2010 Cadillac Truck Escalade ESV AWD V8-6.2L Page 1596
Action Taken When the DTC Sets
* DTCs P1B05, P1B06, P1AE2, P1AE3, P1AE4 are Type C DTCs.
* The HPCM commands the BECM to open the high voltage contactor relays when vehicle speed is less than 5 km/h (3 mph) for 6 seconds.
Conditions for Clearing the DTC
DTCs P1B05, P1B06, P1AE2, P1AE3, P1AE4 are Type C DTCs.
Diagnostic Aids
* Test for a fully engaged high voltage manual disconnect lever whenever an open HVIC condition is observed. The manual disconnect lever
must be pressed down fully in order to engage the HVIC terminals.
* The BECM HVIC source and HVIC return circuit current sensors may not measure actual circuit current with the same accuracy. The BECM
HVIC Source parameter may indicate less current than the BECM HVIC Return parameter for this reason. Measuring actual HVIC current
with a DMM may also not compare directly to the parameter display.
* The HVIC detects removal of the following components:
- The drive motor generator control module sight shield
- The transmission 3 phase cable cover
- The high voltage manual disconnect lever
- The hybrid battery terminal extension cover assembly
* The HVIC is also routed through several inline connectors.
* With the ignition in the OFF position, the BECM will source the HVIC current for 5 minutes every time a vehicle door is opened.
Reference Information
Schematic Reference
Hybrid Controls Schematics ()
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
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)
* 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
Circuit/System Verification
Important: The HPCM must command the high voltage contactor relays closed in order for HVIC to be enabled. Fail will be
displayed if any DTCs present at ignition ON prevent the HPCM from closing the high voltage contactor relays.
1. Capture and then clear the DTC information.
2. Ignition OFF, wait 2 minutes.
3. Ignition ON, observe the HPCMs BECM HVIC Status and HPCM HVIC Status parameters.
锟斤拷The parameters should both indicate a PASS condition.
Circuit/System Testing
P1B05 and P1B06 without P1AE2, P1AE3 or P1AE4
Important: DTC P1B05 and P1B06 should always pass and fail together. If one DTC has passed while one has failed, replace the
drive motor generator power inverter control module (PIM).
