Poor Reception/Interference On The Radio-Poor Ground (91-053)

DIAGNOSIS 1 - POOR RECEPTION

1. Turn the ignition switch ON; then turn the radio on to extend the antenna mast.
2. Measure the resistance between the top section and the bottom section of the antenna mast (See Fig 1 ).
   Fig 1: Measuring Resistance Between Antenna Sections

   
   • If the resistance is more than 10 ohms, go to CORRECTIVE ACTION, Antenna Mast Replacement.
   • If the resistance is less than 10 ohms, continue with step 3.
3. Disconnect the coaxial cable from the antenna.
4. Measure the resistance between the top section of the antenna and the center pin of the antenna male plug (See Fig 2 ).
   Fig 2: Checking Resistance Between Top Section and Plug Center Pin

   
   • If the resistance is less than 10 ohms, go to Coaxial Cable Test.
   • If the resistance is more than 10 ohms, continue with step 5.
5. Remove the antenna mast nut with the special tool; then remove the antenna mast (See Fig 3 ).
   Fig 3: Removing Antenna Mast Nut

   
6. Measure the resistance between the center pin of the antenna male plug and the threaded portion of the antenna tube (See Fig 4 ).
   Fig 4: Checking Center Plug Pin/Threaded Antenna Resistance

   
   • If the resistance is less than 10 ohms, go to CORRECTIVE ACTION, Antenna Mast Replacement.
   • If the resistance is more than 10 ohms, go to CORRECTIVE ACTION, Antenna Tube Replacement.

DIAGNOSIS 2 - ELECTRICAL NOISE OR INTERFERENCE

1. Disconnect the coaxial cable from the antenna.
2. Measure the resistance between the antenna collar and body ground (See Fig 5 ).
   Fig 5: Measuring Antenna Collar/Body Ground Resistance

   
   • If the resistance is more than 1 ohm, go to CORRECTIVE ACTION, Antenna Collar Replacemnent.
   • If the resistance is less than 1 ohm, continue with step 3.
3. Measure the resistance between the antenna tube and the outside contact of the antenna jack (See Fig 6 ).
   Fig 6: Measuring Antenna Tube/Antenna Jack Contact Resistance

   
   • If the resistance is more than 1 ohm, go to CORRECTIVE ACTION, Antenna Tube Replacement.
   • If the resistance is less than 1 ohm, continue with Coaxial Cable Test.

COAXIAL CABLE TEST

1. Test drive the car to verify the customer's description of the symptom.
   • If the symptom cannot be reproduced, contact the customer for more information regarding the symptom.
   • If the symptom can be reproduced, continue with step 2.
2. Disconnect the power antenna coaxial cable from the power antenna and from the radio.
3. Install a substitute coaxial cable (P/N 39159-SD4-A04) to the antenna; then run the substitute cable on the outside of the car, and connect it to the radio (See Fig 7 ).
   Fig 7: Substituting Coaxial Cable

   
   NOTE: When substituting the coaxial cable on a 1994-95 Integra, be sure to plug the substitute cable directly into the back of the radio. Do not connect the substitute cable into the short coaxial cable that connects the rear coaxial to the radio; that could give you a faulty test result.
4. Test the radio.
   • If the symptom has gone away, install a new coaxial cable.
   • It the symptom persists, the problem is not with the antenna system. Disconnect the substitute cable, reconnect the original coaxial cable, and continue troubleshooting the audio system.

ANTENNA MAST REPLACEMENT

1. Remove the antenna nut with the special tool (See Fig 8 ).
   Fig 8: Removing Antenna Nut

   
2. Inspect the outer diameter of the antenna nut (See Fig 9 ).
   Fig 9: Inspecting Antenna Nut

   
   • If the antenna nut does not have an O-ring around the outer diameter, go to Antenna Mast Kit Replacement.
   • If the nut has an O-ring around the outer diameter, continue with step 3.
3. Turn the ignition switch ON; then turn the radio on to extend the antenna mast.
4. Pull the antenna mast out of the antenna tube (See Fig 10 ).
   Fig 10: Removing Antenna Mast

