Permanent Power and CANBUS
I have two PDMs and I intended to leave one permanently powered for things like central locking. The second would be powered on a switch along with the ECU.
I'm finding that the can bus doesn't connect properly unless I connect to the permanently powered pdm with the laptop.
Is there any way to get around this issue? I'm assuming that the permanently powered pdm is marking the bus as dead when it can't contact the other devices.
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So I have re-wires the two PDMs and ECU to all turn on simultaneously on a switch, but the front pdm can bus must be running out before the devices in the rear are available.
The ECU and rear PDM establish can Comms, but the front pdm is dark until I resend the config.
I've checked the physical cabling and I get 60ohm with all devices powered off. I can only assume that the issue is on a micro second timing level.
The rear pdm and ECU are both in the boot and are fed by a longer cable run than the front pdm.
Is there any way to delay the start up?