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.
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