   
5. Insert the new antenna mast assembly into the antenna tube; then turn the radio off to retract the antenna mast.
6. Loose the antenna motor mounting nut(s) (See Fig 11 ).
   Fig 11: Loosening Antenna Motor Mounting Nut(s)

   
7. Reinstall the antenna nut, and tighten it to 2.3 N.m (0.23 kg.m, 20 lb-in). (See Fig 12 )
   Fig 12: Tightening Antenna Motor Mounting Nuts

   
8. Tighten the antenna motor mounting nut(s).

ANTENNA MAST KIT REPLACEMENT

The Antenna Mast Kit includes the mast, an improved antenna nut (O-ring type), and an insulator that provides a seat for the O-ring.

1. Turn the ignition switch ON; then turn the radio on to extend the antenna mast.
2. Pull the antenna mast out of the antenna tube; then discard the antenna mast.
3. Remove the antenna seal, and discard it (See Fig 13 ).
   Fig 13: Removing Antenna Seal

   
4. Insert the new antenna mast into the antenna tube; then turn the radio off to retract the antenna mast (See Fig 14 ).
   Fig 14: Installing New Antenna Mast

   
5. Loosen the antenna motor mounting nut(s). (See Fig 15 )
   Fig 15: Loosening Antenna Motor Mounting Nuts

   
6. Reinstall the antenna nut, and tighten it to 2.3 N.m (0.23 kg.m, 20 lb-in). (See Fig 16 )
   Fig 16: Reinstalling Antenna Nut

   
7. Tighten the antenna motor mounting nut(s).

ANTENNA TUBE REPLACEMENT (DISASSEMBLY)

1. Remove the antenna nut with the special tool (See Fig 17 ).
   Fig 17: Removing Antenna Nut

   
2. Inspect the antenna nut (See Fig 18 )
   Fig 18: Inspecting Antenna Nut

   
   • If the antenna nut has an O-ring, do not install an antenna seal in the replacement collar.
   • If the antenna nut does not have an O-ring, you must install an antenna seal in the replacement collar.
3. Turn the ignition switch ON; then turn the radio on to extend the antenna mast.
4. Remove the antenna mast from the antenna tube, and retain the mast (See Fig 19 ).
   Fig 19: Removing Antenna Mast

   
5. Disconnect the coaxial cable, the power connector, and the drain tube from the antenna assembly. Loosen the antenna motor mounting nut(s); then remove the antenna assembly from the car (See Fig 20 ).
   Fig 20: Removing Antenna Assembly

   
6. Remove the connector holder (if applicable) and the clamping screw that holds the antenna tube to the antenna assembly. Pull the antenna tube out of the antenna assembly (See Fig 21 ).
   Fig 21: Removing Antenna Tube from Assembly

   
7. Remove the guide and the insulator tube from the old antenna tube. Thoroughly clean the guide and the insulator tube with contact cleaner to remove any dirt and grease (See Fig 22 ).
   Fig 22: Clean Components of Antenna Tube

   
8. Clean the antenna assembly drain tube with compressed air. Make sure that the tube is clear of dirt and grease (See Fig 23 ).
   Fig 23: Clean Assembly Drain Tube

   
9. Remove the screws and nuts holding the grounding strap to the antenna motor assembly; then discard the grounding strap. Using a small wire brush, clean the area on the motor housing where the grounding strap contacts the motor (See Fig 24 ).
   Fig 24: Clean Grounding Strap Contact

   
10. Install the new screws, nuts, and grounding strap provided with the replacement tube.
11. Install the cleaned insulator tube and guide into the replacement antenna tube.

