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DSM / B3918 08

Read the instructions below then start the fault diagnostic procedure.

Symptom: Seat operation button, faulty function.

  B3918 08


Switch Tilt Backward Circuit, Signal Invalid

Fault symptom

Seat operation button, faulty function.

On-board diagnosis

Type of diagnosis:

Continuous

Enable criteria:

When seat operation is permitted.

Fault criteria:

The "Tilt rear" button is stuck (activated more than 60 s.) or the "Tilt forward" and "Tilt rear" buttons are activated simultaneously.

System reaction to a fault:

The button is considered inactive until it is released and activated again.

Checking the wiring harness

Move the wiring harness at several spots and in several directions to reveal intermittent breaks and short-circuits. Check switches, connectors and crimp connections for oxidation, retracted pins and pin clamping force.

Diagnostic help

Diagnosis regards:

Electrical fault in connecting leads or component.

Functions in the diagnostic tool related to the fault:

Test value:
Switch, Tilt Rearward
Switch, Tilt Forward
(See also description of readings/activations in diagnostic tool)