Codes on 2005 RR HSE...

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I shelled out $240 for RSW All Comms III. Plugget it in and got following codes that are shown below as screenshots.

Question I have - where can I get description of RR error codes, as well as what causes them?

Here is the list

1. BCU (Body Contol Unit) - the computer that is under passenger seat:

Now, I am going to remove the BCU and send it for repair. This repair supposed to fix all these codes that also cause other problemes, like unable to unlock rear doors and/or tailgate, stiff steering, etc.

2. Engine Control Module:

I was told that these error are caused by failed mass air flow sensor - engine is getting more fuel that it is needed and the result is also poor fuel economy. In addition to mass air flow senser I am also planning to replace power steeing and all fuids - trasfer case, transmission, front and read diff, coolant, engine oil, break fluid.

3. Instrument pack

I know nothing about these errors. What causes these?

5. Steering Interlock Module. Again, I don't know what these errors are about and what are fixes:

6. Transfer Box Module - same, looking for info about these codes
Battery Undervoltage (0x512)
Noise on actuatur signal (0x5223)
INSTR3 lost from CAN (0x52F2)


Update
I did clear all item fault codes - these that communicate (details below). Most codes got cleared, however some remained.

Following codes remained:

M62 Petrol Engine Module Communications.
Retrieving ECU ID Information.
Returned ECU ID : B8 : F7 : 12 : 8 : E0 : 3 : 5A : DE : 5A : EE : 0 : 0 : 86 :
Misfire detected cylinder 8.
Misfire detected cylinder 6.
Multiple misfire fault.
CAN bus missing node - Instrument Pack.

Body Control Module Communications.
Retrieving ECU ID Information
Returned ECU ID : 0 : 10 : A0 : DA : E0 : 3 : 9A : 25 : 10 : 85 : 13 : 30 : 4 : 6 : 32 : B0 :
ECU Part Number : 010A0DA
ECU Hardware Number : E.0
ECU Code Index : 03
ECU Diag Index : 9A
ECU Bus Index : 25
Week of Manufacture : 10
Year of Manufacture : 85
Software Version : 3.0
Servo-valve or connections open circuit
Servo-valve or connections short circuit

Right Headlight Module Communications. Note: worked only on 3rd-4th try to open:
Retrieving ECU ID Information.
Returned ECU ID : 98 : 10 : A0 : 88 : 38 : 14 : 63 : 40 : 0 : 1 : 10 : 43 : 15 : 8 : 11 : F1 :
Ignition voltage < 7.5 volts.
D2S/R-Light is off.


Following items could not be opened for diagnostics - the all got the same ERROR : Connection FAILED message

Digital Signal Processor Communications.
Retrieving ECU ID Information.
ERROR : Connection FAILED...
ERROR : Comms Offline, Please Try Again.

Headlight Leveling Module Communications.
Retrieving ECU ID Information.
ERROR : Connection FAILED...
ERROR : Comms Offline, Please Try Again.

Left Headlight Module Communications.
Retrieving ECU ID Information.
ERROR : Connection FAILED...
ERROR : Comms Offline, Please Try Again.

Lighting Control Module Communications.
Retrieving ECU Fault Information
ERROR : Connection FAILED...
ERROR : Comms Offline, Please Try Again.

Satellite Navigation Module Communications.
Retrieving ECU ID Information.
ERROR : Connection FAILED...
ERROR : Comms Offline, Please Try Again.

Rain Sensor Module Communications.
Retrieving ECU ID Information.
ERROR : Connection FAILED...
ERROR : Comms Offline, Please Try Again.

Tire Pressure Module Communications.
Retrieving ECU ID Information.
ERROR : Connection FAILED...
ERROR : Comms Offline, Please Try Again.

The following unites did not get error messages after clearing all fault codes

5HP24 Transmission Module Communications.
Transfer Box Module Communications.
Engine Immobilizer Module Communications.
Steering Angle Sensor Module Communications.
Steering Column Interlock Module Communications.
Air Bag Restraint Module Communications.
Seat Control Module Communications.
Parking Assist Module Communications.


My questions:
1. How much time should I wait to re-check if codes came back?
2. What needs to be done to open communication with items that give ERROR message?