Repair Manual MSG 90.6PG Commercial Vehicles, Omnibuses – November 2017
Material no. 1153450_c
2.4
Fault diagnosis
Page 9 of 16
TABLE OF CONTENTS
4 Inspection of the seat heater (Actros, Atego, Axor, bus seat, Kingman)
Preconditions for fault diagnosis:
• Electrical system of the vehicle has been inspected and found to be OK in compliance with the vehicle operating
instructions.
• Seat cushion is lifted off in position for repair without disconnecting the electrical connections (C) and (D) (Chapter 3.1).
Note:
The components mentioned above are illustrated in Chapter 2.1, if not stated otherwise in this text.
Step
no.
Inspect/operate
Result/specified status
Troubleshooting
4.1a
• Disconnect the electrical connection (A)
between the seat (Actros, Atego, Axor, bus
seat) and the vehicle.
• Turn the heater switch to heating level 2
(high).
ATTENTION
Malfunction!
The heater can only be checked at heating
level 1 below 20 °C.
• Measure the resistance at the contacts in the
plug for vehicle connection (pin assignment for
Actros, Atego, Axor, bus seat):
K3 (red)
Ω
K4 (black)
= 5.32
Ω
(
±
10 %)
(total resistance of
the heater mats at approx. 20 °C)
< 4.78
Ω
or
>> 5.85
Ω
End of inspection.
Proceed with inspection
step 4.2.
