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2006 Toyota Highlander hybrid audio not working


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HiHy2006
New User

May 28, 2024, 9:13 PM

Post #1 of 7 (693 views)
2006 Toyota Highlander hybrid audio not working Sign In

Hello,

One day sound from the car stereo just disappeared in my wife's car. It is a 2006 Toyota Highlander hybrid, with JBL speakers, and a radio with navigation.

If I set volume to max I can barely hear music. But sometimes suddenly it kicks in and starts to work normally in the middle of a ride, but then stops working spontaneously again sometimes in a few minutes and sometimes longer.

I've tried to move connectors on the back of the radio and on the amplifier in the trunk, to check for a loose connection. Also swapped the amp with an identical one but it didn't help. Can't figure it out.

Could you help me with troubleshooting?

Thanks


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

May 29, 2024, 4:27 AM

Post #2 of 7 (679 views)
Re: 2006 Toyota Highlander hybrid audio not working Sign In

That radio has an external amplifier in the back of the vehicle that may be failing but you would need a technician to do some testing for that.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



HiHy2006
New User

May 29, 2024, 9:51 AM

Post #3 of 7 (670 views)
Re: 2006 Toyota Highlander hybrid audio not working Sign In

I swapped the amp in the trunk with an identical one, but it didn't help. Today tried to swap the radio unit but it didn't help either.

I can test voltages at the amplifier connectors, but I don't know what to look for.
Any suggestions?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

May 29, 2024, 10:03 AM

Post #4 of 7 (668 views)
Re: 2006 Toyota Highlander hybrid audio not working Sign In







~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



HiHy2006
New User

May 29, 2024, 8:31 PM

Post #5 of 7 (646 views)
Re: 2006 Toyota Highlander hybrid audio not working Sign In

Thank you for the wiring diagram.

I've measured different voltages at pins 1 and 2 of the s22 connector of the amplifier in the trunk:

1 Pink (AMP ON): 13.4 V
2 Green (ACC): 14.5 V
Also, the mute pin has a non-zero voltage
12 Brown (MUTE): 4.7 V
Pins 4 and 11 are ~0 V
Pins 5,6,13 and 14 seem to yield small AC voltage, may need to check with headphones for the sound signal

For connector s23:
7 red yellow (+B): 14.4 V
12 white black (PWR GND) 0 V
All other pins have non-zero potential relative to the body (all the voltages above are also measured relative to the body) of about 7 V. But zero voltage between any pair. The resistance of the speakers measured at the connector is 4 ohms.

Could you tell me if any of these readings are out of the expected range?


HiHy2006
New User

Jun 4, 2024, 7:17 AM

Post #6 of 7 (475 views)
Re: 2006 Toyota Highlander hybrid audio not working Sign In

Upd: fixed by removing MUTE pin from the connector. These 4.7 volts on the pin basically switched of the amp output.

There is no mute button for the radio, so I suspect it is implemented somewhere in navigation module to enhance voice prompts.

The only problem with the solution is that now I get loud bum when I turn on the radio.

Please let me know if you know a better solution.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jun 4, 2024, 10:42 AM

Post #7 of 7 (467 views)
Re: 2006 Toyota Highlander hybrid audio not working Sign In

You're probably going to need that mute feature for both navigation and bluetooth phone if you have it.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.







 
 
 






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