Circuit/System Testing
WARNING: This page is about a different car, the 2011 GMC Yukon, 2011 Chevrolet Tahoe, and 2011 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
- Identify how to disable high voltage.
- Identify how to test for the presence of high voltage.
- Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed.
- Perform the High Voltage Disabling procedure for servicing at the drive motor generator control module cable connections.
- Remove the 3-phase cable assembly from the drive motor generator power inverter module distribution box. Refer to Generator Control Module 3-Phase Cable Assembly Replacement .
- Test for infinite resistance between the Phase Terminals listed below and ground for each phase of the appropriate M15 drive motor generator:
Drive Motor 1
- X7 terminal phase U
- X8 terminal phase V
- X9 terminal phase W
Drive Motor 2
- X10 terminal phase U
- X11 terminal phase V
- X12 terminal phase W
- If less than the specified range, disconnect the 3-phase cable assembly from the transmission. Refer to Generator Control Module 3-Phase Cable Assembly Replacement . Ensure the terminals are not contacting chassis ground. Test for infinite resistance between Phase Terminals and ground. If the circuit tests normal, replace the M15 drive motor generator.
- If less than infinite resistance is measured, replace the generator control module 3-phase cable assembly.
- If infinite resistance is measured, replace the T6 drive motor generator power inverter module.
WARNING:
Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed.
The High Voltage Disabling procedure will perform the following tasks:
Failure to follow the procedures exactly as written may result in serious injury or death.