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Home >> Volvo >> 2006 >> C70 L5-2.5L Turbo VIN 68 B5254T3 >> Repair and Diagnosis >> Accessories and Optional Equipment >> Navigation System >> Testing and Inspection >> Symptom Related Diagnostic Procedures >> Checking the Loudspeakers and Loudspeaker Wiring

Checking the Loudspeakers and Loudspeaker Wiring






Checking the loudspeakers and loudspeaker wiring

Fault-tracing information

Hint: Check that the volume is not turned down. Turn the VOLUME knob on the climate control module (CCM). Also check that the balance is set evenly between all the speakers using the SELECTOR knob.

The loudspeakers may stop playing back sound from a particular sound source, for example the MD and CD players or the radio.
Causes of the problem may be:
- Open-circuit in the signal cable between the audio module (AUD) and the loudspeaker
- Damaged loudspeaker
- Oxidation in the terminal pins in the connectors
- Problems with the MOST network
- Defective control module.

Hint: If there is no sound from any of the loudspeakers, check that the 16-pin connector on the audio module (AUD) is correctly connected. If there is still no sound from the loudspeakers, the problem is not in the loudspeaker wiring.

Select an alternative
1. Loudspeakers front/center
2. Loudspeakers rear.

Which loudspeakers are not working?

1 - front/center loudspeakers

2 - rear doors

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Checking the loudspeaker wiring, rear doors




- Ignition off
- Disconnect the 16-pin connector for the audio module (AUD)
- Disconnect the connectors for the rear loudspeakers.

Hint: There may be two speakers connected to these signal lines, one to the treble speaker and one to the rear speaker. For further information, see the wiring diagram.

Checking the cable
Check the cable terminals on the loudspeaker cable. Check for contact resistance, loose connections and oxidation. Check the cable terminals in the female and male sections of the connector. The cable terminals must not be damaged or pressed back.

Checking lead to speaker, left side rear
Check the lead between Audio module (AUD) #B12 and speaker #1 left side rear for open circuit.
Check the lead between Audio module (AUD) #B4 and speaker #2 left side rear for open circuit.
Check the resistance between terminals #B4 and #B12 in the connector for the audio module (AUD). The resistance must be infinite.

Checking lead to speaker, right side rear
Check the lead between Audio module (AUD) #B13 and speaker #1 right side rear for open circuit.
Check the lead between Audio module (AUD) #B5 and speaker #2 right side rear for open circuit.
Check the resistance between terminals #B5 and #B13 in the connector for the audio module (AUD). The resistance must be infinite.
Remedy as necessary.

Other information
- Connecting the breakout box Connecting the Breakout Box, Audio Module (AUD)
- Audio Module Audio Module
- Microphone telephone Microphone Telephone
- Checking wiring and terminals Checking Wiring and Terminals





Continue - rear door

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Checking the loudspeakers, rear door




- Ignition off
- Disconnect the 16-pin connector for the audio module (AUD)
- Disconnect the connectors for the rear loudspeakers.

Hint: There may be two speakers connected to the same signal line, one to the treble speaker and one to the rear speaker. For further information, see the wiring diagram.

Note! Take readings for the treble loudspeaker on the two signal cables which are directly connected to the cone transducer. See the illustration. Take readings between points 1 and 2.

Checking the cable
Check the cable terminals on the loudspeaker cable. Check for contact resistance, loose connections and oxidation. Check the cable terminals in the female and male sections of the connector. The cable terminals must not be damaged or pressed back

Checking speaker, left side rear
Check the resistance between loudspeaker terminals #1 and #2. The resistance must be approximately 2-8 ohms.
Check the resistance of the treble loudspeaker. See the illustration. Take readings between points 1 and 2. The resistance must be approximately 6-8 ohms.

Checking speaker, right side rear
Check the resistance between loudspeaker terminals #1 and #2. The resistance must be approximately 2-8 ohms.
Check the resistance of the treble loudspeaker. See the illustration. Take readings between points 1 and 2. The resistance must be approximately 6-8 ohms.
Remedy as necessary.

Other information
- Connecting the breakout box Connecting the Breakout Box, Audio Module (AUD)
- Audio Module Audio Module
- Microphone telephone Microphone Telephone
- Checking wiring and terminals Checking Wiring and Terminals









Was a fault detected?

Yes - Verification

No - No Fault Found

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Checking the cable, front/center loudspeakers




- Ignition off
- Disconnect the 16-pin connector for the audio module (AUD)
- Disconnect the connectors for the front loudspeakers
- Disconnect the connector for the center loudspeaker if it is connected.

Note! Only some audio systems have center loudspeakers connected. If the center loudspeaker is not connected do not perform fault-tracing for the center loudspeaker.

Hint: There may be two speakers connected to the same signal line, one to the treble speaker/upper speaker and one to the speaker in the door.

Checking the cable
Check the cable terminals on the loudspeaker cable. Check for contact resistance, loose connections and oxidation. Check the cable terminals in the female and male sections of the connector. The cable terminals must not be damaged or pressed back.

