Sleep and Wake-up Mode Test
- Shift to the sleep mode:
Turn the ignition switch OFF, and remove the key. If the control unit receives no signals from the inputs listed, it will go into sleep mode in less than 40 seconds.
INPUTS LISTMultiplex Control Unit No. 10 (7.5 A) under-dash fuse Headlight switch (parking lights position OFF) Driver's door switch (door closed) Passenger's door switches (doors closed) Hatch latch switch (hatch closed) Tailgate latch switch (tailgate closed) - Confirm the sleep mode:
- Measure voltage on the YEL or WHT/GRN wires.
- There should be battery voltage in the sleep mode. Check the parasitic draw at the battery while shifting into the sleep mode. Amperage should change from about 200 mA to less than 35 mA.
- Shift to the wake up mode:
When the ignition switch is turned ON (II), the multiplex control unit, gauge control module, and ECM/PCM wake up at the same time without "talking" to each other through the communication lines. When any switch in the multiplex system is turned on, it wakes up its related control unit which, in turn, wakes up the other units.
After confirming the sleep mode, look in the following table for the switch most closely related to the problem. Operate that switch and see if its control unit wakes up.
NOTE: If any control unit is faulty and will not wake up, several circuits in the system will malfunction at the same time. In the table, the control unit is followed by a list of the switches and input signals that can wake it up.LIST OF SWITCHES AND INPUT SIGNALSMultiplex Control Unit No. 10 (7.5 A) under-dash fuse Communication lines (ECM/PCM, keyless receiver unit, and gauge control module) Headlight switch (parking lights position ON) Driver's door switch (door open) Ignition key cylinder switch (key inserted or removed) Ignition switch (ON (II) position)