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Vehicles With Audio Amplifier




INSPECTION PROCEDURE 2: No sound is heard. [Vehicles with audio amplifier]

CAUTION:
Before replacing the radio and CD player or audio amplifier, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.






























COMMENTS ON TROUBLE SYMPTOM

If the audio sound is not output, the radio and CD player, audio amplifier, or power supply circuit of audio amplifier may have a problem. In addition, if any of the speakers is short-circuited, the protection circuit inside the radio and CD player disables all the speakers to sound. Therefore, if all the speakers do not output sound, the speaker circuit may be shorted or the speaker may be defective. Also, the option coding information may be inconsistent.

PROBABLE CAUSES

- Malfunctions of radio and CD player
- Malfunction of audio amplifier
- Malfunction of speaker or tweeter
- Option coding information inconsistency
- Damaged harness wires and connectors

DIAGNOSIS

Required Special Tools:

- MB991223: Harness Set
- MB992006: Extra Fine Probe

STEP 1. Check the ETACS-ECU coding data.

(1)
CAUTION:
To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

Connect scan tool MB991958. Refer to "How to connect the Scan Tool (M.U.T.-III) Reading and Clearing Diagnostic Trouble Codes."

(2)Operate the scan tool MB991958 to read the ETACS-ECU option coding information.
Programming and Relearning.)

(3)Check that the "Number of speaker" is set to "Premium."

Q. Is the check result normal?

YES Go to Step 2.
NO Operate scan tool MB991958 to set the option coding "Number of speaker" to "Premium", and check the trouble symptom.
STEP 2. Check audio amplifier connector D-06 and D-07 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q. Is audio amplifier connector D-06 and D-07 in good condition?

YES Go to Step 3.
NO Repair or replace the damaged component(s). Harness Connector Inspection.
STEP 3. Check the ground circuit to the rear monitor. Measure the resistance at audio amplifier connector D-07.

(1)Disconnect audio amplifier connector D-07, and measure the resistance available at the wiring harness side of the connector.





(2)Measure the resistance between terminal 24 and ground.
OK: The resistance should be 2 ohms or less.





(3)Measure the resistance between terminal 31 and ground.
OK: The resistance should be 2 ohms or less.





(4)Measure the resistance between terminal 32 and ground.
OK: The resistance should be 2 ohms or less.
Q. Is the measured resistance 2 ohms or less?

YES Go to Step 5.

NO Go to Step 4.

STEP 4. Check the wiring harness between audio amplifier connector D-07 (terminal 24, 31, 32) and ground.

- Check the ground wires for open circuit.

Q. Is the wiring harness between audio amplifier connector D-07 (terminal 24, 31, 32) and ground in good condition?

YES Go to Step 5.
NO The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary.
STEP 5. Check the power supply circuit to the ETACS-ECU. Measure the voltage at audio amplifier connector D-07.

(1)Disconnect audio amplifier connector D-07, and measure the voltage available at the wiring harness-side connector.





(2)Measure the voltage between terminal 25 and ground.
OK: The voltage should measure approximately 12 volts (battery positive voltage).





(3)Measure the voltage between terminal 35 and ground.
OK: The voltage should measure approximately 12 volts (battery positive voltage).





(4)Measure the voltage between terminal 36 and ground.
OK: The voltage should measure approximately 12 volts (battery positive voltage).
Q. Is the measured voltage approximately 12 volts (battery positive voltage)?

YES Go to Step 7.

NO Go to Step 6.

STEP 6. Check the wiring harness between audio amplifier connector D-07 (terminal 25, 35, 36) and fusible link (36).

- Check the power supply lines for open circuit and short circuit.

NOTE:
Also check intermediate connector C-15 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-15 is damaged, repair or replace the connector as described in Harness Connector Inspection Harness Connector Inspection.

Q. Is the wiring harness between audio amplifier connector D-07 (terminal 25, 35, 36) and fusible link (36) in good condition?

YES Go to Step 7.
NO The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary.
STEP 7. Check radio and CD player connector C-103 and C-105 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q. Are radio and CD player connector C-103 and C-105 in good condition?

YES Go to Step 8.
NO Repair or replace the damaged component(s). Harness Connector Inspection.
STEP 8. Check the wiring harness between radio and CD player connector C-105 (terminal 17) and audio amplifier connector D-06 (terminal 3)

- Check the communication line for open circuit and short circuit.

NOTE:
Also check intermediate connector C-16 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-16 is damaged, repair or replace the connector as described in Harness Connector Inspection Harness Connector Inspection.

Q. Is the wiring harness between radio and CD player connector C-105 (terminal 17) and audio amplifier connector D-06 (terminal 3) in good condition?

YES
Go to Step 9.

NO The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary.
STEP 9. Check the wiring harness between radio and CD player connector C-105 (terminal 7) and audio amplifier connector D-07 (terminal 34)

- Check the communication line for open circuit and short circuit.

NOTE:
Also check intermediate connector C-16 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-16 is damaged, repair or replace the connector as described in Harness Connector Inspection Harness Connector Inspection.