Checking lead to speaker, left door
Check the lead between Audio module (AUD) #B9 and speaker #1 in left door for open circuit.
Check the lead between Audio module (AUD) #B1 and speaker #2 in left door for open circuit.
Check the resistance between terminals #B1 and #B9 in the connector for the audio module (AUD). The resistance must be infinite.

Checking lead to speaker, right door
Check the lead between Audio module (AUD) #B3 and speaker #2 in right door for open circuit.
Check the lead between Audio module (AUD) #B11 and speaker #1 in right door for open circuit.
Check the resistance between terminals #B3 and #B11 in the connector for the audio module (AUD). The resistance must be infinite.

Checking the cable for the center loudspeaker
Check the cable between audio module (AUD) terminal #B2 and center speaker terminal #2 on the dashboard. Check for an open-circuit.
Check the cable between audio module (AUD) terminal #B10 and center speaker terminal #1 on the dashboard. Check for an open-circuit.
Check the resistance between terminals #B2 and #B10 in the connector for the audio module (AUD). The resistance must be infinite.
Remedy as necessary

Other information
- Connecting the breakout box Connecting the Breakout Box, Audio Module (AUD)
- Audio Module Audio Module
- Microphone telephone Microphone Telephone
- Loudspeaker, dashboard Loudspeaker, Dashboard
- Checking wiring and terminals Checking Wiring and Terminals





Continue - front/center loudspeakers

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Checking the cable, front/center loudspeakers




- Ignition off
- Disconnect the 16-pin connector for the audio module (AUD)
- Disconnect the connector for the center loudspeaker.

Note! Take readings for the treble loudspeaker in the center loudspeaker bracket on the two signal cables which are directly connected to the treble cone transducer. See the illustration. Take readings between points 1 and 2.

Checking the cable
Check the cable terminals on the loudspeaker cable. Check for contact resistance, loose connections and oxidation. Check the cable terminals in the female and male sections of the connector. The cable terminals must not be damaged or pressed back.

Checking the center speaker
Check the resistance between terminals #1 and #2 on the center speaker. The resistance must be approximately 5-8 ohms.
Check the resistance in the treble transducer for the center speaker. See the illustration. Take readings between points 1 and 2. The resistance must be approximately 6-8 ohms.
Remedy as necessary.

Other information
- Connecting the breakout box Connecting the Breakout Box, Audio Module (AUD)
- Audio Module Audio Module
- Loudspeaker, dashboard Loudspeaker, Dashboard
- Checking wiring and terminals Checking Wiring and Terminals









Continue - front/center loudspeakers

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Verification




Verification

Hint: After carrying out the repair, check that the fault has been remedied.




- Ignition on
- Switch on the radio or CD/MD player.
Raise and lower the volume using the VOLUME knob. Check that the sound increases and decreases in the loudspeakers at the same time.

Is there sound?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFICATION FAILED - Fault-tracing information

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Fault-tracing information




Information

Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Do you want to exit fault-tracing?

Yes - Exit Fault-Tracing

No - Attempt New Test

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Attempt New Test - Fault-tracing information

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Checking the cable, front/center loudspeakers




- Ignition off
- Disconnect the 16-pin connector for the audio module (AUD)
- Disconnect the connectors for the front loudspeakers.

Hint: There may be two speakers connected to the same signal line, one to the treble speaker/upper speaker and one to the speaker in the door. For further information, see the wiring diagram.

Caution! Check the treble loudspeaker/upper loudspeaker visually only. Check for oxidation and loose connections. Do not carry out any electrical fault-tracing on the treble loudspeaker.

Note! Certain loudspeakers may have two separate cone transducers. For these speakers, follow the troubleshooting for both speakers and speaker elements left and right door. For other speakers, only troubleshoot speaker left and right door.

Checking the cable
Check the cable terminals on the loudspeaker cable. Check for contact resistance, loose connections and oxidation. Check the cable terminals in the female and male sections of the connector. The cable terminals must not be damaged or pressed back.

Checking speaker, left door
Check the resistance between the speaker's #1 and #2 in the left door. Resistance shall be approx. 2-4 ohms.

Checking upper speaker element, left door
Check the resistance between the connections to the upper speaker element in the left door, see figure. Measure between point 1 and 2. Resistance shall be approx. 3-5 ohms.

Checking the loudspeaker, right front door
Check the resistance between the speaker's #1 and #2 in the right door. Resistance shall be approx. 2-4 ohms.

Checking upper speaker element, right door.
Check the resistance between the connections to the upper speaker element in the right door, see figure. Measure between point 1 and 2. Resistance shall be approx. 3-5 ohms.
Remedy as necessary

Other information
- Connecting the breakout box Connecting the Breakout Box, Audio Module (AUD)
- Audio Module Audio Module
- Microphone telephone Microphone Telephone
- Checking wiring and terminals Checking Wiring and Terminals









Was a fault detected?

Yes - Verification

No - No Fault Found

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