2010 Cadillac Truck Escalade ESV AWD V8-6.2L Page 1562
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
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 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.
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. Disconnect the air conditioning control module terminal X4 B+ (300 V) and terminal X5 ground (300 V).
3. Test for infinite resistance between the terminals listed below and ground;
* X4 B+ (300 V) cable
* X5 ground (300 V) cable
锟斤拷If less than the specified value, replace the air conditioning control module assembly.
4. Test for greater than 50k ohm between the B+ (300 V) terminals X4 and ground (300 V) X5.
锟斤拷If less than the specified range, test the circuits for a short between the circuits. If the circuits test normal, replace the air conditioning
control module assembly.
5. Connect the EL-48458 at the drive motor generator power inverter module. 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.
6. Install the manual disconnect lever.
7. Connect the 12 V battery.
8. Ignition ON, attempt to 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 does not illuminate.
锟斤拷If the LED illuminates, replace the drive motor generator power inverter module.
Note: The following tests require wearing personal protection equipment (PPE) gloves.
9. Ignition OFF, remove the EL-48458. Refer to the removal procedure located in High Voltage System Diagnosis (EL-48458) ().
10. Ignition OFF, disconnect the X1 B+ (300 V) and X2 ground (300 V) cables from the drive motor generator battery.
11. Test for infinite resistance between the terminals listed below and ground
