Defect Code 01

Defect Code 01:

Failure of individual check-control signal generator Systems:

Note!

A complete list of signal generator systems is provided in the - Functional Description.

In compliance with this diagnostic procedure, there is a fault when the signal generator signals a system as being defective although the system is OK in the vehicle or when the system in the vehicle is defective but the signal generator does not detect a fault.

The check-control text display in the instrument cluster is mainly linked to a series of additional conditions (engine speed, vehicle speed, time conditions). The signal generator system should therefore only be checked with the BMW DIAGNOSTIC SYSTEM (display without additional conditions)

Troubleshooting with the diagnostic program - general
- not applicable to oil level switch, EGS, ASC, AHM -

- Disconnect plug connections at signal generator. Connect wire to check control module (CCM) or instrument cluster directly to ground or interrupt. The display should change between "OK" and "not OK". If the display does not change, check wire and repair if necessary. If wire is OK, renew check control module or instrument cluster electronic assembly.
- Using suitable lead, alternately bypass or interrupt Pin 1 and Pin 2 of the plug connection. The display should change between "OK" and "not OK". If the display does not change, the ground connection is defective. Repair wire.
- If the display changes correctly when bypassing Pin 1 and Pin 2, the signal generator is defective.

Troubleshooting engine oil level switch:

- Complete defect detection with BMW DIAGNOSTIC SYSTEM.
- If both sensors (static and dynamic) are displayed as being defective, check ground wire to the 3-pin connector of the oil level switch Pin 2 and repair it necessary.
- Checking engine oil level switch: Detach 3-pin connector. Measure resistance at plug part of oil level switch.

Nominal values:

Between Pin 2 and Pin 3 < 1 Ohm.

Between Pin 2 and Pin 1 = approx. 1 Kilo Ohm

- Renew defective sensor.

Troubleshooting trailer module (AHM):

- Error message although no AHM installed: Check short-circuit jumper at 6-pin connector in luggage compartment (rear left trim), repair if necessary. If jumper is OK, repair wire to CCM connector green Pin 9.
- Trailer module (AHM) installed: Check AHM main fuse in front power distribution box, repair if necessary.
- AHM main fuse OK: Check all light fuses in the AHM and repair defective fuses. Installation location AHM: off of luggage compartment, behind trim panel.
- Fuses OK: Detach 6-pin connector between trailer module (AHM) and vehicle wire harness. Connect jumper between Pin 5 and Pin 6 (wire end vehicle wire harness). If the trailer module (AHM) is now shown as OK, renew trailer module.
- Defect displayed despite bypass: Check ground wire to trailer module (AHM) and check wire to CCM connector green Pin 9, repair if necessary.

Troubleshooting EGS, ASC messages:

- Check EGS (Diagnostic Procedure 2460.0) or ASC (Diagnostic Procedure 3450.1).
- If EGS or ASC OK: Check wire from CCM to control unit and repair if necessary.