Grammer MSG95EAC - Page 18

Repair manual GRAMMER seat suspension MSG95EAC – November 2012
Material no. 1 277 338
2.2 Overview of faults – Pointing out possible faults that might occur
Page 4 of 4
Fault description Possible cause Troubleshooting
Seat suspension pumps up and remains in the middle position,
while the compressor is running.
• Sensor module is leaky. Replace the sensor module (see Chapter 3.9).
Seat suspension pumps up automatically (e.g. during
compression and expansion or when getting off the seat);
compressor starts running.
• Short-circuit in the compressor cable (e.g. caused by
abrasion).
• Sensor module is defective.
Check compressor (Chap. 2.3, inspection step
no. 3.1).
Check the sensor module (Chap. 2.3, inspection
step no. 2.3).
After longer operation of the handle for height adjustment in
downward direction when there is no load on the seat (for at
least 6 seconds), no valve switching can be heard.
• Cable harness for seat suspension is defective.
• Seat occupancy detection system is defective.
• Switch for height adjustment is defective.
• Valves in the sensor module are defective.
Check the cable harness for seat suspension
(Chap. 2.3, inspection step no. 5.1).
See Diagnosis in the repair manual for the upper
seat part.
See Diagnosis in the repair manual for the upper
seat part.
Replace the sensor module (see Chapter 3.9).
After having operated the handle for height adjustment in
downward direction when there is no load on the seat, valve
switching can be heard immediately.
• Seat occupancy detection system is defective. See Diagnosis in the repair manual for the upper
seat part
Seat suspension travels up and down and hits the upper and/or
lower end stop.
• Vertical shock absorber is defective.
• Air spring and air distributor are leaky.
• Air hose connections are leaky.
• Air hoses are leaky.
• Sensor module is leaky.
• Active module defective.
Replace the vertical shock absorber (see Chapter.
3.4).
Check the air spring and the air distributor
(Chap. 2.3, inspection step no. 1.1).
Check all air hose connections for air leakage and, if
necessary, replace the defective air hose connection
or seal the leaky connection professionally.
Check all air hoses for air leakage and replace the
defective air hose, if necessary.
Check the sensor module (Chap. 2.3, inspection
step no. 2.1).
Check the active module (Chap. 2.3, inspection step
no. 4.1).