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CIM / B1440 00

Read the instructions below then start the fault diagnostic procedure.

Symptom: Error message is shown on the display.

  B1440 00


+B Circuit from ISM, Open

Fault symptom

Error message is shown on the display.

On-board diagnosis

Enable criteria:

Ignition ON.

Fault criteria:

Control module receives a faulty signal from ISM (ignition switch).
Signal from the key does not match key position.

System reaction to a fault:


Steering column lock deactivated.

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:

Diagnostic trouble code can be generated with low battery voltage.
Electrical fault in connecting leads or component.

Functions in the diagnostic tool related to the fault:

Test value:
Ignition Key Position +B, Wire from ISM
Ignition Switch +B, K-Line from ISM
(See also description of readings/activations in diagnostic tool)