Inspection Procedure 19

INSPECTION PROCEDURE 19: Radio: Preset Stations are Erased.

Memory Backup Power Supply Circuit:

CIRCUIT OPERATION
The power is constantly supplied to the radio and CD player.

TECHNICAL DESCRIPTION (COMMENT)
The cause is probably a faulty radio and CD player memory backup power supply circuit system.

TROUBLESHOOTING HINTS
- Damaged harness wire or connector.
- Malfunction of the radio and CD player.

DIAGNOSIS

Required Special Tool:
- MB991223: Harness set







STEP 1. Check at radio and CD player connector C-11 in order to check the power supply circuit to the radio and CD player (through the battery).

1. Disconnect radio and CD player connector C-11, and measure at the wiring harness side.
2. Measure the voltage between terminal number 7 and ground.
- The measured value should be approximately 12 volts (battery positive voltage).

Q: Does the measured voltage correspond with this range?

YES: Either repair or replace the radio and CD player. Check that a memory is retained.
NO: Go to Step 2.




STEP 2. Check radio and CD player connector C-11 for damage.

Q: Is radio and CD player connector C-11 in good condition?

YES: Go to Step 3.
NO: Repair or replace the connector. Refer to Harness Connector Inspection. Check that a memory is retained.










STEP 3. Check the wiring harnesses between radio and CD player connector C-11 (terminal 7) and battery

NOTE: Also check intermediate connector C-209, joint connector C-141. If intermediate connector C-209, joint connector C-141 is damaged, repair or replace the wiring harness. Refer to Harness Connector Inspection.

Q: Are the wiring harnesses between radio and CD player connector C-11 (terminal 7) and battery in good condition?

YES: Repair or replace the radio and CD player. Check that a memory is retained.
NO: Repair the wiring harness(es). Check that a memory is retained.