I had to remov a Parrot CLK3100 kit which was pretty shabby and suffering buttons that didn't always work.  I decided to replace it and the factory issue Sony with an Xtrons Android 8.1 Head unit which is meant to be plug and play on a 2008 Mondy.   This comes with a CanBus box and wiring harness to attach to the factory ISO connector.   Having removed the parrot, I connected the Sony up and it worked fine.  Plugged the Xtron unit it and it refused to power up.  I have tried with the ignition off, position and 1 and position 2.    I notice the following:

• The supplied xtron harness has two connectors for ACC, one goes to the canbus box and other other to headunit directly,  only one of these can be connected to the the cars wiring harness.  Similarly I have two wires tagged Key A and Key b, but only one can be connected at once.   I have tried different combinations and nothing works.
• The Parrot had been wired to the hazard warning lights, I assume as this provides power when the ignition is off.  I cut the wire at the point where it had been spliced into the parrot harness so as to be able to remove said harness from the car.
• I noticed an earlier thread on this forum where the chap was connecting a Kenwood up and couldn't get it to power on until  until he released there was no switched live.  I am wondering if I have the same issue with the Xtron unit.

For the avoidance of doubt, the Sony is back in the car as I write this and working perfectly so I know the issue has to be with the Xtron or the supplied harness.

Thoughts gratefully rec'd.

2 minutes ago, FreeFocus said:

I had to remov a Parrot CLK3100 kit which was pretty shabby and suffering buttons that didn't always work.  I decided to replace it and the factory issue Sony with an Xtrons Android 8.1 Head unit which is meant to be plug and play on a 2008 Mondy.   This comes with a CanBus box and wiring harness to attach to the factory ISO connector.   Having removed the parrot, I connected the Sony up and it worked fine.  Plugged the Xtron unit it and it refused to power up.  I have tried with the ignition off, position and 1 and position 2.    I notice the following:

• The supplied xtron harness has two connectors for ACC, one goes to the canbus box and other other to headunit directly,  only one of these can be connected to the the cars wiring harness.  Similarly I have two wires tagged Key A and Key b, but only one can be connected at once.   I have tried different combinations and nothing works.
• The Parrot had been wired to the hazard warning lights, I assume as this provides power when the ignition is off.  I cut the wire at the point where it had been spliced into the parrot harness so as to be able to remove said harness from the car.
• I noticed an earlier thread on this forum where the chap was connecting a Kenwood up and couldn't get it to power on until  until he released there was no switched live.  I am wondering if I have the same issue with the Xtron unit.

For the avoidance of doubt, the Sony is back in the car as I write this and working perfectly so I know the issue has to be with the Xtron or the supplied harness.

Thoughts gratefully rec'd.

You really could do with a cheap multimeter so you can work out which is earth/negative, which is ACC and which is permanent live.  I can't remember which ACC connector I ended up plugging into the canbus box.  If you're not up a running by tomorrow I'll pull mine out and take some pictures which should hopefully help.