Minnesota
I am fighting DTC 281C and 281D
The DME can't communicate via Bit Serial Data to a module. My car is 2003 Z4 2.5i M5425 so I believe it only has 1 BSD module, the voltage regulator mounted on the alternator.
I am getting a steady 14v at the battery regardless of reving the engine. I believe this is the default set point for the voltage regulator when the DME doesn't send it a value.
I have a new battery.
I first tried cleaning the BSD connector that goes to the alternator. That didn't wa work.
Iv then replaced the voltage regulator no luck the code was still there. I read that cheap aftermarket voltage regulators don't talk BSD. After getting sticker shock for what a new Bosch VR costs I decided to buy a brand new Bosch alternator as it comes with a new voltage regulator.
I just installed the new Bosch alternator and no luck the same codes.
I plugged in INPA found the 2 BSD errors, tried clearing them from memory but the error comes back almost immediately.
I am at the point now where I think it might be a broken wire. I want to do a continuity check but I am struggling. I can't seem to see it on any electric drawings.
The closest guess I have is connector X60003 pin 19. It's labeled "GEN" and says it goes to "Charging System" (see attached image)
Does anyone know for sure what DME connector and pin the BSD communication is on?
The DME can't communicate via Bit Serial Data to a module. My car is 2003 Z4 2.5i M5425 so I believe it only has 1 BSD module, the voltage regulator mounted on the alternator.
I am getting a steady 14v at the battery regardless of reving the engine. I believe this is the default set point for the voltage regulator when the DME doesn't send it a value.
I have a new battery.
I first tried cleaning the BSD connector that goes to the alternator. That didn't wa work.
Iv then replaced the voltage regulator no luck the code was still there. I read that cheap aftermarket voltage regulators don't talk BSD. After getting sticker shock for what a new Bosch VR costs I decided to buy a brand new Bosch alternator as it comes with a new voltage regulator.
I just installed the new Bosch alternator and no luck the same codes.
I plugged in INPA found the 2 BSD errors, tried clearing them from memory but the error comes back almost immediately.
I am at the point now where I think it might be a broken wire. I want to do a continuity check but I am struggling. I can't seem to see it on any electric drawings.
The closest guess I have is connector X60003 pin 19. It's labeled "GEN" and says it goes to "Charging System" (see attached image)
Does anyone know for sure what DME connector and pin the BSD communication is on?
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