B1785 04

B1785 04

Backrest Motor. Open Circuit







Fault symptom
- Memory functions not working

On-board diagnosis

Type of diagnosis:
- Continually when the engine is run.

Enable criteria:
- When seat operation is permitted.

Fault criteria:
- Motor, Seat Back Forward
Voltage on the control module output is below 6 ± 0.2V.

- Motor, Seat Back Rearward
Voltage on the control module output is below B ± 0.7V.

System reaction to a fault:
- No memory functions work
- Output is switched off, tries however to activate the engine once each time the ignition is switched on.

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, Seat Back Forward
- Motor, Seat Back Rearward
(See also description of readings/activations in diagnostic tool)