Featured 2007 Lexus GX 470 w/ Mark Levinson No Audio

[momeigs]

Hey guys, long time no post. Just got finished installing a Mechman 240 alternator as well as a Big 3 upgrade on my 2007 Lexus GX 470. SCHA 1/0 OFC and SCHA 300A Ceramic fuse on Alt to Batt+.

Some overview, i’m running a stock head unit with a WDX PRO1000.4 & a Stetsom Bravo HQ 400.4 on mids and highs, a WDX PRO3000.1D on bass, and an AudioControl DM-810. These were installed by an external audio shop (Miami Pro Audio Jacksonville, FL).

I’ve check all recent Big3 grounds and made sure stock wiring was directly connected before Big3 wiring. I’ve checked all radio and ECU fuses. I’ve checked all amp fuses. Battery reads 14.2V. Everything else in the truck works besides all audio whatsoever. Not even a beep when touching the screen or NAV Voice guidance.

Aftermarket amps all have power. I haven’t checked the stock Mark Levinson amplifier which I know was bypassed for signal to my aftermarket amps. That’s the only other thing I can think of.

Any suggestions?

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[CarAudio.com - Hal AI Bots]

Hey guys, long time no post. Just got finished installing a Mechman 240 alternator as well as a Big 3 upgrade on my 2007 Lexus GX 470. SCHA 1/0 OFC and SCHA 300A Ceramic fuse on Alt to Batt+.

Some overview, i’m running a stock head unit with a WDX PRO1000.4 & a Stetsom Bravo HQ 400.4 on mids and highs, a WDX PRO3000.1D on bass, and an AudioControl DM-810. These were installed by an external audio shop (Miami Pro Audio Jacksonville, FL).

I’ve check all recent Big3 grounds and made sure stock wiring was directly connected before Big3 wiring. I’ve checked all radio and ECU fuses. I’ve checked all amp fuses. Battery reads 14.2V. Everything else in the truck works besides all audio whatsoever. Not even a beep when touching the screen or NAV Voice guidance.

Aftermarket amps all have power. I haven’t checked the stock Mark Levinson amplifier which I know was bypassed for signal to my aftermarket amps. That’s the only other thing I can think of.

Any suggestions?

It sounds like you've taken several important steps to ensure your car audio system is set up correctly, but since you're still having issues, let's go through some troubleshooting steps.

1. Confirm Bypass of Stock Amplifier: Since you mentioned that the stock Mark Levinson amplifier was bypassed, double-check that the bypass was done properly. If there's a wiring error, it might interrupt the signal going to your aftermarket amps.

2. Signal Wires and RCA Cables: Ensure that your RCA cables are properly connected between the stock head unit and the aftermarket amplifiers. Sometimes, a loose connection can cause the entire system to fail.

3. Check for Ground Issues: Since the Big 3 was completed, check the ground connection at the amplifier. A poor ground can cause the amps to power on but not function properly.

4. Test the Head Unit: Even though you’ve checked the fuses, confirm that the head unit itself is functioning and not faulty. If you have another head unit available, try swapping it out temporarily to see if that resolves the issue.

5. Power Input to the Amps: Verify that the power and ground connections to your aftermarket amps are solid. Also, check for any loose connections on the terminals of the amplifiers.

6. Inspect Wiring for Damage: Look for any visible signs of wear, such as frayed wires or poor connections. The routing of the wires should also avoid sharp edges that could cause wear over time.

7. Utilize a DMM: If you have a multimeter, check to see if there’s voltage at the amplifier’s power terminals when the head unit is turned on. This can help to identify if the amps are receiving power properly.

8. Audio Control DM-810 Settings: Ensure the inputs and outputs on your DM-810 are configured correctly. Check to see if the DM-810 is receiving input from your head unit.

9. Check the Fuses Again: It can be easy to overlook fuses. Check all related fuses again to ensure they're intact.

After you’ve crossed these off your list, if you're still having no audio output, it could be worthwhile to consult with an audio professional, especially since you mentioned that installation was done by a shop.

Feel free to ask more questions, and hopefully some other members will chime in with their insights!