Instrument Cluster
| Complaint/Problem |
Possible cause |
Remedy/Test step 1) |
| All red segments in the PTS warning indicator (A44/1, A44/3, and A44/4), illuminate at forward speed < approx. 9 mph; no reverse gear selected; no warning sound |
Front sensors dirty; sensors defective; wires shorted or connectors not plugged-in; moisture in sensor connector; wrong sensors installed |
Clean sensors
Read out DTC's  12
23 |
| Reverse gear selected; all red segments in the PTS warning indicator (A44/1, A44/3, and A44/4), illuminate at reverse speed < approx. 9 mph; no reverse gear selected; no warning sound |
Rear sensors dirty; sensors defective; wires shorted or connectors not plugged-in; moisture in sensor connector; wrong sensors installed |
Clean sensors
Read out DTC's 12
23 |
| All red segments in the PTS warning indicator (A44/1, A44/3, and A44/4), illuminate at speed < approx. 9 mph with no warning sound, after approx. 3 min. of interruption warning sound comes on. Interruption depends on place or time. |
Interference in construction zones (pneumatic tools); moisture radiation (car wash); heavy rain, hail; electromagnetic induction (traffic light) |
Switch PTS off manually using PTS on/off switch (S95)
Wait for interference to cease
Read out DTC's 12
23 |
| Ultrasonic PTS control module (N62) does not store any DTC's. |
No voltage supply to control module; no signal from the sensors; sensors defective or control module defective. |
23 |
| PTS system not functioning with ignition on |
Fuses; Ultrasonic PTS control module (N62) |
23 |
| PTS system does not switch-on at speed < approx. 9 mph |
PTS switched off manually; system became inoperative during drive |
Switch PTS on and off manually using PTS on/off switch (S95); check LED in the PTS switch (S95)
23 |
| PTS system does not switch-off at speed > approx. 9 mph |
No VSS signal provided |
23  8 |
| Some segments of the PTS warning indicator (A44/1, A44/3, and A44/4) do not illuminate. |
PTS warning indicator (A44/1, A44/3, and A44/4) defective. |
Replace the PTS warning indicator (A44/1, A44/3, and A44/4). |
| One or more PTS warning indicator (A44/1, A44/3, and A44/4) not functioning. |
No voltage supply to the respective warning indicators. |
23 3
23 4
23 5 |
| After switching the ignition on, the red segments of one or more warning indicator(s) (A44/1, A44/3, and A44/4) illuminate immediately without preceding function check. |
Data lines to the respective warning indicator defective. |
23 3
23 4
23 5 |
| Rear dome lamp warning indicator (A44/3) illuminates always or is always off. |
Reverse signal not correct. |
23 9 |
| Warning indicators to bright with lights on. |
Light signal (circuit 58) not correct. |
23 10 |
| Front warning indicator illuminates with no obstacles in the frontal area. |
System can be triggered by bushes, stones, high curbs, posts, sign etc. |
System OK |
| System interference when wet. |
Connectors to the sensors not plugged correctly; sensors not sealed correctly; harness exposed to moisture. |
Repair as required. |
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