Diagnostic Procedure For the Control Module's Current Supply

Diagnostic Procedure For The Control Module's Current Supply







- See the table in the Technical Data section for the fuses which must be intact and the pins which must have a current supply (+30 and +15 circuits) and ground connection in order for a missing control module to allow diagnostics communication.







- Turn the ignition switch to the ON position.
- Select: All systems/Bus configuration in the diagnostic tool's main menu.

Checking The Wiring Harness
Jiggle the leads and in-line connectors at several places and in different directions to reveal intermittent breaks and short circuits in the wiring harness. Observe the multimeter test lamp or diagnostic tool while doing this.

- The diagnostic instrument shows OK when communication starts.
- If necessary, disconnect one control module at a time to trace a possibly faulty one.
- The potential between bus+ and ground and between bus- and ground should be 2-3 V. All control modules put out this voltage.
- Rectify the fault.

After performing this procedure Final Check