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Vehicles Without Audio Amplifier




INSPECTION PROCEDURE 2: No sound is heard. [Vehicles without audio amplifier]

CAUTION:
Before replacing the radio and CD player, 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 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 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 "4 speakers" or "6 speakers".

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 "4 speakers" or "6 speakers", and check the trouble symptom.
STEP 2. 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[ vehicles with 6-speaker]
- F-03 tweeter (RH) connector[ vehicles with 6-speaker]

Q. Are all the connectors in good condition?

YES Go to Step 3.
NO Repair the defective connector.
STEP 3. Check the speaker or tweeter.

(1)Remove the speaker or tweeter (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.

Q. Does the speaker or tweeter output the noise?

YES Go to Step 4.
NO Replace the speaker or tweeter.
STEP 4. Check radio and CD player connector C-103 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

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

YES Go to Step 5.
NO Repair or replace the damaged component Harness Connector Inspection).
STEP 5. Check the wiring harness between the speaker or tweeter connector terminal and the radio and CD player 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 radio and CD player connector C-103 (terminal 28, 38).
NOTE:
Also check intermediate connector C-225 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-225 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 radio and CD player connector C-103 (terminal 26, 36).
NOTE:
Also check intermediate connector C-212 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-212 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 radio and CD player connector C-103 (terminal 27, 37).
NOTE:
Also check intermediate connectors C-26 and F-22 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-26 or 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 radio and CD player connector C-103 (terminal 25, 35).
NOTE:
Also check intermediate connectors C-17 and F-21 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-17 or 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 radio and CD player connector C-103 (terminal 38, 28).
NOTE:
Also check intermediate connector C-225 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-225 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 radio and CD player connector C-103 (terminal 36, 26).
NOTE:
Also check intermediate connector C-212 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-212 is damaged, repair or replace the connector as described in Harness Connector Inspection Harness Connector Inspection .

Q. Is the wiring harness between the speaker or tweeter connector terminal and the radio and CD player connector terminal in good condition?

YES Go to Step 6.
NO Repair or replace the damaged component(s). Harness Connector Inspection.
STEP 6. 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 Replace the radio and CD player.
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