In another control module a malfunction is indicated:

Check data wires and the respective shield between the different control modules connected to Bus system for break, wiring resistance, or short between wires to either Ground or B+.

Wiring resistance max: 1.5 Ohm

See SYSTEM WIRING DIAGRAMS .

NOTE:

Watch for possible loose contact in the wiring and connectors.
If malfunction is not indicated on all control modules, an interruption to the connecting point in the wiring could be the cause.

If no malfunction is determined and all control modules connected to the Bus system show malfunction, there is a malfunction in one of the other connected control modules.

Separate all control modules except instrument cluster and control module from Bus system.
Erase DTC memory in instrument cluster.
Up to m.y. 1999, see DIAGNOSTIC TROUBLE CODE (DTC) MEMORY, ERASING (SCAN TOOL FUNCTION 05) . For m.y. 2000 and up, see ERASE DTC MEMORY (FUNCTION 05) .
Check DTC memory from instrument cluster.
Up to m.y. 1999, see DIAGNOSTIC TROUBLE CODE (DTC) MEMORY, CHECKING . For m.y. 200 and up, see CHECK DTC MEMORY (FUNCTION 02) .

If malfunction "Data Bus drive faulty" no longer appears, malfunction lies in one of the connected control modules.

Connect in sequence the different control modules again.
Check DTC memory after connecting each control module.
Replace control module if malfunction " Data Bus drive faulty" is indicated again.

If the malfunction "Databus drive faulty" appears again there is a malfunction in the instrument cluster or engine control module.

Disconnect engine control module and connect control head -E87-.
Check DTC memory from instrument cluster again.

NOTE: By disconnecting the engine control module and connecting A/C control head -E87-, a faulty control module can be detected.

Check DTC memory from control module with -E87- for which data can not be exchanged.
Should the control module not be able exchange data with other control modules, one other or additional malfunction has been stored; eliminate this malfunction before testing the Bus wiring system.
Check part number with respective Index of control module where communication is not possible.

NOTE:

If there is a malfunction in the control module, data exchange with other control modules may be interrupted, although this malfunction does not directly affect the Can-Bus.
Different control modules are designed beginning with a specific part number for communication in the Can-Bus.
Interruptions in the voltage supply or in the Ground connection to one control module connected to the Can-Bus could lead to storage of this malfunction.

Check data wires and the respective shield between the different control modules connected to Bus system for break or wiring resistance.
Wiring resistance max: 1.5 Ohm

SeeSYSTEM WIRING DIAGRAMS .
Check voltage supply to different control modules connected to the Can-Bus for break or wiring resistance.

NOTE:

Watch for possible loose contact in the wiring and connectors.
This malfunction is only indicated by the control module, which awaits a specific telegram from another control module and can not evaluate it or recognize it.

If no malfunction is determined and this malfunction is also stored on another control module.

First replace control module to which other control modules can not communicate.