9606 Telephone/telematics: Diagnosis/troubleshooting
DIAGNOSIS/TROUBLESHOOTING (9606 TELEPHONE/TELEMATICS)
| Work instruction |
Display OK |
If not OK |
| 1 |
Check CAN comfort leads, CAN comfort (high) and CAN comfort (low) for short circuit |
- Switch off ignition
- Remove plug A from the instrument cluster
- Pull plug off the Tiptronic control unit
- Pull plug off the PSM control unit
- Pull off steering angle sensor plug
- Pull plug off the DME control unit
- 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 unit
|
Step 2 |
Repair wiring harness
-> End |
| 2 |
Check CAN comfort 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 the plug B of the DME control unit
|
Step 3 |
Repair wiring harness
-> End |
| 3 |
Check CAN comfort lead, CAN-low for short circuit to B+ |
- Switch on ignition
- Measure resistance between plug A on instrument cluster pin 31 and ground
- Measure voltage between pin 3 and ground on the plug B on the DME control unit
|
0 V
Step 4 |
Repair wiring harness
-> End |
| 4 |
Determine faulty control unit |
- Switch off ignition
- Reconnect all plugs to control units
- Pull off plugs to the control units (except instrument cluster) individually and 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 unit
Step 5 |
The fault is still present Step 6 |
| 5 |
- Replace the control module that was last disconnected from CAN comfort
|
-> End |
| 6 |
- Replace instrument cluster
|
-> End |