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Acura CSX. Manual - part 621

＊５４

＊５５

＊５６

＋

−

YES

23-197

AM/FM ANTENNA AMPLIFIER 3P CONNECTOR

ANT

AM/FM ANTENNA AMPLIFIER 3P CONNECTOR

ANT

NAVIGATION UNIT CONNECTOR G (3P)

AM/FM ANTENNA AMPLIFIER 3P CONNECTOR

ANT

10. Remove the navigation unit (see page 23-355).

Check that the antenna lead is properly connected.

Go to step 11.

Reconnect the connector, and recheck the

function.

11. Disconnect the AM/FM antenna lead 3P connector

from the AM/FM antenna amplifier (see page
23-263).

12. Turn the ignition switch to ON (II).

13. Turn on the navigation unit.

14. Measure the voltage between the AM/FM antenna

lead connector terminal No. 3 at the AM/FM
antenna amplifier and body ground.

Go to step 19.

Go to step 15.

15. Turn the ignition switch to LOCK (0).

16. Disconnect navigation unit connector G (3P).

17. Check for continuity between the AM/FM antenna

amplifier 3P connector terminal No. 3 and body
ground.

Repair short to body ground in the wire

between the navigation unit and the AM/FM
antenna amplifier.

Go to step 18.

18. Check for continuity between navigation unit

connector G (3P) terminal No. 3 and the AM/FM
antenna amplifier 3P connector terminal No. 3.

Substitute a known-good navigation unit

(see page 23-355), and recheck.

Repair open in the wire between the

navigation unit and the AM/FM antenna
amplifier.

Terminal side of female terminals

Is it connected pr oper ly?

Is ther e batter y voltage?

Is ther e continuity?

08/08/21 14:09:51 61SNR030_230_0200

＊５７

＊５８

＊５９

＊６０

−

YES

23-198

Audio System

NAVIGATION UNIT CONNECTOR G (3P)

RF IN

NAVIGATION UNIT CONNECTOR G (3P)

RF SH

RF IN

NAVIGATION UNIT CONNECTOR G (3P)

AM/FM ANTENNA AMPLIFIER 3P CONNECTOR

RF SH

RF IN

NAVIGATION UNIT CONNECTOR G (3P)

AM/FM ANTENNA AMPLIFIER 3P CONNECTOR

RF IN

19. Turn the ignition switch to LOCK (0).

20. Disconnect navigation unit connector G (3P).

21. Check for continuity between navigation unit

connector G (3P) terminal No. 1 and body ground.

Replace the AM/FM antenna lead and/or

sublead.

Go to step 22.

22. Check for continuity between navigation unit

connector G (3P) terminals No. 1 and No. 2.

Replace the antenna lead and/or sublead.

Go to step 23.

23. Check for continuity between navigation unit

connector G (3P) terminal No. 2 and the AM/FM
antenna amplifier 3P connector terminal No. 2.

Replace the antenna lead and/or sublead.

Go to step 24.

24. Check for continuity between navigation unit

connector G (3P) terminal No. 1 and AM/FM
antenna amplifier 3P connector terminal No. 1.

Replace the AM/FM antenna amplifier

(see page 23-263), and recheck. If the reception is
still poor, replace the navigation unit (see page
23-355).

Replace the AM/FM antenna lead and/or

sublead.

Terminal side of female terminals

Is ther e continuity?

08/08/21 14:09:51 61SNR030_230_0201

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ＳＮＲ９ＡＮＫＪ１０３００００００００ＦＡＡＴ０３

−

Poor AM or FM radio reception or
interference (without navigation)

YES

YES
NO

YES

23-199

NOTE:

• Check the vehicle battery condition first.
• Check for aftermarket accessories plugged into the

vehicle accessory power sockets (including cell
phones).

• Check the connectors for poor connections or loose

terminals.

• Check the radio reception in an open area. Compare it

to a known-good vehicle whenever possible. Poor
reception/interference can be caused by the
following:
– The radio station is far away.
– Atmospheric conditions are unfavorable.
– Tall buildings, mountains, or high-voltage power

lines are nearby.

– Aftermarket metallic wi ndow tint.

1. Turn the ignition switch to ON (II).

2. Do the seek stop test (see page 23-255).

Multipath interference or weak station.

Operation is normal.

Go to step 3.

3. Check if the radio reception/interference is the

same in several locations.

Go to step 4.

Multipath interference or weak station.

Operation is normal.

4. Start the engine.

5. Check the reception/interference.

Check the antenna and radio grounds. If OK,

check the charging system and the ignition
system.

Go to step 6.

6. Turn the ignition switch to LOCK (0).

7. Remove the right side C-pillar trim (see page 20-75).

8. Check the connections from the AM/FM antenna

amplifier to the window antenna.

Repair the connections, or substitute a

known-good AM/FM antenna amplifier and retest.
If the symptom/condition goes away, replace the
original AM/FM antenna amplifier (see page
23-263).

Go to step 9.

9. With the help of an assistant inside the vehicle,

have the assistant shine a flashlight (A) along each
antenna wire (B). Check from the outside of the
vehicle for any breaks or openings in the antenna
wires (the light shines through).

Repair the window antenna. Go to AM/FM

antenna repair (see page 23-264), or replace the
rear window (see page 20-47) if the damaged
section is too long.

Go to step 10.

Is the test vehicle within 10 % of the known-good
vehicle?

Is the r eception/ inter f er ence the same?

Is ther e noise ( static or whine) only with the
engine r unning?

Ar e ther e any loose or damaged connections?

Ar e ther e any br eaks or cuts in the antenna?

08/08/21 14:09:52 61SNR030_230_0202

＊０２

＊０３

＊０４

＋

−

YES

23-200

Audio System

AM/FM ANTENNA AMPLIFIER 3P CONNECTOR

ANT

AM/FM ANTENNA AMPLIFIER 3P CONNECTOR

ANT

AUDIO UNIT CONNECTOR G (3P)

AM/FM ANTENNA AMPLIFIER 3P CONNECTOR

ANT

10. Remove the audio unit (see page 23-256). Check

that the antenna lead is properly connected.

Go to step 11.

Reconnect the connector, and recheck the

function.

11. Disconnect the antenna cable 3P connector from

the AM/FM antenna amplifier (see page 23-263).

12. Turn the ignition switch to ON (II).

13. Turn on the audio unit.

14. Measure the voltage between the AM/FM antenna

lead connector terminal No. 3 at the AM/FM
antenna amplifier and body ground.

Go to step 19.

Go to step 15.

15. Turn the ignition switch to LOCK (0).

16. Disconnect audio unit connector G (3P).

17. Check for continuity between the AM/FM antenna

amplifier 3P connector terminal No. 3 and body
ground.

Repair short to body ground in the wire

between the audio unit and the AM/FM antenna
amplifier.

Go to step 18.

18. Check for continuity between audio unit connector

G (3P) terminal No. 3 and the AM/FM antenna
amplifier 3P connector terminal No. 3.

Substitute a known-good audio unit

(see page 23-256), and recheck.

Repair open in the wire between the audio

unit and the AM/FM antenna amplifier.

Terminal side of female terminals

Is it connected pr oper ly?

Is ther e batter y voltage?

Is ther e continuity?

08/08/21 14:09:52 61SNR030_230_0203

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