Grammer MSG95EAC - Inspection of the Cable Harness for Seat Suspension

Repair manual GRAMMER seat suspension MSG95EAC – November 2012
Material no. 1 277 338
2.3 Troubleshooting – Locating the fault
Page 11 of 15
5 Inspection of the cable harness for seat suspension
Preconditions for fault diagnosis:
• See “Preconditions for fault diagnosis for each test”.
• Upper seat part removed.
• Fuse (Si = 15A) has been inspected and found to be OK.
• Sensor module, active module and compressor have been inspected and found to be OK.
• Disconnect the electrical connection (K) between the connector plug of the vehicle and the cable harness for seat suspension.
Step
no.
Inspect/operate Result/Specified status Troubleshooting
5.1
• Disconnect the electrical connection (C) between the control / air
reservoir and the cable harness for seat suspension.
• Bridge the contacts K10 and K1 in the socket of the cable
harness of the seat suspension (STCB C) (voltage supply for
control):
• Measure the resistance at the pins P1 and P2 at the plug of the
vehicle (STVB K):
P1 (ground) Ω P2 (voltage)
< 1 Ω (R →
→→
→ 0) (pass)
Proceed with inspection step no. 5.2.
>> 1 Ω (R → ∞) (cable break)
Replace the cable harness of the seat
suspension (see Chapter 3.16).
5.2
• Bridge the pins P6 and P8 in the plug of the cable harness for
the seat suspension (STCB J) (pin assignment for the heater).
• Measure the resistance at the pins P3 and P6 at the plug of the
vehicle (STVB K):
P3 (ground) Ω P6 (voltage)
< 1 Ω (R →
→→
→ 0) (pass)
Proceed with inspection step no. 5.3.
>> 1 Ω (R → ∞) (cable break)
Replace the cable harness of the seat
suspension (see Chapter 3.16).