ANTENNA TUBE REPLACEMENT (INSTALLATION)

1. Inspect the replacement antenna tube (See Fig 25 ).
   Fig 25: Inspect Antenna Tubes for Alignment Marks

   
   • If the replacement antenna tube has an alignment mark, go to step 18.
   • If the replacement antenna tube does not have an alignment mark, continue with step 13.
2. Insert the new antenna tube without an alignment mark into the antenna assembly. Install the clamping screw removed in step 6 into the antenna assembly, but do not tighten the clamping screw at this time (See Fig 26 ).
   Fig 26: Install Antenna into Assembly

   
3. Temporarily install the antenna assembly in the car. Adjust the antenna tube so that the collar fits the contour of the body (See Fig 27 ).
   Fig 27: Install Assembly into Car

   
4. With the antenna tube properly adjusted, mark the tube and the antenna assembly with a felt-tip marker to note the alignment (See Fig 27 ).
5. Remove the antenna assembly from the car.
6. Check the alignment of the antenna tube to the antenna assembly; then tighten the clamping screw. Once you have clamped the tube in place, go to step 19.
7. Insert the antenna tube with an alignment mark into the antenna assembly. Align the mark on the antenna tube with the clamping screw hole on the antenna assembly; then secure the tube with the clamping screw removed in step 6 (See Fig 28 ).
   Fig 28: Install Antenna Tube into Assembly

   
8. If applicable, install the connector holder onto the antenna tube as shown, and tighten the screw (See Fig 29 ).
   Fig 29: Install Connector Holder onto Tube

   
9. If the antenna nut did not have an O-ring on it, install a new collar seal into the antenna collar.
10. Install the antenna assembly into the car, but do not tighten the antenna motor mounting nut(s) at this time (See Fig 30 ).
    Fig 30: Install Antenna Assembly

    
11. Connect the power connector, the coaxial cable, and the drain tube to the antenna assembly.
12. Insert the antenna mast into the antenna tube; then turn the radio off to retract the antenna mast.
13. Reinstall the antenna nut; then tighten it to specified torque using the special tool and a torque wrench (See Fig 31 ).
    • 1990-93 Integra: 2.0 N.m (0.20 kg.m, 17 lb-in)
    • 1994-95 Integra: 2.3 N.m (0.23 kg.m, 20 lb-in)
    • 1992-94 Vigor: 2.3 N.m (0.23 kg.m, 20 lb-in)
      Fig 31: Reinstall Antenna Nut

      
14. Tighten the antenna motor mounting nut(s).

ANTENNA COLLAR REPLACEMENT

1. Remove the antenna nut with the special tool (See Fig 32 ).
   Fig 32: Removing Antenna Nut

   
2. Inspect the antenna nut (See Fig 33 ).
   Fig 33: Inspecting Antenna Nut

   
   • If the antenna nut has an O-ring, do not install an antenna seal in the replacement collar
   • If the antenna nut does not have an O-ring, you must install an antenna seal in the replacement collar.
3. Disconnect the coaxial cable, the power connector, and the drain tube from the antenna assembly. Loosen the antenna motor mounting nut(s); then remove the antenna assembly from the car (See Fig 34 ).
   Fig 34: Removing Antenna Assembly

   
4. Remove and discard the antenna collar (See Fig 35 ).
   Fig 35: Replacing Antenna Collar

   
5. Install the new antenna collar onto the antenna tube (See Fig 35 ).
6. If the antenna nut did not have an O-ring on it, install a new collar seal into the antenna collar.
7. Install the antenna assembly into the car, but do not tighten the antenna motor mounting nut(s) at this time.
8. Connect the power connector, the coaxial cable, and the drain tube to the antenna assembly.
9. Reinstall the antenna nut; then tighten it to specified torque using the special tool and a torque wrench (See Fig 36 ).
   • 1990-93 Integra: 2.0 N.m (0.20 kg.m, 17 lb-in)
   • 1994-95 Integra: 2.3 N.m (0.23 kg.m, 20 lb-in)
   • 1992-94 Vigor: 2.3 N.m (0.23 kg.m, 20 lb-in)
     Fig 36: Reinstalling Antenna Nut

     
10. Tighten the antenna motor mounting nut(s).

IN WARRANTY

The normal warranty applies.

OUT OF WARRANTY

Any repair performed after warranty expiration may be eligible for goodwill consideration by the District Technical Manager or your Zone Office. You must request consideration, and get a decision, before starting work.

Failed P/N: Use the part number of the part that failed.

Defect Code: Select the appropriate defect code:

018 - Broken or chipped, in two or more pieces

030 - Binding or sticking

068 - Open or burned-out circuit

Contention Code: F99