2006 LX470 Amplifier Schematics. I am using AI to help me understand and bypass or replace it with an aftermarket amp.
Here is the response from AI.
I went through the three pages you uploaded. The key is that we should treat the factory amp as a junction point: disconnect its speaker outputs and feed the speakers from your aftermarket amplifier/head unit instead.
What the factory Mark Levinson amp is doing
From your schematic, the factory amp connector is
S18(A) / S19(B).
The amplifier has these speaker outputs:
Factory amp channel | Amp connector/pin | Wire color | Goes to |
| FL+ | A-2 | Pink (P) | Front LH door |
| FL− | A-9 | Violet (V) | Front LH door |
| FR+ | A-1 | Light Green (LG) | Front RH door |
| FR− | A-8 | Blue (L) | Front RH door |
| RL+ | A-4 | Black (B) | Rear LH door |
| RL− | A-11 | Yellow (Y) | Rear LH door |
| RR+ | A-3 | Red (R) | Rear RH door |
| RR− | A-10 | White (W) | Rear RH door |
| WFL+ | A-6 | L-W | Woofer |
| WFL− | A-15 | L-Y | Woofer |
| WFR+ | A-5 | L-B | Woofer |
| WFR− | A-14 | L-R | Woofer |
| ML+ | B-2 | L-R | LH center/tweeter circuit |
| ML− | B-15 | L-Y | LH center/tweeter circuit |
| MR+ | B-1 | Y-R | RH center/tweeter circuit |
| MR− | B-14 | Y-G | RH center/tweeter circuit |
The factory amplifier therefore has
8 channels:
Front L/R + Rear L/R + Center/tweeter L/R + Woofer L/R = 8 channels.
The service-manual diagram specifically shows the woofer as a four-wire speaker assembly, with separate
WFL and
WFR amplifier channels. So I would
not treat that woofer as a normal single 2-wire subwoofer.
The easiest bypass for your Android stereo
Since you told me previously that your PX6 Android stereo already has a built-in amplifier, you could do this:
ANDROID HEAD UNIT
│
│ 4 amplified channels
▼
┌───────────────┐
│ │
│ FL+ FL- ├──────────> Factory LH front door
│ FR+ FR- ├──────────> Factory RH front door
│ RL+ RL- ├──────────> Factory LH rear door
│ RR+ RR- ├──────────> Factory RH rear door
│ │
└───────────────┘
FACTORY ML AMP
X
BYPASSED
Specifically, at the
factory amplifier connector, you would connect your Android head unit’s four speaker outputs to these factory speaker wires:
Front Left
Android:
FL+ → Pink P / factory amp A-2
FL− → Violet V / factory amp A-9
Front Right
FR+ → Light Green LG / A-1
FR− → Blue L / A-8
Rear Left
RL+ → Black B / A-4
RL− → Yellow Y / A-11
Rear Right
RR+ → Red R / A-3
RR− → White W / A-10
This would completely eliminate the factory amplifier from those four speaker circuits.
But there is a problem with the center speakers/tweeters
