RC300
6th September, 2021, 10:46 AM
Hi,
I have trouble with BCM2 8K0907064DP.
With ignition off, the J329 relay (T32d/16 grey plug) is exercised every couple of minutes, for no reason (car locked or not).
This draws about 6A/4A and the battery dies after a night of more.
J329 is driven by BTS3110N (ground power switch) that does not look to be faulty.
The IN voltage (logic input pin 1) is floating at about 2V that makes the power switch ON.
The floating voltage does not come from the relay coil.
Tying the input to GND through a 1K resistor seems to make things better, as the voltage is below the threshold voltage (1.7V).
But this is consistent.
For some reason, BCM2 is periodically exercising this power switch.
I think more about an electrical problem (output circuit, leak current), I didn't manage to find yet who drives the power switch (70F3381 ?).
My best plan would be to find a used BCM2 and swap the 95320 (at risk) to make it short.
Any comment about the potential scenario that could happen in this BCM2 is welcome.
I have trouble with BCM2 8K0907064DP.
With ignition off, the J329 relay (T32d/16 grey plug) is exercised every couple of minutes, for no reason (car locked or not).
This draws about 6A/4A and the battery dies after a night of more.
J329 is driven by BTS3110N (ground power switch) that does not look to be faulty.
The IN voltage (logic input pin 1) is floating at about 2V that makes the power switch ON.
The floating voltage does not come from the relay coil.
Tying the input to GND through a 1K resistor seems to make things better, as the voltage is below the threshold voltage (1.7V).
But this is consistent.
For some reason, BCM2 is periodically exercising this power switch.
I think more about an electrical problem (output circuit, leak current), I didn't manage to find yet who drives the power switch (70F3381 ?).
My best plan would be to find a used BCM2 and swap the 95320 (at risk) to make it short.
Any comment about the potential scenario that could happen in this BCM2 is welcome.