Q. Is the wiring harness between radio and CD player connector C-105 (terminal 7) and audio amplifier connector D-07 (terminal 34) in good condition?

YES
Go to Step 10.

NO The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary.
STEP 10. Check the following connectors.

Check the following connectors:

- F-11 front door speaker (LH) connector
- F-08 front door speaker (RH) connector
- F-23 rear door speaker (LH) connector
- F-20 rear door speaker (RH) connector
- F-02 tweeter (LH) connector
- F-03 tweeter (RH) connector
- D-14 sub woofer connector

Q. Are all the connectors in good condition?

YES Go to Step 11.
NO Repair the defective connector.
STEP 11. Check the speaker, tweeter or subwoofer.

(1)Remove the speaker, tweeter or subwoofer (Refer to Service and Repair).

(2)Check that the speaker or tweeter outputs the noise when the voltage of 5 V is applied to the speaker or tweeter connector terminal. [speaker or tweeter]

(3)Check that the subwoofer outputs the noise when the voltage of 5 V is applied to the subwoofer connector terminal. [subwoofer]

Q. Is the check result normal?

YES Go to Step 12.
NO Replace the speaker, tweeter or subwoofer.
STEP 12. Check the wiring harness between the speaker, tweeter or sub woofer connector terminal and the audio amplifier connector terminal.

Check the communication lines for short circuit.

- [Front door speaker (LH)] Check the wiring harness between front door speaker (LH) connector F-11 (terminal 1, 2) and audio amplifier connector D-07 (terminal 28, 38).
NOTE:
Also check intermediate connectors C-225 and C-16 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-225 or C-16 is damaged, repair or replace the connector as described in Harness Connector Inspection Harness Connector Inspection .

- [ Front door speaker (RH)] Check the wiring harness between front door speaker (RH) connector F-08 (terminal 1, 2) and audio amplifier connector D-07 (terminal 27, 37).
NOTE:
Also check intermediate connectors C-212 and C-16 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-212 or C-16 is damaged, repair or replace the connector as described in Harness Connector Inspection Harness Connector Inspection .

- [ Rear door speaker (LH)] Check the wiring harness between rear door speaker (LH) connector F-23 (terminal 1, 2) and audio amplifier connector D-06 (terminal 1, 7).
NOTE:
Also check intermediate connector F-22 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector F-22 is damaged, repair or replace the connector as described in Harness Connector Inspection Harness Connector Inspection .

- [ Rear door speaker (RH)] Check the wiring harness between rear door speaker (RH) connector F-20 (terminal 1, 2) and audio amplifier connector D-06 (terminal 2, 8).
NOTE:
Also check intermediate connector F-21 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector F-21 is damaged, repair or replace the connector as described in Harness Connector Inspection Harness Connector Inspection .

- [ Tweeter (LH)] Check the wiring harness between tweeter (LH) connector F-02 (terminal 1, 2) and audio amplifier connector D-06 (terminal 14, 6).
NOTE:
Also check intermediate connectors C-225 and C-16 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-225 or C-16 is damaged, repair or replace the connector as described in Harness Connector Inspection Harness Connector Inspection .

- [ Tweeter (RH)] Check the wiring harness between tweeter (RH) connector F-03 (terminal 1, 2) and audio amplifier connector D-06 (terminal 13, 5).
NOTE:
Also check intermediate connectors C-212 and C-16 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-212 or C-16 is damaged, repair or replace the connector as described in Harness Connector Inspection Harness Connector Inspection .

- [ Subwoofer] Check the wiring harness between subwoofer connector D-14 (terminal 1, 2, 3, 4) and audio amplifier connector D-07 (terminal No.30, 22, 29, 21).

Q. Is the wiring harness between the speaker, tweeter or sub woofer connector terminal and the audio amplifier connector terminal in good condition?

YES Go to Step 13.
NO Repair or replace the damaged component Harness Connector Inspection).
STEP 13. Check the harness wire between radio and CD player connector C-103 (terminal 26, 28, 36, 38) and audio amplifier connector D-06 (terminal 10, 4, 11, 12).

- Check the communication lines for short circuit.

NOTE:
Also check intermediate connector C-16 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-16 is damaged, repair or replace the connector as described in Harness Connector Inspection Harness Connector Inspection.

Q. Is the wiring harness between radio and CD player connector C-103 (terminal 26, 28, 36, 38) and audio amplifier connector D-06 (terminal 10, 4, 11, 12) in good condition?

YES Check the trouble symptom, go to Step 14.
NO Repair or replace the damaged component Harness Connector Inspection).
STEP 14. Retest the system

Check if the sound is output from all the speakers.

Q. Is the check result normal?

YES The trouble can be an intermittent malfunction How to Cope With Intermittent Malfunctions).
NO Go to Step 15.
STEP 15. Replace the audio amplifier temporarily, and check the trouble symptom.

Replace the audio amplifier temporarily, and check that the sound is output from all the speakers.

Q. Is the check result normal?

YES Replace the audio amplifier.
NO Replace the radio and CD player.
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