Fault code 9101: Diagnosis/troubleshooting

DIAGNOSIS/TROUBLESHOOTING FAULT CODE 9101

Work instruction			Display OK	If not OK
1	Check CAN bus leads, CAN-high and CAN-low for short circuit.	Switch off ignition Remove plug A from the instrument cluster Remove from the Tiptronic control module (if present) Pull plug off the PSM control module Pull off steering angle sensor plug Pull plug off the DME control module Measure resistance on plug A of the instrument cluster between pin 15 and pin 31 Measure resistance between pin 3 and pin 4 on plug B of the DME control module.	Step 2	Repair wiring harness ->End
2	Check CAN bus lead, CAN-high for short to ground	Measure resistance between plug A on instrument cluster pin 15 and ground Measure resistance between pin 3 and ground on plug b of the DME control module.	Step 3	Repair wiring harness ->End
3	Check CAN bus lead, CAN-low for short to B+	Switch on ignition Measure voltage between plug A on instrument cluster pin 31 and ground Measure voltage between pin 3 and ground on plug b of the DME control module.	0 V Step 4	Repair wiring harness ->End
4	Determine faulty control unit	Switch off ignition Reconnect plugs to all control modules Pull off plugs on the control modules (except instrument cluster) individually, read out the fault memory of the instrument cluster and check whether the fault has been remedied.	The fault is remedied by disconnecting the plug connection of a control module. Step 5	The fault is still present Step 6
Work instruction			Display OK	If not OK
5	Replace the control module which was last disconnected from the CAN bus.		->End
6	Replace instrument cluster		->End