Inspection Procedure 4

INSPECTION PROCEDURE 4: The System does not Recognize the Remote Controlled Radio Switch (LH) Only. ]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 resistance at remote controlled radio switch (LH).

1. Remove the airbag module assembly (Refer to SRS, Air Bag Module(s) and Clock Spring).




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






Q: Is the resistance at the left remote controlled radio switch normal?

YES : Go to Step 2.

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

STEP 2. Check the radio switch (LH) connector C-311 and clock spring connector C-303 for loose, corroded or damaged terminals, or terminals pushed back in the connector.






Q: Is remote controlled radio switch (LH) connector C-311 and clock spring connector C-303 in good condition?

YES : Go to Step 3.

NO : Repair or replace the connector. Refer to General (Electrical), Harness Connector Inspection. The remote controlled radio switch (LH) should work normally.

STEP 3. Check the wiring harness between remote controlled radio switch connector C-311 (terminals 1 and 2) and clock spring connector C-303 (terminals 4 and 5).






Q: Are the wiring harness between remote controlled radio switch connector C-311 (terminals 1 and 2) and clock spring connector C-303 (terminals 4 and 5) in good condition?

YES : No action to be taken.

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