Inspection Procedure 20

Preset Stations are Erased.






CIRCUIT OPERATION
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 radio and CD player connector C-103 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is radio and CD player connector C-103 in good condition?

YES: Go to Step 2.

NO: Repair or replace the damaged components). Refer to Harness Connector Inspection. Check that a radio station is retained in memory.

STEP 2. Check at radio and CD player connector C-103 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-103.




2. Measure the voltage between terminal number 11 and ground by backprobing.
- The measured value should be approximately 12 volts (battery positive voltage).

Q: Is the measured voltage approx. 12V?

When YES : Replace the radio and CD player. Check that memory is retained.

NO: Go to Step 3.




STEP 3. Check the wiring harness between radio and CD player connector C-103 (terminal 11) and battery.

NOTE: Also check intermediate connector C-129 and joint connector C-05 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-129 or joint connector C-05 is damaged, repair or replace the connector as described in Harness Connector Inspection.

Q: Is the wiring harness between radio and CD player connector C-103 (terminal 11) and battery in good condition?

YES: Replace the radio and CD player. Check that memory is retained.

NO: Repair the wiring harness. Check that memory is retained.