Inspection Procedure 19

INSPECTION PROCEDURE 19: Preset Station are Erased.

Memory Backup Power 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 wiring harness 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-102 by backprobing in order to check the power supply circuit to the radio and CD player (through the battery).




1. Do not disconnect radio and CD player connector C-102.




2. Measure the voltage between terminal number 11 and ground by backprobing.
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-102 for damage.

Q: Is radio and CD player connector C-102 in good condition?

YES: Go to Step 5.

NO: Repair or replace the connector. Check that a memory is retained.




STEP 5. Check the wiring harness between radio and CD player connector C-102 (terminal 11) and battery.

NOTE: Also check joint connector C-02 and intermediate connector C-116. If joint connector C-02 or intermediate connectors C-116 is damaged, repair or replace the connector as described in Harness Connector Inspection.

Q: Are the wiring harness between radio and CD player connector C-22 (terminal 11) 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. Check that a memory is retained.