Inspection Procedure 1: Power of the radio and tape player does not turn ON when the ignition switch is in the "ACC" position or "ON" position. <Vehicles without Auto Stop & Go (AS&G) System>



caution Before replacing the radio and CD player, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.

OPERATION


When the ignition switch is in the ON or ACC position, the radio and CD player power can be turned ON. With the radio and CD player power ON, when the ignition switch is turned to the OFF position, the power for radio and CD player is also turned OFF.

COMMENTS ON TROUBLE SYMPTOM


Provided that the audio diagnosis code is not set, if the power for radio and CD player cannot be turned ON, the radio and CD player, or power supply circuit for radio and CD player may have a problem, or the option coding information may be inconsistent.

PROBABLE CAUSES



  • Malfunction of radio and CD player
  • Malfunction of the ETACS-ECU
  • Option coding information inconsistency
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE


STEP 1. ETACS-ECU coding data check


(1)Operate the M.U.T.-III to read the ETACS-ECU option coding information (Refer to GROUP 00 - Coding Table ).
(2)Check that the "AUDIO" is set to "Present."

Q. Is the check result normal?

Go to Step 2.
Operate the M.U.T.-III to set the option coding "AUDIO" to "Present," and check the trouble symptom.

STEP 2. M.U.T.-III CAN bus diagnostics


Use the M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?

Go to Step 3.
Repair the CAN bus line.

STEP 3. M.U.T.-III other system diagnosis code


Check if the diagnosis code is set to the ETACS-ECU.

Q. Is the check result normal?

Troubleshoot the ETACS-ECU. Refer to ETACS-ECU - Troubleshooting .
Go to Step 4.

STEP 4. M.U.T.-III other system data list


Check the input signal of ACC relay.

  • Turn the ignition switch to the ACC position.
Item No.
Item name
Normal condition
Item 288
ACC switch
ON
OK: Normal condition is displayed.

Q. Is the check result normal?

Go to Step 5.
Refer to ETACS - Inspection Procedure 1 "The ignition switch (ACC) signal is not received" .

STEP 5. Check of short to power supply, short to earth, and open circuit in ACC line between radio and CD player connector and ETACS-ECU connector


Q. Is the check result normal?

Go to Step 6.
Repair the connector(s) or wiring harness.

STEP 6. Voltage measurement at radio and CD player connector (+B2 terminal).


(1)Disconnect the connector, and measure at the wiring harness side.
(2)Check the voltage between the radio and CD player connector (+B2 terminal) and body earth.
OK: System voltage

Q. Is the check result normal?

YES <Vehicles without display audio> : Go to Step 8.
YES <Vehicles with display audio> : Go to Step 9.
NO : Go to Step 7.

STEP 7. Check of short to power supply, short to earth, and open circuit in +B2 line between fusible link and radio and CD player connector


Q. Is the check result normal?

The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
Repair the connector(s) or wiring harness.

STEP 8. Check of open circuit in GND2 line between radio and CD player connector and body earth


Q. Is the check result normal?

Go to Step 9.
Repair the connector(s) or wiring harness.

STEP 9. Check that the radio and CD player is correctly earthed


The radio and CD player should be connected to the earth with an assembling screw.

Q. Is the radio and CD player correctly earthed?

Go to Step 10.
Securely install and earth the radio and CD player.

STEP 10. Retest the system


Check if the radio and CD player power is turned ON.

Q. Is the check result normal?

The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
Replace the radio and CD player.