2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1253
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Special Tools
* EL-48458 HV Precharge Tester
* EL-48569 Terminal Covers
* EL-48900 HEV Safety Kit
Circuit/System Verification
1. Verify that DTC P1A20 or P1AE7 is not set, and that no drive motor generator control module DTCs are set.
瀚慖f any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code
Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle).
2. Ignition ON, observe the scan tool Hybrid Battery 11 parameter. The reading should be between 10-19 V.
Circuit/System Testing
Danger: 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:
* 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.
Before working on any high voltage system, be sure to wear the following Personal Protection Equipment:
* Safety glasses with appropriate side shields when within 50 feet of the vehicle, either indoors or outdoors.
* Certified and up-to-date Class "0" Insulation gloves rated at 1000V with leather protectors.
- Visually and functionally inspect the gloves before use.
- Wear the Insulation gloves at all times when working with the high voltage battery assembly, whether the system is energized or
not.
Failure to follow the procedures exactly as written may result in serious injury or death.
1. Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling ().
2. Connect the 12 V battery.
3. Ignition ON, verify the scan tool, drive motor generator battery High Voltage Interlock Status parameter displays failed.
瀚慖f not the specified value and the manual disconnect is removed, refer to DTC P1AE2-P1AE4, P1B05, or P1B06 (See: P Code
Charts/P1AE2).
4. Connect the EL-48458 at the drive motor generator battery assembly. Refer to the EL-48458 installation procedure located in High Voltage
System Diagnosis (EL-48458) ().
Note: Install a manual disconnect lever with a verified good fuse or a new manual disconnect lever.
5. Install the manual disconnect lever.
6. Ignition ON, precharge the high voltage system by moving the high voltage contactor relay switch on the tester to the closed position. Verify
that the Hi-voltage greater than 60 V LED illuminates and stays illuminated. Wait 3 minutes. Verify the high voltage 125 A fuse does not
open and that the precharge does not fail.
瀚慖f the fuse opened or the precharge failed, test the internal battery assembly high voltage cables for a short to ground or an open/high
