Inspection Procedure 4

INSPECTION PROCEDURE 4: Remote controlled radio switch: The system does not recognize the remote controlled radio switch (LH) only.

CIRCUIT OPERATION
If the remote controlled radio switch is operated, the output voltage will change. The radio and CD player with CD changer operates according to the change on the voltage. You can 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).

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

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

DIAGNOSIS

Required Special Tools:
- MB991223: Harness set
- MB992006: Extra Fine Probe

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 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 (terminals1 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.