Macan Circuit Issue (No starter, No Front Wiper)

[Bris]

Having posted this in one community I realised Renntech being referenced a lot in my research so I figured it would be worth raising my question here.  I also appreciate that ICARSOFT is a very low end scan tool however I do think it is telling us some good information.

 

The car is failing to connect with some of the front electronics, most notably the power steering, front windscreen wiper, headlines/aux lights, starter relay.  Then I noticed if I use the jump points in the engine bay she comes to life.  The power steering does not seem to work at all though.

 

Further research shows all these components have a common ground located near the jump points (GP-15).  So, I was just really wondering if anyone knows of any 'weak points' in the system in the front left of the engine bay?   The car has evidently taken a big knock to the front left wheel and I am suspecting dislodged something. 

During my diagnosis I figured I would ping all the systems, and this is what I have found:

U0126
State: Current
Communication with steering wheel electronics control unit (CAN Chassis)

P0480
State Current
Fan control driver

P0481
State Current
Cooling Fan 2 Control Circuit Malfunction

U0428
State Current
Check steering wheel electronic control unit fault memory content

P3088
State Current
Starter Relay 1 or 2 does not close

B10151B
State Current
Battery main switching switch unit, limit value exceeded

C12016
State Current
No communication with front-end electronics control unit

C12097
State Current
Check air conditioner regulator control unit fault memory content

00A230
Warning Transmission temperature too high

c1201E
State Current
No communication with power steering control unit

008456
State Current
LIN bus 2 - short circuit to ground, short circuit to B+ or open circuit

C120976
State Current
Check A/C control unit fault memory content

C13002
State Current
Communication with generator

C1201E
State Current
Communication with Servotronic control unit

C13201
State Current
Communication with Wiper

86030B
Relay terminal 50, open circuit

U112300
State Current
Check power steering control unit fault memory content

U112100
State current
Communication with Servotronik control unit
 

[Loren]

It would be helpful if you state the exact model and year.

 

When I see that many electrical faults I think battery - battery connections including grounds.

[SpawnyWhippet]

Did you find the cause of the error B10151B Battery main switching switch unit, limit value exceeded? I saw your other post on the Macan forum and have a similar issue. My project 2016 Macan S was rebuilt using the wiring harness from a wrecked 2017 Macan S. I already replaced the battery negative cable with no change, and the fusible link seems to be OK on the positive terminal. I can start the car just fine, but the airbag light will not turn off due to this error code.