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Fault code 4: Diagnosis/troubleshooting

DIAGNOSIS/TROUBLESHOOTING CHART (FAULT CODE 4) - PARKASSISTANT

Work instruction Display OK If not OK
1 Visual inspection
  • Check the outside sensor on the left for external damage.
  • Check the sensor plug for damage and corrosion.
 Step 2 Replace outside sensor on the left or repair sensor plug.
-> End
2 Check supply voltage of the sensor
  • Switch off ignition.
  • Pull plug off the outside sensor on the left.
  • Switch on ignition.
  • Engage reverse gear.
  • Measure voltage between pin 3 of the sensor plug and ground.
 Approx. 8 V
Step 3		 Step 4
3 Check ground lead of the sensor
  • Measure voltage between pins 3 and 2 of the sensor plug.
 Approx. 8 V
Step 8		 Step 7
4 Check sensor supply lead for short circuit to ground
  • Switch off ignition.
  • Pull off all sensor plugs.
  • Pull plug off the control module for ParkAssist.
  • Measure resistance between plug I pin 5 on the control module for ParkAssist and ground.
 Step 5 Repair wiring harness.
-> End
5 Check sensor supply lead for short circuit to B+
  • Switch on ignition.
  • Measure voltage between plug I pin 5 on the control module for ParkAssist and ground.
 0 V
Step 6		 Repair wiring harness.
-> End
6 Check supply lead for open circuit
  • Switch off ignition.
  • Measure resistance between plug I pin 5 on the control module for ParkAssist and pin 3 of plug on the outer left sensor.
 < 5
Step 12		 Repair wiring harness.
-> End
7 Check ground lead of the sensor for open circuit
  • Measure resistance between plug I pin 7 on the control module for ParkAssist and pin 2 of plug on the outer left sensor.
 < 5
Step 12		 Repair wiring harness.
-> End
8 Check signal lead of sensor for short circuit to ground
  • Switch off ignition.
  • Pull plug off the control module for ParkAssist.
  • Measure resistance between plug I pin 4 on the control module for ParkAssist and ground.
  • Measure resistance between plug I pin 4 and pin 7 on the control module for ParkAssist.
 Step 9 Repair wiring harness.
-> End
9 Check signal lead of sensor for short circuit to B+
  • Switch on ignition.
  • Measure voltage between plug I pin 1 on the control module for ParkAssist and ground.
 0 V
Step 10		 Repair wiring harness.
-> End
10 Check signal lead of the sensor for open circuit
  • Switch off ignition.
  • Measure resistance between plug I pin 1 on the control module for ParkAssist and pin 1 of plug on the outer left sensor.
 < 5
Step 11		 Repair wiring harness.
-> End
11
  • Replace outside sensor on left
 -> End
12
  • Replace control module for ParkAssist
 -> End
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