2004 MITSUBISHI ENDEAVOR Radio

INSPECTION PROCEDURE 13: Noise is Detected with Engine Running.
).
STEP 3. Verify that the following actions disappear the noise.
1. Tune to a station with a stronger wave.
2. Extend the antenna completely (Mast antenna).
3. Adjust the sound quality to suppress high tones.
Q: Is the noise eliminated?
YES: Consult the radio manufacturer's service center.
NO: Go to Step 4.
STEP 4. Verify that the radio is correctly grounded
The radio is connected to the ground with an assembling screw.
Q: Is the radio correctly grounded?
YES: Go to Step 5.
NO: Consult the radio manufacturer's service center.
STEP 5. Check the connection of the antenna plug and radio and CD
player.
Q: Is the antenna plug thoroughly connected to the radio and CD player?
YES: Go to Step 7 .
NO: Go to Step 6.
STEP 6. Verify that the noise is eliminated when the antenna plug is
properly attached.
Q: Is the noise eliminated?
YES: Consult the radio manufacturer's service center.
NO: Go to Step 7.
STEP 7. Verify that the antenna is in good condition and is it properly

2004 Mitsubishi Endeavor LS
2004 BODY & ACCESSORIES Radio With Tape Player & Cd Player - Endeavor

mounted
.
Q: Is the antenna in good condition and is it properly mounted?
YES: Consult the radio manufacturer's service center.
NO: Either repair or replace the antenna assembly. Check to see that the
noise is gone.
INSPECTION PROCEDURE 12: Excessive Noise on AM and FM. DIAGNOSIS Radio reception can be affected by Radio Frequency (RF) emissions from a variety
of sources. The disturbance is even greater if the station is weak or poorly tuned.
FM reception is not as sensitive to disturbances as AM. AM reception is sensitive to
electrical disturbances such as power lines, lightening and other types of similar
electrical phenomena.
STEP 1. Check if the customer heard the noise under any of the following
conditions.
A motorcycle was passing. Lighting was flashing. Passed beneath a power line. Passed beneath a telephone line. Passed by a signal generator. Passed by any other sources of electrical noise. Passed under a bridge or through a tunnel.
Q: Did the noise occur during any of the circumstances listed above?
YES: The observed noise is normal.
NO: Go to Step 2.
STEP 2. Compare the customers radio to another identical model.
Operate the radio in a vehicle with a known good audio system of the same
t
ype as the customer's.

2004 Mitsubishi Endeavor LS
2004 BODY & ACCESSORIES Radio With Tape Player & Cd Player - Endeavor

Q: Is there more noise on the customers radio?
YES: Check all power and ground connections. If all connections are in
good condition, consult the radio manufacturers service center.
NO: The observed noise is normal.
INSPECTION PROCEDURE 13: Noise is Detected with Engine Running. DIAGNOSIS
CAUTION:
Never connect a noise filter to the high tension
cable (spark plug wire). Spark plug wires
incorporate resistors which have the effect of
suppressing noise. If a spark plug wire is found
to be causing noise, it must be replaced. Confirm that the noise is not from an external
source. Noise prevention should be performed by
suppressing strong sources of noise first.
NOTE: Voltage surges can be induced in the electrical system by
the collapse of a field (i.e. When power is removed from the
coil in an A/C compressor clutch). This induced voltage
surge will radiate a Radio Frequency (RF) signal that is
picked up by the audio unit. In the case of the compressor
clutch a "pop" will be heard through the speakers. The
capacitor, installed on this vehicle, will store the excess
voltage and prevent the production of RF noise. This is
because the capacitor will charge and discharge as the
voltage fluctuates. This has the effect of "attracting" noise
and bleeding it to ground without interfering with the
normal flow of current through the system.

2004 Mitsubishi Endeavor LS
2004 BODY & ACCESSORIES Radio With Tape Player & Cd Player - Endeavor

Fig. 138: Diagnostic Procedure Chart

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

2004 Mitsubishi Endeavor LS
2004 BODY & ACCESSORIES Radio With Tape Player & Cd Player - Endeavor

Fig. 139: Identifying Ground Cable

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

2004 Mitsubishi Endeavor LS
2004 BODY & ACCESSORIES Radio With Tape Player & Cd Player - Endeavor

Fig. 140: Identifying Noise Capacitor (1 Of 2)

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

2004 Mitsubishi Endeavor LS
2004 BODY & ACCESSORIES Radio With Tape Player & Cd Player - Endeavor

Fig. 141: Identifying Noise Capacitor (2 Of 2)

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
INSPECTION PROCEDURE 14: Noise Appears During Vibration or Shocks. DIAGNOSIS
STEP 1. Check the fit of the mast antenna.
Q: Is the mast antenna base fitted securely?
YES: Go to Step 2.
NO: Install the mast antenna, and tighten the mounting nut (Refer to
INSTALLATION SERVICE POINTS
). Check that there is no noise.
STEP 2. Check the fit of antenna feeder cable.
Q: Is the antenna feeder cable fitted securely?

2004 Mitsubishi Endeavor LS
2004 BODY & ACCESSORIES Radio With Tape Player & Cd Player - Endeavor

YES: Go to Step 3.
NO: Ensure that the antenna base and the radio and CD player are fitted
securely. Check that there is no noise.
STEP 3. Check radio and CD player connector C-105 or radio, CD player
and CD changer connector C-105, C-110, C-113 and amplifier connector
C-11, C-12 for loose, corroded or damaged terminals, or terminals pushed
back in the connector.

2004 Mitsubishi Endeavor LS
2004 BODY & ACCESSORIES Radio With Tape Player & Cd Player - Endeavor