Adjusting Phone Mic Gain?

[cbm8880 Senior Member Find all posts View Profile Close cbm8880]

Hi All,

I have the 6 stacker Toyota stereo in the dash and the bluetooth phone connection sounds like **** to the caller on the other end. I have ruled out other phones and coverage issues, and when I spoke with Toyota, the told me I could adjust the mic gain. There is no reference to this in the manual and they were not very clear on how to do it.
Any ideas?

Cheers!

P.S. As an alternative, am I able to connect an external mic (as opposed to the one in the head unit) and place that up near the drivers head?

[cbm8880 Senior Member Find all posts View Profile Close cbm8880]

Anyone? Anyone?... Bueller?

Im more interested in the external mic option now - has anyone had any experience with this?

Cheers!

[mickmac_42 Senior Member Find all posts View Profile Close mickmac_42]

and when I spoke with Toyota, the told me I could adjust the mic gain.

I would start with these guys. Evidently they know how to adjust the gain.

If you want to replace the mic, try talking to a car sound installer. They may give you some free advice, or not. Either way, you've lost nothing.

Unless you want to replace the head unit, I'll hazard a guess that the solution will involve cutting and splicing wires on the mic-in line.

Mike

[croozr Junior Member Find all posts View Profile Close croozr]

Try this


NEW TSB - How to Adjust Bluetooth Mic Volume
T-SB-0097-09 March 24, 2009
Audio Bluetooth System Outgoing Call Volume
Adjustment
Service
Category
Audio/Visual/Telematics

Section
Cellular Communication Market USA

Applicability
YEAR(S) MODEL(S) ADDITIONAL INFORMATION
2008 – 2009 Avalon, Highlander,
Highlander HV,
Sequoia, Sienna
2007 – 2009 Camry, Camry HV,
RAV4, Solara, Tundra
2009 Matrix, Tacoma, Venza

Introduction
When using the audio bluetooth system some customers may mention that the outgoing call volume
is too low or distorted. Please use the following procedure to adjust the outgoing call volume
to address these conditions.
Warranty Information
OP CODE DESCRIPTION TIME OFP T1 T2
N/A Not Applicable to Warranty – – – –
Repair Procedure
This procedure applies to vehicles equipped with the audio bluetooth system only.
NOTE
For vehicles equipped with the Toyota navigation system, please refer to the Repair Manual
procedures.
NOTE
This entire procedure must be completed within 15 seconds from the time the ignition is turned on
until you press the tune knob on the radio. Vehicle must have a phone previously paired to the
system for this procedure to work.
1. Turn ignition “ON”.

2. Turn radio “OFF”.
3. Turn ignition “OFF”.
4. Turn ignition “ON”, and immediately start pressing the “off hook” button on the steering wheel
until the radio displays the “Not Linked” or phone message.
5. Immediately press the volume controls on the steering wheel: Vol. “UP” - Vol. “DOWN” (3 times).
6. Press the tune knob on the radio once (display should read “Vol Type”).
7. Turn the tune knob on the radio until the display reads “Send” volume, then press tune knob.
NOTE
Only choose “Send” volume, modifying other settings may cause poor performance of the
Bluetooth system.
8. If the customer is mentioning the outgoing call volume is too low, turn the volume knob to the
right to increase outgoing call volume (+3 or +4 are recommended).
9. If the customer is mentioning of distorted or clipping sound in the outgoing call then decrease
outgoing call volume (-2 or -3 are reccommended).
10. If Bluetooth system still has original customer issue after performing the adjustment, diagnose
microphone circuit using the following repair manual instructions found on the Technical
Information System (TIS).

[cbm8880 Senior Member Find all posts View Profile Close cbm8880]

Thanks for that, I'll give it a go - although I don't have steering wheel controls. Hopefully it works!

Cheers.

[Nuffy Lurker Find all posts View Profile Close Nuffy]

How did you go without the steering wheel controls as I'm in the same boat and I can't work it out.

[cbm8880 Senior Member Find all posts View Profile Close cbm8880]

Unfortunately as I have the GX, I don't have steering wheel controls, so I couldn't get it to work... Ideas?