-117 (terminals 5 and 13) in good condition?

YES : The procedure is complete.

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

STEP 11. Check the door speaker (RH).

1. Remove the door speaker (RH).







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

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

YES : Go to Step 12.

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

STEP 12. Check door speaker (RH) connector E-07 and radio and CD player connector C-117 for loose, corroded or damaged terminals, or terminals pushed back in the connector.










Q: Are harness connectors E-07 and C-117 in good condition?

YES : Go to Step 13.

NO : Repair or replace the component(s). The door speaker (RH) should sound.

STEP 13. Check the wiring harness between door speaker (RH) connector E-07 (terminals 1 and 2) and radio and CD player connector C-117 (terminals 6 and 14).










NOTE: Also check intermediate connector C-09 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-09 is damaged, repair or replace the connector.

Q: Is the wiring harness between front door speaker (RH) connector E-07 (terminals 1 and 2) and radio and CD player connector C-117 (terminals 6 and 14) in good condition?

YES : The procedure is complete.

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

STEP 14. 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 15.

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

STEP 15. Check quarter speaker (LH) connector D-14 and radio and CD player 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 16.

NO : Repair or replace the component(s). The quarter speaker (LH) should sound.

STEP 16. Check the wiring harness between quarter speaker (LH) connector D-14 (terminals 1 and 2) and radio and CD player 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.

Q: Is the wiring harness between the rear speaker (LH) connector D-14 (terminals 1 and 2) and radio and CD player connector C-117 (terminals 2 and 8) in good condition?

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

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

STEP 17. 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 18.

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

STEP 18. Check quarter speaker (RH) connector D-05 and radio and CD player 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 19.

NO : Repair or replace the component(s). The quarter speaker (RH) should sound.

STEP 19. Check the wiring harness between rear speaker (RH) connector D-05 (terminals 1 and 2) and radio and CD player 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.

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

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

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