6 Inspection of the belt buckle contact
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 heater has been inspected and found to be OK.
• Belt buckle with belt buckle cable has been inspected and found to be OK.
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
6.1 • Switch off the heater (switch for seat heater to
position "0").
• Snap the belt latch into the belt buckle (no
buzzing).
• Measure the resistance at the contacts in the
plug for vehicle connection (pin assignment for
Actros):
K4 (black) Ω K5 (blue)
≥ 1 Ω (R→ ∞) (interruption)
<< 1 Ω (R→ 0) (short-circuit)
Proceed with inspection
step no. 6.2.
Replace the belt buckle
contact (see Chapter 3.28).
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