Diagnostic Procedure For the Bus Wiring Harness - II

Diagnostic Procedure For The Bus Wiring Harness







- The cause of the fault is a short circuit in the I-bus+ or I-bus- at some point in the connected wiring harness or internally in a connected control module.







- 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