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Fault code 19: Diagnosis/troubleshooting

DIAGNOSIS/TROUBLESHOOTING - FAULT CODE 19

Work instruction Display OK If not OK
1 Visual inspection
  • Check plug 9 on control module for corrosion and contact.
  • Check supply lead on plug 9 for damage.
 Step 2 Connect plug 9 or repair wiring harness.
-> End
2 Check power supply of the sensor
  • Switch off ignition.
  • Pull off plug on lumbar adjustment device (pressure sensor).
  • Measure voltage between pin 1 and ground.
 Approx. 5 VM
Step 3		 Step 5
3 Check ground lead of the sensor
  • Measure voltage on plug of lumbar adjustment device (pressure sensor), between pins 1 and 3.
 Approx. 5 V
Step 4		 Step 8
4 Check signal lead of the sensor
  • Select Pressure sensor voltage in the Actual values menu item.
  • Connect jumper between pins 1 and 2.
 0 V without jumper
Approx. 5 V with jumperM
Step 12		 Step 9
5 Check supply lead of the sensor for short circuit to B+
  • Pull plug 9 off the control module.
  • Switch on ignition.
  • Measure voltage between plug 9 on control module pin 1 and ground.
 0 V
Step 6		 Repair wiring harness.
-> End
6 Check supply lead of the sensor for short circuit to ground
  • Switch off ignition.
  • Measure resistance between plug 9 pins 1 and 3 on the control module.
  • Measure resistance between plug 9 on control module pin 1 and ground.
 Step 7 Repair wiring harness.
-> End
7 Check supply lead of the sensor for open circuit
  • Measure resistance between plug 9 pin 1 on the control module and pin 1 of plug on the lumbar adjustment device (pressure sensor).
 < 5
Step 13		 Repair wiring harness.
-> End
8 Check ground lead of the sensor for open circuit
  • Pull plug 9 off the control module.
  • Measure resistance between plug 9 pin 3 on the control module and pin 3 of plug on the lumbar adjustment device (pressure sensor).
 < 5
Step 13		 Repair wiring harness.
-> End
9 Check signal lead of sensor for short circuit to ground
  • Pull plug 9 off the control module.
  • Measure resistance between plug 9 on control module pin 2 and ground.
  • Measure resistance between plug 9 pins 2 and 3 on the control module.
 Step 10 Repair wiring harness.
-> End
10 Check signal lead of sensor for short circuit to B+
  • Switch on ignition.
  • Measure voltage between plug 9 on the control module pin 2 and ground.
 0 V
Step 11		 Repair wiring harness.
-> End
11 Check signal lead of the sensor for open circuit
  • Switch off ignition.
  • Measure resistance between plug 9 pin 2 on the control module and pin 2 of plug on the lumbar adjustment device (pressure sensor).
 < 5
Step 13		 Repair wiring harness.
-> End
12 Replace lumbar adjustment device -> End
13 Replace control module -> End
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