2010 Cadillac Truck Escalade ESV AWD V8-6.2L Page 1591
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).
1. Ignition OFF, wait 2 minutes.
Important: The drive motor generator control module sight shield must be installed during all testing in order to complete the HVIC
current loop.
2. Disconnect PIM connector X1.
3. Ignition ON, observe the BECM HVIC Current Source parameter.
锟斤拷If the HVIC Current Source parameter indicates current less than 5 mA, replace the PIM.
锟斤拷If the HVIC Current Source parameter indicates current between 5-18 mA test for the HVIC Source and HVIC Return circuits shorted
together between PIM connector X1 and X350.
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.
Important: Removal of the HV manual disconnect lever also opens the HVIC source circuit between X350 and BECM connector X1.
锟斤拷If the circuit tests normal, perform the High Voltage Disabling () procedure and test for the HVIC Source and HVIC Return circuits
shorted together between X350 and BECM connector X1. If the circuit tests normal, replace the BECM.
P1B05 and P1B06 with P1AE2
Important: DTCs 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).
1. Ignition OFF, wait 2 minutes.
Important: The drive motor generator control module sight shield must be installed during all testing in order to complete the HVIC
current loop.
2. Disconnect PIM connector X1.
3. Install a 3 A fused jumper wire between the HVIC return circuit terminal 1 and the HVIC source circuit terminal 23.
4. Ignition ON, observe the BECM HVIC Source Current parameter.
锟斤拷If the HVIC Source Current parameter indicates current between 5-18 mA, test for proper PIM connector X1 terminal contact at terminal
1 and terminal 23. If the terminal contact tests normal, replace the PIM.
5. Remove the PIM terminal 1 to terminal 23 fused jumper wire.
6. Test for 5-18 mA with a DMM between the HVIC Source circuit terminal 23 and ground.
锟斤拷If within the specified range, test the HVIC Return circuit for an open between PIM connector X1 and X350.
