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 audio visual navigation unit [vehicles with MMCS], ensure that the power supply circuit, the ground circuit and the communication circuit are normal.

Satellite Radio Tuner Communication Circuit <Vehicles With Radio And CD Changer>:

Satellite Radio Tuner Communication Circuit [Vehicles With MMCS]:

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 audio visual navigation unit [vehicles with MMCS], its respective connector(s), the satellite radio tuner, the CD player [vehicles with radio and CD player] or the audio visual navigation unit [vehicles with MMCS].

PROBABLE CAUSES
- Malfunctions of satellite radio tuner
- Malfunctions of radio and CD player [vehicles with radio and CD player] or audio visual navigation unit [vehicles with MMCS]
- Damaged harness wires and connectors

DIAGNOSIS

Required Special Tools:
- MB991223: Harness Set
- MB992006: Extra Fine Probe
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V.C.I.)
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A

STEP 1. 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 audio visual navigation unit [vehicles with MMCS] (Refer to [vehicles with radio and CD player] or [vehicles with MMCS]). Trouble Symptom Chart Trouble Symptom Chart

STEP 2. Using scan tool MB991958, diagnose the CAN bus line.

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.







1. Connect scan tool MB991958 to the data link connector.
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 [vehicles with radio and CD player or MMCS] : Repair the CAN bus line.

STEP 3. Check satellite radio tuner connector C-17 and radio and CD player connector C-106 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is satellite radio tuner connector C-17 or radio and CD player connector C-106 in good condition?

YES : Go to Step 4.

NO : Repair or replace the damaged component(s).

STEP 4. Check the wiring harness between satellite radio tuner connector C-17 (terminal 6, 14) and radio and CD player connector C-106 (terminal 15,16).

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

Q: Is the wiring harness between satellite radio tuner connector C-17 (terminal 6, 14) and radio and CD player connector C-106 (terminal 15, 16) 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.

STEP 5. 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-17 and audio visual navigation unit connector C-11 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is satellite radio tuner connector C-17 or audio visual navigation unit connector C-11 in good condition?

YES : Go to Step 7.

NO : Repair or replace the damaged component(s).

STEP 7. Check the wiring harness between satellite radio tuner connector C-17 (terminal 6, 14) and audio visual navigation unit connector C-11 (terminal 85, 87).

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

NOTE: Also check intermediate connector C-107 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-107 is damaged, repair or replace the connector as described.

Q: Is the wiring harness between satellite radio tuner connector C-17 (terminal 6, 14) and audio visual navigation unit connector C-11 (terminal 85, 87) 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.

STEP 8. Substitute a known good audio visual navigation unit, and check the trouble symptom.

Check whether satellite radio broadcast can be received.

Q: Can a satellite radio be received?

YES : Replace the audio visual navigation unit.

NO : Replace the satellite radio tuner.