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Inspection Procedure 2 [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.


















TECHNICAL DESCRIPTION (COMMENT)

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, or the option coding information may be inconsistent.

TROUBLESHOOTING HINTS

- Radio and CD player may be defective

- Audio amplifier may be defective

- Option coding information inconsistency

- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector

DIAGNOSIS

Required Special Tools:

- MB991223: Harness Set

- MB992006: Extra Fine Probe

- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V.C.I.)

- MB991827: M.U.T.-III USB Cable

- MB991910: M.U.T.-III Main Harness A

STEP 1. Check the ETACS-ECU coding data.

(1)Operate the scan tool MB991958 to read the ETACS-ECU option coding information
Coding List).

(2)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-25 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q. Is audio amplifier connector D-25 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-25.

(1)Disconnect audio amplifier connector D-25, 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-25 (terminal 24, 31, 32) and ground.

- Check the ground wires for open circuit.

Q. Is the wiring harness between audio amplifier connector D-25 (terminal 24, 31, 32) and ground in good condition?

YES The trouble can be an intermittent malfunction How to Cope With Intermittent Malfunctions).
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-25.

(1)Disconnect audio amplifier connector D-25, 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-25 (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-39 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-39 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-25 (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-106 and audio amplifier connector D-26 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q. Are radio and CD player connector C-106 and audio amplifier D-26 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-106 (terminal 17) and audio amplifier connector D-26 (terminal 3)

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

NOTE:
Also check intermediate connector C-21 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-21 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-106 (terminal 17) and audio amplifier connector D-26 (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-106 (terminal 7) and audio amplifier connector D-25 (terminal 34)

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

NOTE:
Also check intermediate connector C-21 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-21 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-106 (terminal 7) and audio amplifier connector D-25 (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. Retest the system

Replace the audio amplifier, then check that the audio sound is output.

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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