Grammer MSG95EAC - Page 26

Repair manual GRAMMER seat suspension MSG95EAC – November 2012
Material no. 1 277 338
2.3 Troubleshooting – Locating the fault
Page 8 of 15
4 Check the active module
Preconditions for fault diagnosis:
• See “Preconditions for fault diagnosis for each test”.
• The seat suspension is not disconnected (voltage that might cause a current flow must be applied to the seat suspension) and must be levelled.
• The thin air hose and the thick air hose have been inspected with regard to kinks and tightness and found to be OK.
Step
no.
Inspect/operate Result/Specified status Troubleshooting
4.1 Apply load to the seat suspension. Air escapes at the circlip and/or at the quick-
release fastener screw. The air hoses are not
connected correctly.
No air escapes at the circlip and/or at the quick-
release fastener screw.
Plug the air hoses completely and correctly
into the circlip and into the quick-release
fastener screw (see Chapter 3.14).
Proceed with inspection step no. 4.2.
4.2 Apply load to the seat suspension. Air escapes at the active module.
The sensor module is airtight.
Replace the active module
(see Chapter 3.13).
Proceed with inspection step no. 4.3.
4.3 • Disconnect the electrical connection (C) between the control / air
reservoir and the cable harness for seat suspension.
• Measure the resistance at the contacts K10 and K6 in the socket
of the cable harness of the seat suspension (STVB C):
K10 (ground) Ω K6 (voltage 12 V at the
electromagnet for 2/2)
= 8.8 Ω (±
±±
± 10%)
Proceed with inspection step no. 4.4.
>> 8.8 Ω (R → ∞) (interruption) or
<< 8.8 Ω (R → 0) (short-circuit)
Proceed with inspection step no. 4.5.