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Inspection Procedure 4




INSPECTION PROCEDURE 4: The audio does not operate normally by operating the radio and CD player of the center panel unit.

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

When the audio does not operate normally by operating the audio control unit of the center panel unit, the radio and CD player, center panel unit, or the power supply circuit system of center panel unit may be faulty.

PROBABLE CAUSES

- The radio and CD player may be defective.
- The center panel unit may be defective.
- Damaged harness wires and connectors

DIAGNOSIS

Required Special Tools:

- MB991223: Harness Set
- MB992006: Extra Fine Probe

STEP 1. Check center panel unit connector C-205 and radio and CD player connector C-105 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q. Are center panel unit connector C-205 and radio and CD player connector C-105 in good condition?

YES Go to Step 2.
NO Repair or replace the damaged component(s) Harness Connector Inspection).
STEP 2. Check the wiring harness between center panel unit connector C-205 (terminal 1, 5) and radio and CD player connector C-105 (terminal 8, 18).

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

Q. Is the wiring harness between center panel unit connector C-205 (terminal 1, 5) and radio and CD player connector C-105 (terminal 8, 18) in good condition?

YES Go to Step 3.
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 3. Check the ground circuit to the center panel unit. Measure the resistance at center panel unit connector C-205.

(1)Disconnect the connector, and measure at the wiring harness side.





(2)Measure resistance between terminal 6 and ground.
OK: The resistance should be 2 ohm 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 center panel unit connector C-205 (terminal 6) and ground.

- Check the ground wire for open circuit.

NOTE:
Also joint connector C-231 and grounding connector C-01 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If joint connector joint connector C-231 and grounding connector C-01 are damaged, repair or replace the connector as described in Harness Connector Inspection Harness Connector Inspection.

Q. Is the wiring harness between center panel unit connector C-205 (terminal 6) and ground in good condition?

YES Check the trouble symptom.
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 center panel unit. Measure the voltage at center panel unit connector C-205.

(1)Disconnect the connector, and measure at the harness side connector.





(2)Measure voltage between terminal 7 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 center panel unit connector C-205 (terminal 7) and fusible link (36).

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

NOTE:
Also ETACS-ECU connector C-417, C-406 and joint connector C-102 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If joint connector ETACS-ECU connector C-417, C-406 and joint connector C-102 are damaged, repair or replace the connector as described in Harness Connector Inspection Harness Connector Inspection.

Q. Is the wiring harness between center panel unit connector C-205 (terminal 7) and fusible link (36) in good condition?

YES Check the trouble symptom.
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. Replace the center panel unit temporarily, and check the trouble symptom.

Replace the center panel unit temporarily, and check that the audio works normally.

Q. Is the check result normal?

YES Replace the center panel unit.
NO Replace the radio and CD player.
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