Multiplex Wake-up Mode Test

From the Sleep Mode, wake-up the multiplex system by performing one of the following operations:

OPERATION SPECIFICATION

Operation	Method used for wake up
Cycle ignition switch ON (II)	All multiplex units wake up simultaneously (regardless of ability to communicate)
Turn combination light switch to parking light position	Multiplex control unit wakes up the other units via communication lines.
Open the driver's door	Multiplex control unit wakes up the other units via communication lines.

As the system shifts to its Wake-up (Active) Mode, communication wire voltage will return to 4-10 V and the battery terminal current will return to 70-80 mA.
If the system does not go into Sleep Mode or Wake-up Mode properly, perform the Multiplex Control Unit Input Test (see MULTIPLEX CONTROL UNIT INPUT TEST ).
NOTE: If multiple circuits fail to respond in the Mode 2 tests and/or the multiplex circuit fails to go into Sleep Mode or Wake-up Mode, it may mean that a control unit failed without triggering a DTC in Mode 1. Perform the Multiplex Control Unit Input Test (see MULTIPLEX CONTROL UNIT INPUT TEST ).

If the input test confirms that all the inputs are working properly, substitute a known-good multiplex control unit, gauge assembly or ECM/PCM, one at a time. If the system works properly after swapping one of the above components, replace the original component.