Repair manual GRAMMER seat suspension MSG95EAC – November 2012
Material no. 1 277 338
2.3 Troubleshooting – Locating the fault
Page 2 of 15
2 Inspection of the sensor module
Preconditions for fault diagnosis:
• See “Preconditions for fault diagnosis for each test”.
• Upper seat part removed at the seat suspension and put aside.
• The air hose to the sensor module has been inspected with regard to kinks, scoring and tightness and found to be OK.
Step
no.
Inspect/operate Result/Specified status Troubleshooting
2.1 Apply load to the seat suspension. Air escapes at the retaining ring of the quick
coupling of the sensor module. The air hose is not
connected correctly.
No air escaped at the retaining ring of the quick
coupling.
Plug the air hose completely into the
retaining ring of the quick coupling (see
Chapter 3.9).
Proceed with inspection step no. 2.2.
2.2 Apply load to the seat suspension. Air escapes at the sensor module.
The sensor module is airtight.
Replace the sensor module
(see Chapter 3.9).
Proceed with inspection step no. 2.3.
2.3 • Disconnect the electrical connection (C) between the control / air
reservoir and the cable harness for seat suspension.
Measuring instructions: Connect the negative line from the
ohmmeter to K11.
• Measure the resistance at the contacts K11 and K14 in the
socket of the cable harness of the seat suspension (STVB C):
K11 (ground) Ω K14 (signal)
= 20 MΩ (±
±±
± 1%)
Proceed with inspection step no. 2.4.
>> 20 MΩ (R → ∞) (interruption) or
<< 20 MΩ (R → 0) (short-circuit)
Proceed with inspection step no. 2.5.
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