Inspection Procedure 2

INSPECTION PROCEDURE 2: When Remote Controlled Radio Power Switch is Turned "ON", no Power is Available. But Radio, CD Player and CD Changer Power Switch is Available. [Vehicles with Audio Amplifier]

Remote Controlled Radio Switch Power Supply Circuit:

CIRCUIT OPERATION
- If the remote controlled radio switch is operated, the output voltage will change. The radio, CD player and CD changer operates according to the change on the voltage. You can switch on/off the audio unit, control the mode and volume by the remote controlled radio switch (RH). You can select a CD track and pre-set radio station, and tune it by the remote controlled radio switch (LH).

NOTE: You can switch on the audio unit by the remote controlled switch, but can not switch it off.

TECHNICAL DESCRIPTION (COMMENT)
If the system does not recognize the remote controlled radio switches (RH), the clock spring or the radio, CD player and CD changer may be defective.

TROUBLESHOOTING HINTS
- Malfunction of the remote controlled radio switch (RH)
- Malfunction of the radio, CD player and CD changer
- Malfunction of the clock spring
- Damaged wiring harness or connectors

DIAGNOSIS

Required Special Tool:
- MB991223: Harness set

STEP 1. Measure the voltage at remote controlled radio switch power supply circuit at the clock spring connector C-306.







1. Disconnect the clock spring connector C-306.
2. Turn the ignition switch to "ON" position.







3. Measure the voltage between clock spring connector C-306 (radio, CD player and CD changer side) terminal 2 and ground.
- The measured value should be approximately 5 volts.

Q: Is the measured voltage approximately 5 volts?

YES : Go to Step 4.

NO : Go to Step 2.

STEP 2. Check radio, CD player and CD changer connector C-134 and clock spring connector C-306 for loose, corroded or damaged terminals, or terminals pushed back in the connector.







Q: Are radio, CD player and CD changer connector C-134 and clock spring connector C-306 in good condition?

YES : Go to Step 3.

NO : Repair or replace the damaged component(s). The remote controlled radio switch should work normally.

STEP 3. Check the wiring harness between radio, CD player and CD changer connector C-134 (terminal 42) and clock spring connector C-306 (terminal 2).







- Check the wiring harness for open circuit and short circuit.

Q: Is the wiring harness between radio, CD player and CD changer connector C-134 (terminal 42) and clock spring connector C-306 (terminal 2) in good condition?

YES : Go to Step 4.

NO : Repair the wiring harness. The remote controlled radio switch should work normally.

STEP 4. Measure the resistance at remote controlled radio switch ground circuit to the clock spring connector C-306.







1. Disconnect the clock spring connector C-306.







2. Measure resistance between terminal 3 and ground.
- The measured value should be 2 ohm or less.

Q: Is the measured resistance 2 ohms or less?

YES : Go to Step 7.

NO : Go to Step 5.

STEP 5. Check radio, CD player and CD changer connector C-134 and clock spring connector C-306 for loose, corroded or damaged terminals, or terminals pushed back in the connector.







Q: Are radio, CD player and CD changer connector C-134 and clock spring connector C-306 in good condition?

YES : Go to Step 6.

NO : Repair or replace the component(s). The remote controlled radio switch should work normally.

STEP 6. Check the wiring harness between radio, CD player and CD changer connector C-134 (terminal 31) and clock spring connector C-306 (terminal 3).







- Check the wiring harness for open circuit and short circuit.

Q: Is the wiring harness between radio, CD player and CD changer connector C-134 (terminal 31) and clock spring connector C-306 (terminal 3) in good condition?

YES : Go to Step 7.

NO : Repair the wiring harness. The remote controlled radio switch should work normally.

STEP 7. Measure the resistance between the clock spring connector C-306 terminals.







1. Disconnect the clock spring connector C-306.







2. Measure the resistance between clock spring connector C-306 (clock spring side) terminals 2 and 3. Operate the right and left remote controlled radio switches, and check that the table below is satisfied.







NOTE: When checking the right remote controlled radio switch, do not operate the left remote controlled radio switch.

Q: Is the resistance between terminals 2 and 3 normal?

YES : This malfunction is intermittent.

NO : Go to Step 8.

STEP 8. Measure the resistance at clock spring terminal.

1. Remove the clock spring.







2. Measure the resistance at clock spring connectors C-303 and C-306.







Q: Is the measured resistance 2 ohms or less?

YES : Go to Step 9.

NO : Replace the clock spring.

STEP 9. Check the clock spring connector C-303 and remote controlled radio switch (RH) connector C-301 for loose, corroded or damaged terminals, or terminals pushed back in the connector.







Q: Are clock spring connector C-303 and remote controlled radio switch (RH) connector C-301 in good condition?

YES : Go to step 10.

NO : Repair or replace the component(s). The remote controlled radio switch should work normally.

STEP 10. Check the wiring harness between clock spring connector C-303 (terminals 4 and 5) and remote controlled radio switch (RH) connector C-301 (terminals 1 and 2).







- Check the wiring harness for open circuit and short circuit.

Q: Is the wiring harness between clock spring connector C-303 (terminals 4 and 5) and remote controlled radio switch (RH) connector C-301 (terminals 1 and 2) in good condition?

YES : Go to Step 11.

NO : Repair the wiring harness. The remote controlled radio switch should work normally.

STEP 11. Measure the resistance at remote controlled radio switch (RH).

1. Remove the airbag module assembly.







2. Measure the resistance by operating the remote controlled radio switch (RH) in each position.







Q: Are the resistance at the right remote controlled radio switch normal?

YES : Replace the radio, CD player and CD changer.

NO : Replace the remote controlled radio switch (RH).