Acura RL. Instruction — page 202

44. Do the self-diagnostic function (see SELF-DIAGNOSTIC FUNCTION ).

45. Press and release the «No. 1» button.

46. Measure the voltage between the active noise control unit 16P connector No. 2 terminal and body

ground.

Fig. 93: Measuring Voltage Between Active Noise Control Unit 16P Connector No. 2 Terminal
And Body Ground

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there about 2.5 V?

YES — Replace the stereo amplifier (see STEREO AMPLIFIER REMOVAL/INSTALLATION ).

NO — Go to step 47.

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

48. Disconnect the active noise control unit 16P connector and stereo amplifier connector C (23P).

49. Check for continuity between the active noise control unit 16P connector and stereo amplifier

connector C (23P).

16P:

No. 1

No. 2

No. 9

No. 10

23P:

No. 16

No. 14

No. 17

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No. 15

Fig. 94: Checking Continuity Between Active Noise Control Unit 16P Connector And Stereo
Amplifier Connector C (23P)

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES — Go to step 50.

NO — Repair open in the wire(s) between the active noise control unit 16P connector and stereo
amplifier connector C (14P).

50. Check for continuity between body ground and active noise control unit 16P connector No. 1, 2,9, and

10 terminals individually.

Fig. 95: Checking Continuity Between Body Ground And Active Noise Control Unit 16P
Connector No. 1, 2,9, And 10 Terminals

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES — Repair short in the wire(s) between the active noise control unit 16P connector and stereo

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amplifier connector C (14P).

NO — Replace the active noise control unit (see ACTIVE NOISE CONTROL UNIT
REMOVAL/INSTALLATION
).

51. Start the engine, and let the vehicle idle.

52. Perform the self-diagnostic function (see SELF-DIAGNOSTIC FUNCTION ).

53. Press the No. 1 button.

Can you hear the low-frequency hum ?

YES — Go to step 54.

NO — The system is OK.

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

55. Disconnect the active noise control unit 16P connector and PCM connector A (31P).

56. Check for continuity between the active noise control unit 16P connector No. 15 terminal and PCM

connector A (31P) No. 23 terminal.

Fig. 96: Checking Continuity Between Active Noise Control Unit 16P Connector No. 15
Terminal And PCM Connector A (31P) No. 23 Terminal

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES — Go to step 57.

NO — Repair open in the wire between the active noise control unit 16P connector No. 15 terminal and
PCM connector A (31P) No. 23 terminal.

57. Check for continuity between the active noise control unit 16P connector No. 15 terminal and body

ground.

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Fig. 97: Checking Continuity Between Active Noise Control Unit 16P Connector No. 15
Terminal And Body Ground

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES — Repair short in the wire between body ground and the active noise control unit 16P connector
No. 15 terminal and PCM connector A (31P) No. 23 terminal.

NO — Replace the PCM.

SOUND QUALITY DIAGNOSIS

Special tools required

Diagnostics CD 07AAZ-SDBA100

Use the following tests to check sound quality.

LEFT/RIGHT CHANNEL ID

Do this test to confirm proper channel routing.

1. Insert the audio diagnostic CD (T/N 07AAZ-SDBA100) into the audio unit.

2. Play track No. 1 (left, both, right channel ID) at a normal, or slightly higher than normal, volume

level.

3. The voice should be audible only from the channel or channels when indicated.

If the channel ID is correct for each side, go to PHASE TEST.

If the channel ID is not correct, check for

Shorted speaker wire

Faulty amplifier

Faulty audio unit

NOTE:

Before beginning the following tests, write down the client’s bass, treble,
fader and balance settings, then set them to their center positions for the
testing.

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