Fault code 5520: Diagnosis/troubleshooting

DIAGNOSIS/TROUBLESHOOTING CHART - FAULT CODE 5520

Work instruction			Display OK	If not OK
1	Check CAN bus between DME control module and Tiptronic control module for short circuit to voltage	Switch off ignition Pull off DME control module plug and Tiptronic control module plug Switch on ignition Measure voltage between Tiptronic control module plug pin L and ground	< 0.3 V Step 2	Short circuit to voltage in the CAN wiring harness between Tiptronic control module plug pin L and DME control module plug pin B3 -> End
2	Check CAN bus between DME control module and Tiptronic control module for short circuit to voltage	Measure voltage between Tiptronic control module plug pin H and ground	< 0.3 V Step 3	Short circuit to voltage in the CAN wiring harness between Tiptronic control module plug pin H and DME control module plug pin B4 -> End
3	Check CAN bus between DME control module and Tiptronic control module for short circuit to ground	Switch off ignition Measure resistance between Tiptronic control module plug pin H and ground	Step 4	Short circuit to ground in the CAN wiring harness between Tiptronic control module plug pin H and DME control module plug pin B4
4	Check CAN bus between DME control module and Tiptronic control module for short circuit to ground	Measure resistance between Tiptronic control module plug pin L and ground	Step 5	Short circuit to ground in the CAN wiring harness between Tiptronic control module plug pin L and DME control module plug pin B3
5	Check CAN bus between DME control module and Tiptronic control module for short circuit	Measure resistance between Tiptronic control module plug pin H and pin L	Step 6	Short circuit in the CAN wiring harness between Tiptronic control module plug pin H and pin L and DME control module plug pin B3 and B4 -> End
6	Check CAN bus between DME control module, instrument cluster, PSM control module and PSM steering-angle sensor for short circuit to voltage	Pull off the following plugs: PSM control module plug, PSM steering-angle sensor plug and instrument cluster control module plug Switch on ignition Measure voltage between DME control module plug pin D36 and ground	< 0.3 V Step 7	Short circuit to voltage in CAN wiring harness between DME control module plug pin D36, instrument cluster plug pin A15, PSM control module plug pin A24 and PSM steering-angle plug pin A2 -> End
7	Check CAN bus between DME control module, instrument cluster, PSM control module and PSM steering-angle sensor for short circuit to voltage	Measure voltage between DME control module plug pin D37 and ground	< 0.3 V Step 8	Short circuit to voltage in CAN wiring harness between DME control module plug pin D37, instrument cluster plug pin A31, PSM control module plug pin A40 and PSM steering-angle plug pin A1 -> End
8	Check CAN bus between DME control module, instrument cluster, PSM control module and PSM steering-angle sensor for short circuit to ground	Switch off ignition Measure resistance between DME control module plug pin D37 and ground	Step 9	Short circuit to ground in CAN wiring harness between DME control module plug pin D37, instrument cluster plug pin A31, PSM control module plug pin A40 and PSM steering-angle plug pin A1 -> End
9	Check CAN bus between DME control module, instrument cluster, PSM control module and PSM steering-angle sensor for short circuit to ground	Measure resistance between DME control module plug pin D36 and ground	Step 10	Short circuit to ground in CAN wiring harness between DME control module plug pin D36, instrument cluster plug pin A15, PSM control module plug pin A24 and PSM steering-angle plug pin A2 -> End
10	Check CAN bus between DME control module, instrument cluster, PSM control module and PSM steering-angle sensor for short circuit	Measure resistance between DME control module plug pin D36 and DME control module plug pin D37	Step 11	Short circuit in CAN wiring harness -> End
11	Check control units	Push on all control module plugs Disconnect the control modules one after the other and check whether the "CAN data bus (drive)" fault has been remedied	Replace the last control module to be disconnected -> End