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?
1. YES : Go to Step 2.
2. NO : Install the mast antenna, and tighten the mounting nut (Refer to SPEAKER ). Check that there is no noise.
STEP 2. Check the fit of antenna feeder cable.
Q: Is the antenna feeder cable fitted securely?
1. YES : Go to Step 3.
2. 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.

Fig 1: Identifying Amplifier Connector C-11, C-12
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Fig 2: Identifying Radio, CD Player And CD Changer Connector C-105, C-110, C-113
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Q: Are 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 in good condition?
1. YES : Go to Step 4.
2. NO : Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION . Check that there is no noise.
STEP 4. Check that noise appears when the radio switch is turned on while the vehicle is stopped and the radio is tapped while tuned away from a station.
NOTE: Body static electricity from the shock absorber rubber bushings used to prevent vibration, tires, etc. occurs because of separation from the ground, causing a buzzing noise. Since no measures can be taken to discharge the static electricity of the vehicle body. Check that there is no noise.

Q: Does noise appear when the radio switch is turned on while the vehicle is stopped and the radio is tapped while tuned away from a station?
1. YES : Go to Step 5.
2. NO : It may be static electricity noise.
STEP 5. Verify that the radio is correctly grounded.
The radio is connected to the ground with an assembling screw.

Q: Is the radio correctly grounded?
1. YES : Go to Step 6.
2. NO : Tighten the screw securely. Check that there is no noise.
STEP 6. Check by replacing radio and CD player.
Q: Do the other radio and CD player work normally?
1. YES : Either repair or replace the original radio and CD player. Check that there is no noise.
2. NO : Either repair or replace the antenna assembly. Check that there is no noise.