Has anyone done a CarPlay retrofit / Headunit replacement for 991.1
#2806
Rennlist Member
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Yup I checked if it was still enabled. I needed to pull the Fuse for PCM to fully reset the CANBUS unit. As it's attached via constant 12v and requires a hard reset after the update. It worked after I did this.
#2807
Burning Brakes
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Hello everyone,
I did the CHSTEK install, and I am getting no sound. I have carplay working, but both the radio and apple music don't output any sound to the speakers. At first I thought it was because I did not have the small connector from the harness plugged in from the picture below, but then I plugged it in since the guide showed it plugged in, but still no sound. Any ideas what I can check? Again my car does not have Bose as far as I know, although I am not 100% sure how to check.
any ideas welcome as this is beyond frustrating!
I did the CHSTEK install, and I am getting no sound. I have carplay working, but both the radio and apple music don't output any sound to the speakers. At first I thought it was because I did not have the small connector from the harness plugged in from the picture below, but then I plugged it in since the guide showed it plugged in, but still no sound. Any ideas what I can check? Again my car does not have Bose as far as I know, although I am not 100% sure how to check.
any ideas welcome as this is beyond frustrating!
![](https://cimg2.ibsrv.net/gimg/rennlist.com-vbulletin/232x199/19_05_2024_09_59_10_6e377d84c7ab4906ed799656b784a3c827fb865a.png)
Last edited by ZedZed; 05-19-2024 at 06:00 AM.
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sletcher (05-19-2024)
#2808
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That's really odd (I didn't have these issues) but I'm glad you've got it working.
#2810
Rennlist Member
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I'm adding it to the latest draft now
@Joec500 My Chstek is still in its box so I can't validate this, but the Canbus box power connector (2 white white/black wires) goes to the Head unit for its power, so pulling the quadlock should cut the power to the HU and to the Canbox? Just trying to see if there's a simpler reset procedure that might be easier for some people comparered to pulling a fuse?
@Joec500 My Chstek is still in its box so I can't validate this, but the Canbus box power connector (2 white white/black wires) goes to the Head unit for its power, so pulling the quadlock should cut the power to the HU and to the Canbox? Just trying to see if there's a simpler reset procedure that might be easier for some people comparered to pulling a fuse?
#2811
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Just a quick question. Most of the installations thus far have been BOSE/MOST configurations. Has there been a successful “Base” installation yet? We have one member that’s having difficulty getting any sound from his base stereo.
Last edited by sletcher; 05-19-2024 at 07:55 AM.
#2812
#2813
Rennlist Member
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So I have a non Bose setup and have it working fine with an Erisin unit. My Chstek is sitting in the box waiting for me to install it. I'll update here but I doubt it'll be this weekend
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sletcher (05-19-2024)
#2814
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And Thank you to everyone for their contributions and expertise. Great thread and community.
#2815
Instructor
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Yes, definitely don't have bose, Thanks for checking! So I'm not near the car, but I had this thought in the middle of the night that I never connect the harness that has all the RCA outs for an amplifier to the unit. Maybe that needs to be there and possibly the harness for the quad connector has some RCA ins? I'm going to see if that is the case later today.
#2816
Rennlist Member
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In theory the quadlock connector outputs the sound to the non Bose amplifier. That's how the Erisin works, but it's worth trying what you suggest...
#2817
Rennlist Member
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I'm adding it to the latest draft now
@Joec500 My Chstek is still in its box so I can't validate this, but the Canbus box power connector (2 white white/black wires) goes to the Head unit for its power, so pulling the quadlock should cut the power to the HU and to the Canbox? Just trying to see if there's a simpler reset procedure that might be easier for some people comparered to pulling a fuse?
@Joec500 My Chstek is still in its box so I can't validate this, but the Canbus box power connector (2 white white/black wires) goes to the Head unit for its power, so pulling the quadlock should cut the power to the HU and to the Canbox? Just trying to see if there's a simpler reset procedure that might be easier for some people comparered to pulling a fuse?
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sletcher (05-19-2024)
#2818
Burning Brakes
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Here's the pinout diagram for the PCM 3.1:
![](https://cimg4.ibsrv.net/gimg/rennlist.com-vbulletin/756x613/19_05_2024_17_36_32_7acbbed97625bf2f991790877643d3ab04616a5b.png)
I assume that in the Erisin unit the pins indicated above for front and rear speaker outputs are replicated? One would also assume that the CHSTEK followed suit? Pin 16 needs to be wired on the CHSTEK to wake up the amp. If it isn't, then any switched (red) 12V+ ACC wire will do the same job.
@andy2111 will soon find out when he installs his CHSTEK unit.
Not sure if any of this post is relevant, but it might spark an idea in someone.
Last edited by ZedZed; 05-19-2024 at 01:43 PM.
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sletcher (05-19-2024)
#2819
Instructor
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#2820
Burning Brakes
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Needs to be other way around - audio OUT from the HU. But on non-Bose units the speaker connections are in the quadlock (see diagram above). The FL/FR, RL/RR outputs go directly to the amplifier. I am wondering if your amp has received the wake-up signal? Do you know where the amp is? Often under the passenger seat. If you can access it and you have a DMM or a 12v probe you could perhaps check to see if it has power?