connect the power control module to the motor-generator.
These three cables are normally routed under the floor
pan on the inside of the rocker panel. The three high-
voltage power cables have orange insulation to warn
technicians of their danger.
Large eye-type connectors are soldered to each end
of the power cables. This allows the cables to be bolted to
the power control module and to the motor-generator
assembly.
Hybrid Ground Fault Interrupter
A hybrid ground fault interrupter constantly moni-
tors the system for high-voltage leakage into the metal
chassis of the vehicle. If high voltage from the battery
pack or motor-generator is shorting to frame ground, the
ECU will illuminate a warning light and de-energize the
main power relays (contactors) to disconnect the HV bat-
tery pack from its drive circuit.
706 Section 5 Electrical Systems
Figure 38-16. Note how the battery relays operate the large electrical contactors. The relays and contactors work in conjunction to
disconnect battery pack energy from the electric drive train. Note that the DVOM shows no voltage to the power control module until
the relays close the contactors.
Volts
DC
0.0
+ –
+
–
3
3
1
2
5
4
Electric
motor-
generator
Power
control
module
Ground
fault
monitor
Contactor
relays closed
(relays off)
12-Volt
Battery
Volts
DC
274
+ –
+
–
Electric
motor-
generator
Power
control
module
Ground
fault
monitor
Contactor
relays closed
(relays on)
12-Volt
Battery
HV Battery
HV Battery
3-phase AC DC voltage
High Voltage Safety System—Vehicle Shut Off (Ready off)
High Voltage Safety System—Vehicle On and Operational (Ready on)
Contactor
open
Contactor
closed