Diagnostic Module (N59) Socket 19:
6 - Idle speed control inoperative
12 - Heated oxygen sensor heater, open/short circuit

LH-SFI Module (N3/1) Socket 4 :
22 - O2S 1 heater, open/short circuit

ABS w/ASR Control module (N30/1) Socket 6 :
13 - Stop Lamp switch (ASD/ASR)
30 - CAN data line to EA/CC/ISC module (N4/1)

EA/CC/ISC Module (N4/1) Socket 7 :
5 - Stop Lamp switch (S9/1)
6 - Starter lock-out/backup lamp switch (S16/3)
14 - Closed throttle position contact switch (S29/3)

Base Module (N16/1) Socket 8 :
5 - Maximum allowable temperature in module box (F23) exceeded

SRS Control module (N2/2) Socket 30:
2 - SRS control module (N2/2)
4 - Front passenger airbag squib (R12/8)
8 - Voltage supply

Ignition Control Module (N1/3) Socket 17:
1 - No Faults in System

I need to find out if there is a systematic procedure to troubleshoot, given the codes shown above.

Thanks

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1999 Porsche 996 Carrera Convertible
1994 420E - SOLD
1986 300E - SOLD, what a car
609 Certified