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DSM / B1770 04

Read the instructions below then start the fault diagnostic procedure.

Symptom: Memory functions not working The seat cannot be adjusted lengthwise.

  B1770 04


Legroom Adjustment Motor. Open Circuit

Fault symptom

Memory functions not working

The seat cannot be adjusted lengthwise.

On-board diagnosis

Type of diagnosis:

Continually when the engine is run.

Enable criteria:

When seat operation is permitted.

Fault criteria:

Motor, Slide Forward

Voltage on the control module output is below 6 ±0.2V.
Motor, Slide Rearward

Voltage on the control module output is below B+ -0.7V.

System reaction to a fault:

No memory functions work

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:

Activate:
Motor, Slide Rearward
Motor, Slide Forward
(See also description of readings/activations in diagnostic tool)