Inspection Procedure 7

INSPECTION PROCEDURE 7: No sound from door speaker or woofer. [Vehicles with audio amplifier]

Speaker System Circuit (Door Speaker And Woofer) (Part 1):

Speaker System Circuit (Door Speaker And Woofer) (Part 2):

CIRCUIT OPERATION
The sound signals are sent from the audio amplifier. 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 door speaker.
- Malfunction of the woofer.
- Malfunction of the audio amplifier.
- Damaged wiring harness or connector.

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?
Door speaker (LH) : Go to Step 2.
Door speaker (RH) : Go to Step 5.
Woofer : Go to Step 8.

STEP 2. 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 3.

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

STEP 3. Check door speaker (LH) connector E-13 and audio amplifier connector C-114 for loose, corroded or damaged terminals, or terminals pushed back in the connector.







Q: Are harness connectors E-13 and C-114 in good condition?

YES : Go to Step 4.

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

STEP 4. Check the wiring harness between door speaker (LH) connector E-13 (terminals 1 and 2) and audio amplifier connector C-114 (terminals 8 and 18).







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 as described.

Q: Is the wiring harness between front door speaker (LH) connector E-13 (terminals 1 and 2) and audio amplifier connector C-114 (terminals 8 and 18) in good condition?

YES : Replace the audio amplifier. The door speaker (LH) should sound.

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

STEP 5. 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 6.

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

STEP 6. Check door speaker (RH) connector E-07 and audio amplifier connector C-114 for loose, corroded or damaged terminals, or terminals pushed back in the connector.







Q: Are harness connectors E-07 and C-114 in good condition?

YES : Go to Step 7.

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

STEP 7. Check the wiring harness between door speaker (RH) connector E-07 (terminals 1 and 2) and audio amplifier connector C-114 (terminals 7 and 17).







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 as described.

Q: Is the wiring harness between front door speaker (RH) connector E-07 (terminals 1 and 2) and audio amplifier connector C-114 (terminals 7 and 17) in good condition?

YES : Replace the audio amplifier. The door speaker (RH) should sound.

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

STEP 8. Check the woofer.

1. Remove the woofer.







2. Check that the woofer generates noise when a five-volt voltage is applied on the woofer terminal.

Q: Is the woofer generating noise?

YES : Go to Step 9.

NO : Replace the woofer. The woofer should sound.

STEP 9. Check woofer connector D-12 for loose, corroded or damaged terminals, or terminals pushed back in the connector.







Q: Is harness connector D-12 in good condition?

YES : Go to Step 10.

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

STEP 10. Check the sub harness between the woofer and the woofer connector. Measure the resistance at woofer connector D-12.

NOTE: Check the sub harness with the woofer connected to the sub harness.







1. Disconnect woofer connector D-12, and measure the resistance available at the component side of the connector.







2. Measure the resistance between woofer connector D-12 terminals 1 and 2.
- The resistance should be 2 ohms or less.

3. Measure the resistance between woofer connector D-12 terminals 3 and 4.
- The resistance should be 2 ohms or less.

Q: Is the measured resistance 2 ohms or less?

YES : Go to Step 11.

NO : Repair the sub harness. The woofer should sound.

STEP 11. Check audio amplifier connector C-114 for loose, corroded or damaged terminals, or terminals pushed back in the connector.







Q: Is harness connector C-114 in good condition?

YES : Go to Step 12.

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

STEP 12. Check the wiring harness between woofer connector D-12 (terminals 1, 2, 3 and 4) and audio amplifier connector C-114 (terminals 10, 2, 9 and 1).







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 connector as described.

Q: Is the wiring harness between woofer connector D-12 (terminals 1, 2, 3 and 4) and audio amplifier connector C-114 (terminals 10, 2, 9 and 1) in good condition?

YES : Replace the audio amplifier. The woofer should sound.

NO : Repair the wiring harness. The woofer should sound.