Secondary air motor caused electrical problems

[vfwjed]

2000 e53 4.4i 118Kmiles


I have an electrical problem I believe was caused by the Secondary air intake motor failure. This morning it was 27 degrees F, so the secondary air came on. Note, the secondary motor was whining / whistling prior to this, but I ignored it up till now…. Note to self, never ignore issues….
Something electrical now has a bad burned smell. It is hard to tell exactly where the smell is coming from but it either the alternator (regulator?) or the Secondary motor itself.
Following the cold start this morning and after the secondary air kicked in, the X5 threw a “trans program failure”. It is safe to assume that this chain reaction was most likely due to the low voltage caused by the high current draw bulling down the battery voltage. Trans did not like that…
For now, I pulled the 50 amp fuse (it was not blown) to the Secondary Air Motor and I recharged the battery.
I also disconnected the B+ from battery for 15 minutes prior to recharging to clear any computer errors.
The dilemma I have now is that I cannot get the starter solenoid to engage at all (no start/turnover)
The peak SR300 reader is showing E10 and E11 codes.
Will a “trans error” cause the whole system to lock out? How can I clear this to get the X5 restarted to continue troubleshooting?
Other suggestions welcome.
Thanks jd

[vfwjed]

Problem resolved: I was wrong in the initial diagnosis. The failure was the Electric Thermostat Heater on the water pump housing. The heating element was toasted, nothing left but carbon dust and a strong burnt electronics smell. In the process of the heater melt down, it blew the Engine Electronic Fuse (F1) 30 amp in the E-Box. This fuse also powers the Transmission Computer, the ECM, and crank sensor. The heater connector boot was slightly damaged too.
Another interesting aspect of this chain reaction was:
First, the engine temperature gauge was pegged to the highest temperature.
Second, the activation of immobilization of the vehicle (no crack/start). To clear the no start/crack, I used the Key lock and unlock. This seemed to resynchronize the computers to start the engine.
I used INPA and GTS to do some resets, replaced the Water Pump and Thermostat assembly.
Was then able to start the X5 started with EMC F1 blown: Was able to retrieve codes:
· F6 Crankshaft Sensor
· 8C Map Controlled Thermostat
on cluster console had:
Engine Failsafe
Transmission …
Troubleshot to the fuse, replaced fuse EMC F1 and then thankfully the X5 came back to life.

[electricalserv x5]

wow now you got me worried about my water pump,it,s a little noise also,it,s in the body shop [pumper was hit at a stop sign],it going to get that water pump done ASAP.