Section 9. Theory of Operation Toyota

Pinout Matrix

Same as PSI on the steer power head.

Same as PSI on the steer power head.

Same as PSI on the steer power head.

B+ supplied to the warning light, P contactor coil and the Travel Alarm. It comes from the STM through FU1 and is dependant on B+PC at JPT12-1.

Path for the STM to supply B- to the P contactor. There is also an LED (116-5)on the STM that will light when B- is supplied to the coil. Voltages are measured with meter leads on the coil X and Y.

Path for the STM to supply B- to the Travel Alarm. There is also an LED (116-2)on the STM that will light when B- is supplied. Voltages are measured with meter leads on terminals 1 and 2 of travel alarm.

Path for the STM to supply B- to the warning light. There is also an LED (116-1) on the STM that will light when B- is supplied. Voltages are measured with meter leads on terminals 1 and 2 of the light.

B+ supplied to the load holding and lift lower solenoids, PC contactor coil and the brake coil. It comes from the STM through the K1 relay and is dependant on B+F from FU2.

B+ w/PC contactor closed

OV w/PC contactor open

Not activated= 20.5V.

Activated= less than 1 V.

Not activated= 20.5V.

Activated= less than 1 V/

Not activated= 20.5V.

Activated= less than 1 V.

B+ w/EPO closed OV w/EPO open

Path for the STM to supply B- to the L/H solenoid. There is also an LED (116-9)on the STM that will light when B- is supplied to the coil. Voltages are measured with meter leads on solenoid coil 1 and 2.

Not activated= 20.5V.

Activated= less than 1 V.