Inspection Procedure 1

Inspection Procedure 1: A satellite radio cannot be received.

CAUTION:
Before replacing the satellite radio tuner, antenna feeder cable, radio and CD player [vehicles with radio and CD player] or multivision display [vehicles with MMCS], ensure that the power supply circuit, the ground circuit and the communication circuit are normal.














COMMENTS ON TROUBLE SYMPTOM

There may be a failure in the wiring harness from the satellite radio tuner to the radio and CD player [vehicles with radio and CD player] or multivision display [vehicles with MMCS], its respective connector(s), the satellite radio tuner, the radio and CD player [vehicles with radio and CD player] or the multivision display [vehicles with MMCS].

PROBABLE CAUSES

- Malfunctions of satellite radio tuner
- Malfunctions of radio and CD player[ vehicles with radio and CD player] or multivision display[ vehicles with MMCS]
- Damaged harness wires and connectors

DIAGNOSIS

STEP1. Check whether AM or FM broadcast frequency is received.

Check whether AM or FM broadcast frequency is received.

Q. Is AM or FM broadcast frequency received?

YES Go to Step 2.
NO Diagnose the radio and CD player [vehicles with radio and CD player] or the multivision display [vehicles with MMCS]. Refer to Symptom Chart [vehicles with radio and CD player] or Symptom Chart [vehicles with MMCS].
STEP 2. Using scan tool MB991958, diagnose the CAN bus line.

(1)
CAUTION:
To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

Connect scan tool MB991958. Reading and Clearing Diagnostic Trouble Codes."

(2)Turn the ignition switch to the "ON" position.

(3)Diagnose the CAN bus line.

(4)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the CAN bus line found to be normal?

YES [vehicles with radio and CD player] : Go to Step 3.
YES [vehicles with MMCS] : Go to Step 6.
NO Repair the CAN bus line. CAN Bus Diagnostics Chart).
STEP 3. Check satellite radio tuner connector C-37 and radio and CD player connector C-105 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q. Is satellite radio tuner connector C-37 or radio and CD player connector C-105 in good condition?

YES Go to Step 4.
NO Repair or replace the damaged component(s). Harness Connector Inspection.
STEP 4. Check the wiring harness between satellite radio tuner connector C-37 (terminal 6, 14) and radio and CD player connector C-105 (terminal 15, 6).

- Check the communication lines for open circuit and short circuit.

Q. Is the wiring harness between satellite radio tuner connector C-37 (terminal 6, 14) and radio and CD player connector C-105 (terminal 15, 6) in good condition?

YES Go to Step 5.
NO The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary.
STEP5. Substitute a known good radio and CD player, and check the trouble symptom.

Check whether satellite radio broadcast can be received.

Q. Can a satellite radio be received?

YES Replace the radio and CD player.
NO Replace the satellite radio tuner.
STEP 6. Check satellite radio tuner connector C-37 and multivision display connector C-111 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q. Is satellite radio tuner connector C-37 or multivision display connector C-111 in good condition?

YES Go to Step 7.
NO Repair or replace the damaged component(s). Harness Connector Inspection.
STEP 7. Check the wiring harness between satellite radio tuner connector C-37 (terminal 6, 14) and multivision display connector C-111 (terminal 105, 107).

- Check the communication lines for open circuit and short circuit.

NOTE:
Also check intermediate connector C-106 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-106 is damaged, repair or replace the connector as described in Harness Connector Inspection Harness Connector Inspection.

Q. Is the wiring harness between satellite radio tuner connector C-37 (terminal 6, 14) and multivision display connector C-111 (terminal 105, 107) in good condition?

YES Go to Step 8.
NO The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary.
STEP8. Substitute a known good multivision display, and check the trouble symptom.

Check whether satellite radio broadcast can be received.

Q. Can a satellite radio be received?

YES Replace the multivision display.
NO Replace the satellite radio tuner.